WO2017197629A1 - Current source inverter system and inverter device - Google Patents

Current source inverter system and inverter device Download PDF

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Publication number
WO2017197629A1
WO2017197629A1 PCT/CN2016/082679 CN2016082679W WO2017197629A1 WO 2017197629 A1 WO2017197629 A1 WO 2017197629A1 CN 2016082679 W CN2016082679 W CN 2016082679W WO 2017197629 A1 WO2017197629 A1 WO 2017197629A1
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WIPO (PCT)
Prior art keywords
port
diode
power switch
switch tube
inductor
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PCT/CN2016/082679
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French (fr)
Chinese (zh)
Inventor
胡炎申
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胡炎申
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Priority to PCT/CN2016/082679 priority Critical patent/WO2017197629A1/en
Priority to CN201680002733.6A priority patent/CN107005059A/en
Publication of WO2017197629A1 publication Critical patent/WO2017197629A1/en

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    • H02J3/383—
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/02—Arrangements for reducing harmonics or ripples
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

Definitions

  • the present invention relates to the field of inverters, and in particular, to a current source inverter system and an inverter device.
  • a photovoltaic power generation system a plurality of photovoltaic modules are connected in series to form a photovoltaic string, and then a plurality of photovoltaic groups are connected in series to form a photovoltaic array.
  • the photovoltaic component converts solar light energy into direct current, and increases voltage and increases current through series and parallel connection of photovoltaic components.
  • the electrical connection function is realized by the combiner box and the power distribution cabinet, and the photovoltaic inverter converts the randomly changed direct current into the alternating current with the same frequency, phase and voltage of the public power grid.
  • the PV inverter has the MPPT (maximum power point tracking) function, which can automatically find the maximum power point of the PV string or the PV array through an internal software algorithm.
  • Typical large-scale desert ground and large-roof solar photovoltaic power plants generally use centralized inverters to form a photovoltaic power generation system, which is mainly composed of solar photovoltaic cell modules, combiner boxes, AC and DC power distribution cabinets and photovoltaic inverters, which can easily realize 10kV/ 35kV medium voltage grid connection, the photovoltaic group is connected in series to obtain higher DC voltage and DC power, and then share a centralized inverter to achieve grid-connected power generation.
  • Distributed photovoltaic power plants are generally built in medium and large industrial and commercial plants, and personal home roofs, mainly using string-type photovoltaic inverters, AC power distribution cabinets, without the need for combiner boxes, DC power distribution cabinets.
  • the development of distributed photovoltaic power generation system has promoted photovoltaic power generation close to the load end and reduced transmission and distribution losses.
  • the centralized inverter constitutes a photovoltaic power generation system or a distributed photovoltaic power station
  • a voltage source type inverter is generally used.
  • the voltage source inverter includes a DC boost inside.
  • Two-stage system with inverter circuit as shown in Figure 1; single-stage system can also be used inside the voltage source inverter, that is, the DC boost circuit is not used, but only the inverter function is retained, but in order to be higher
  • the grid voltage is adapted, and the step-up transformer is required on the AC output side of the inverter, as shown in Figure 2.
  • the two-stage system contains a DC boost circuit, and the single-stage system AC output must be equipped with a step-up transformer. Both of these methods increase the size, weight, price, and power consumption of the inverter.
  • the PV string The principle model is a DC current source, and the conventional voltage source inverter needs to convert the current source of the PV string into a voltage source again.
  • photovoltaic grid-connected power generation requires the output to be a current source. This increases the complexity and reliability of the system structure and control strategy after multiple conversions. Therefore, the voltage source inverter does not meet high efficiency and high efficiency when applied to photovoltaic power generation. Technology development trend of work density and low price.
  • embodiments of the present invention provide a current source inverter system and an inverter device, which are configured to reconfigure the system architecture of the inverter to improve the power generation and work efficiency of the photovoltaic power generation system. At the same time reduce system costs.
  • a DC energy storage circuit a DC energy storage circuit, an inverter bridge arm circuit, an AC filter circuit, and a controller, wherein the DC energy storage circuit is electrically connected to the photovoltaic group, and the DC energy storage circuit is electrically connected to the inverter bridge arm circuit.
  • the inverter bridge arm circuit is electrically connected to the AC filter circuit
  • the controller is electrically connected to the inverter bridge arm circuit
  • the controller is configured to control the operation of the inverter bridge arm circuit;
  • the DC energy storage circuit stores and filters a DC current provided by the PV string to form a stable DC current, and inputs the stable DC current to the inverter bridge circuit, the inverse
  • the variable bridge arm circuit converts the stable direct current into an alternating current and outputs the same to the alternating current filter circuit, and the alternating current filter circuit converts the alternating current into a sinusoidal current, and finally merges into an alternating current grid to realize photovoltaic grid connection. Power generation.
  • controller is specifically configured to implement the power switch tube driving signal based on the sinusoidal pulse width modulation to control the inverter bridge arm circuit to convert the stable DC current input by the DC energy storage circuit into AC current output.
  • FIG. 18 is a schematic diagram showing the wiring of the current source inverter system in an interleaved parallel manner when another single photovoltaic string is provided in the sixteenth embodiment of the present invention
  • the inverter bridge arm circuit includes a second power switch tube S2, a third power switch tube S3, and a fourth power Rate switch tube S4, fifth power switch tube S5, sixth power switch tube S6, seventh power switch tube S7, second diode D2, third diode D3, fourth diode D4, fifth two a diode D5, a sixth diode D6, and a seventh diode D7, wherein the third port of the third power switch S3 and the third diode D3 are connected in parallel, and the fifth power switch S5 a first port connected in parallel with the fifth diode D5 and a first port in which the seventh power switch S7 and the seventh diode D7 are connected in parallel, and the connection node is the first of the inverter bridge circuit a second port in which the second power switch S2 is connected in parallel with the second diode D2, a second port in which the fourth power switch S4 and the fourth diode D4 are connected in parallel, and the sixth The power switch tube S6 is connected to the second port connected in parallel with
  • the AC filter circuit includes a second capacitor Ca, a third capacitor Cb, a fourth capacitor Cc, a second inductor La, a third inductor Lb, and a fourth inductor Lc, wherein the first port of the second capacitor Ca is a first port of the second inductor La is connected, the connection node is a first port of the AC filter circuit; a first port of the third capacitor Cb is connected to a first port of the third inductor Lb, and the connection node is a second port of the AC filter circuit; a first port of the fourth capacitor Cc is connected to a first port of the fourth inductor Lc, and a connection node is a third port of the AC filter circuit;
  • the second port of the inductor La, the second port of the third inductor Lb, and the second port of the fourth inductor Lc are respectively incorporated into a corresponding AC grid.
  • the current source inverter in the embodiment of the present invention is a single-stage three-phase current source inverter with a DC voltage source input, a DC voltage source input provided by a PV string PV or other DC power source, After the capacitor Cin is filtered, the DC voltage source is converted into a DC current source by the inductor Ld of the filtering and energy storage function, and then input to the three-phase inverter bridge composed of the two-level H bridge with a stable DC current, three
  • the phase bridge arm is composed of S2, S3, S4, S5, S6, and S7 power switch tubes, and each bridge arm switch tube does not need a series power diode, which reduces the conduction loss of the inverter.
  • the DC energy storage circuit includes a first capacitor Cin and a first inductor Ld, wherein an input port of the first capacitor Cin is connected to a first port of the PV string PV, and an output port of the first capacitor Cin Connected to the second port of the PV string PV, the first port of the first inductor Ld is connected to the second port of the PV string PV, and the second port of the first inductor Ld is a first port of the inverter bridge arm circuit is connected, and a first port of the PV string PV is connected to a second port of the inverter bridge circuit;
  • FIG. 8 is a schematic diagram of wiring of a current source inverter system according to a sixth embodiment of the present invention.
  • the PV string PV includes N series photovoltaic modules;
  • the DC energy storage circuit includes a first diode Db, a first inductor Lb, an eighth diode Dm, and a switch tube Sb, wherein an input port of the first diode Db and the PV string PV a first port, a first port of the switch Sb, an output port of the first diode Db and a second port of the first inductor Lb, a second port of the switch Sb, An input port of the eighth diode Dm is connected, a first port of the first inductor Lb is connected to a second port of the photovoltaic string PV, and an output port of the eighth diode Dm is a first port of the inverter bridge arm circuit is connected, and a first port of the PV string PV is connected to a second port of the inverter bridge circuit;
  • the DC energy storage circuit includes a first capacitor, a first inductor Lb, a switch transistor, a first diode Db, and an eighth diode Dm, wherein the input port of the first capacitor and the PV string PV The first port is connected, the output port of the first capacitor is connected to the second port of the PV string PV, and the first port of the first inductor Lb is connected to the second port of the PV string PV a second port of the first inductor Lb and a second port of the switch tube, and the first diode Db
  • An output port of the eighth diode Dm is connected to the output port, and an output port of the eighth diode Dm is connected to the first port of the inverter bridge circuit, and the first port of the switch tube Connected to the input port of the first diode Db, the first port of the PV string PV, and the first port of the PV string PV is connected to the second port of the inverter bridge circuit;
  • the inverter bridge arm circuit includes a second power switch tube S2, a third power switch tube S3, a fourth power switch tube S4, a fifth power switch tube S5, a sixth power switch tube S6, and a seventh power switch tube S7.
  • FIG. 16 is a schematic diagram showing the interleaving and parallel connection of a current source inverter system in another single photovoltaic string according to the fourteenth embodiment of the present invention.
  • a single photovoltaic string current source is shown.
  • the input three-phase current source photovoltaic grid-connected inverter is composed of n single-stage three-phase current source inverter circuits, and uses the same set of total AC filter circuit, MCU software control and phase shift modulation strategy to complete the photovoltaic Grid-connected power generation and interleaved parallel function.
  • This interleaved parallel mode reduces input and output current ripple, and also enables multi-level operation of the output, thereby further reducing magnetic device losses and improving system efficiency.
  • the current source input can be changed to a voltage source input, and the three-phase inverter can also be changed to a single-phase inverter with similar system functions and performance.
  • FIG. 17 is a schematic diagram showing the interleaving and parallel connection of a current source inverter system according to another fifteenth embodiment of the present invention, as shown in FIG. 17, a single photovoltaic string current source.
  • the input three-phase current source photovoltaic grid-connected inverter is composed of n two-stage three-phase current source inverter and corresponding AC filter circuit, and the two-stage three-phase current source inverter is composed of DC Boost boost converter. It is composed of DC/AC inverter circuit and adopts the same MCU software control and phase shift modulation strategy. Thereby completing photovoltaic grid-connected power generation and staggered parallel function.
  • FIG. 18 is a schematic diagram of the staggered parallel connection of the current source inverter system in the case of another single photovoltaic string according to the sixteenth embodiment of the present invention.
  • a single photovoltaic string current source is shown.
  • the input three-phase current source photovoltaic grid-connected inverter is composed of n DC Boost boost converters, and the same set of single-stage three-phase current source inverter and AC filter circuit, and uses the same set of MCU software to control and shift. Phase modulation strategy to complete photovoltaic grid-connected power generation and interleaved parallel function.
  • This staggered parallel approach reduces input current ripple, which reduces magnetic device losses and increases system efficiency.
  • the current source input can be changed to a voltage source input, and the three-phase inverter can also be changed to a single-phase inverter with similar system functions and performance.
  • FIG. 19 is a schematic diagram of the wiring structure of the coupled inductor structure of the current source inverter system according to the seventeenth embodiment of the present invention.
  • a single photovoltaic string current source is input when the three-phase current source is photovoltaic.
  • the network inverter is composed of n single-stage three-phase current source inverters and corresponding AC filter circuits, and adopts the same MCU software control and phase shift modulation strategy, and at the same time, n DC energy storage inductors and AC filter inductors.
  • the coupled inductor structure is used to complete photovoltaic grid-connected power generation and interleaved parallel and coupled inductor functions.

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Abstract

A current source inverter system (100) and an inverter device comprising the system. The current source inverter system (100) comprises: a direct current energy storage circuit (110), an inverter bridge arm circuit (120), an alternating current filtering circuit (130), and a controller (140); the direct current energy storage circuit (110) is electrically connected to serial photovoltaic modules; the direct current energy storage circuit (110) is electrically connected to the inverter bridge arm circuit (120); the inverter bridge arm circuit (120) is electrically connected to the alternating current filtering circuit (130); the controller (140) is electrically connected to the inverter bridge arm circuit (120); the controller (140) is specifically used for controlling a three-phase current source inverter system (100) so that at any moment only one-phase bridge arm operates at a high frequency while the other two-phase bridge arms operate at a low frequency, thereby converting a stable direct current inputted by the direct current energy storage circuit (110) into an alternating current for output. By re-constructing system architecture for a photovoltaic inverter in photovoltaic power generation technology, the current source inverter system (100) improves the amount of power generation and operation efficiency of the photovoltaic power generation system while reducing system costs.

Description

一种电流源逆变器***及逆变装置Current source inverter system and inverter device 技术领域Technical field
本发明涉及逆变器领域，尤其涉及一种电流源逆变器***及逆变装置。The present invention relates to the field of inverters, and in particular, to a current source inverter system and an inverter device.
背景技术Background technique
光伏发电***中，多个光伏组件串联构成光伏组串，再由多个光伏组串并联构成光伏阵列，光伏组件把太阳的光能转换为直流电，通过光伏组件的串并联提高电压、增大电流，汇流箱、配电柜等实现电气连接功能，光伏逆变器把这种随机变化的直流电转换为与公用电网频率、相位、电压均相同的交流电。同时，光伏逆变器具有MPPT(maximum power point tracking，最大功率点跟踪)功能，可以通过内部软件算法自动寻找光伏组串、或光伏阵列的最大功率点。In a photovoltaic power generation system, a plurality of photovoltaic modules are connected in series to form a photovoltaic string, and then a plurality of photovoltaic groups are connected in series to form a photovoltaic array. The photovoltaic component converts solar light energy into direct current, and increases voltage and increases current through series and parallel connection of photovoltaic components. The electrical connection function is realized by the combiner box and the power distribution cabinet, and the photovoltaic inverter converts the randomly changed direct current into the alternating current with the same frequency, phase and voltage of the public power grid. At the same time, the PV inverter has the MPPT (maximum power point tracking) function, which can automatically find the maximum power point of the PV string or the PV array through an internal software algorithm.
典型大型荒漠地面及大型屋顶的太阳能光伏电站一般采用集中式逆变器构成光伏发电***，主要由太阳能光伏电池组件、汇流箱、交直流配电柜及光伏逆变器组成，可以方便实现10kV/35kV中压并网，光伏组串并联后得到较高的直流电压与直流功率，然后共用一台集中型逆变器实现并网发电。分布式光伏电站一般建在中、大型工商业厂房、及个人家庭屋顶，主要使用组串式光伏逆变器、交流配电柜，而无需汇流箱、直流配电柜。分布式光伏发电***的发展促使光伏发电靠近负载端、减小输配电损耗。Typical large-scale desert ground and large-roof solar photovoltaic power plants generally use centralized inverters to form a photovoltaic power generation system, which is mainly composed of solar photovoltaic cell modules, combiner boxes, AC and DC power distribution cabinets and photovoltaic inverters, which can easily realize 10kV/ 35kV medium voltage grid connection, the photovoltaic group is connected in series to obtain higher DC voltage and DC power, and then share a centralized inverter to achieve grid-connected power generation. Distributed photovoltaic power plants are generally built in medium and large industrial and commercial plants, and personal home roofs, mainly using string-type photovoltaic inverters, AC power distribution cabinets, without the need for combiner boxes, DC power distribution cabinets. The development of distributed photovoltaic power generation system has promoted photovoltaic power generation close to the load end and reduced transmission and distribution losses.
但无论是集中式逆变器构成光伏发电***还是分布式光伏电站，一般均使用电压源型逆变器，在光伏组串电压较低的情况下，电压源逆变器内部包含有直流升压与逆变电路两级式***，如图1所示；电压源逆变器内部也可采用单级式***，即不使用直流升压电路、而只保留逆变功能，但为了与较高的电网电压相适配，逆变器交流输出侧需要使用升压变压器，如图2所示。两级式***内含直流升压电路，单级式***交流输出必须配置升压变压器，这两种方式都增大了逆变器的体积、重量、价格、功耗，同时，光伏组串的原理模型为直流电流源，而传统电压源逆变器需要把光伏组串的电流源再一次转换为电压源， 但是光伏并网发电要求输出必须为电流源，这样经过多次转换从而增大了***结构与控制策略的复杂性、可靠性，因此电压源逆变器应用于光伏发电时不符合高效率、高功密度、低价格的技术发展趋势。However, whether the centralized inverter constitutes a photovoltaic power generation system or a distributed photovoltaic power station, a voltage source type inverter is generally used. In the case of a low voltage of the photovoltaic string, the voltage source inverter includes a DC boost inside. Two-stage system with inverter circuit, as shown in Figure 1; single-stage system can also be used inside the voltage source inverter, that is, the DC boost circuit is not used, but only the inverter function is retained, but in order to be higher The grid voltage is adapted, and the step-up transformer is required on the AC output side of the inverter, as shown in Figure 2. The two-stage system contains a DC boost circuit, and the single-stage system AC output must be equipped with a step-up transformer. Both of these methods increase the size, weight, price, and power consumption of the inverter. At the same time, the PV string The principle model is a DC current source, and the conventional voltage source inverter needs to convert the current source of the PV string into a voltage source again. However, photovoltaic grid-connected power generation requires the output to be a current source. This increases the complexity and reliability of the system structure and control strategy after multiple conversions. Therefore, the voltage source inverter does not meet high efficiency and high efficiency when applied to photovoltaic power generation. Technology development trend of work density and low price.
发明内容Summary of the invention
鉴于现有技术中存在的上述问题，本发明实施例提供一种电流源逆变器***及逆变装置，通过重新构造逆变器的***架构，以期提升光伏发电***的发电量和工作效率，同时降低***成本。In view of the above problems in the prior art, embodiments of the present invention provide a current source inverter system and an inverter device, which are configured to reconfigure the system architecture of the inverter to improve the power generation and work efficiency of the photovoltaic power generation system. At the same time reduce system costs.
本发明实施例第一方面提供一种电流源逆变器***，包括：A first aspect of the embodiments of the present invention provides a current source inverter system, including:
直流储能电路、逆变桥臂电路、交流滤波电路、控制器，其中，所述直流储能电路与光伏组串电连接，所述直流储能电路与所述逆变桥臂电路电连接，所述逆变桥臂电路与所述交流滤波电路电连接，所述控制器与所述逆变桥臂电路电连接，所述控制器用于控制所述逆变桥臂电路的工作；a DC energy storage circuit, an inverter bridge arm circuit, an AC filter circuit, and a controller, wherein the DC energy storage circuit is electrically connected to the photovoltaic group, and the DC energy storage circuit is electrically connected to the inverter bridge arm circuit. The inverter bridge arm circuit is electrically connected to the AC filter circuit, the controller is electrically connected to the inverter bridge arm circuit, and the controller is configured to control the operation of the inverter bridge arm circuit;
其中，所述直流储能电路将所述光伏组串提供的直流电流进行储能、滤波形成稳定的直流电流，并将所述稳定的直流电流输入给所述逆变桥臂电路，所述逆变桥臂电路将所述稳定的直流电流转换为交流电流、并输出给所述交流滤波电路，所述交流滤波电路将所述交流电流转换为正弦波电流，最终并入交流电网实现光伏并网发电。The DC energy storage circuit stores and filters a DC current provided by the PV string to form a stable DC current, and inputs the stable DC current to the inverter bridge circuit, the inverse The variable bridge arm circuit converts the stable direct current into an alternating current and outputs the same to the alternating current filter circuit, and the alternating current filter circuit converts the alternating current into a sinusoidal current, and finally merges into an alternating current grid to realize photovoltaic grid connection. Power generation.
进一步可选的，所述控制器具体用于实现基于正弦脉宽调制得到的功率开关管驱动信号控制所述逆变桥臂电路，以将由所述直流储能电路输入的稳定的直流电流转换为交流电流输出。Further optionally, the controller is specifically configured to implement the power switch tube driving signal based on the sinusoidal pulse width modulation to control the inverter bridge arm circuit to convert the stable DC current input by the DC energy storage circuit into AC current output.
进一步可选的，所述光伏组串包括N个串联的光伏组件；Further optionally, the photovoltaic string comprises N serially connected photovoltaic components;
所述直流储能电路包括第一二极管和第一电感，其中，所述第一二极管的输入端口与所述光伏组串的第一端口连接，所述第一二极管的输出端口与所述光伏组串的第二端口连接，所述第一电感的的第一端口与所述光伏组串的第二端口连接，所述第一电感的的第二端口与所述逆变桥臂电路的第一端口连接，所述光伏组串的第一端口与所述逆变桥臂电路的第二端口连接；The DC energy storage circuit includes a first diode and a first inductor, wherein an input port of the first diode is connected to a first port of the photovoltaic string, and an output of the first diode a port is connected to the second port of the PV string, a first port of the first inductor is connected to a second port of the PV string, and a second port of the first inductor is connected to the inverter a first port of the bridge arm circuit is connected, and a first port of the PV string is connected to a second port of the inverter bridge circuit;
所述逆变桥臂电路包括第二功率开关管、第三功率开关管、第四功率开关 管、第五功率开关管、第六功率开关管、第七功率开关管、第二二极管、第三二极管、第四二极管、第五二极管、第六二极管、第七二极管，其中，所述第三功率开关管与第三二极管并联连接的第一端口、所述第五功率开关管与第五二极管并联连接的第一端口及所述第七功率开关管与第七二极管并联连接的第一端口连接，连接节点为所述逆变桥臂电路的第一端口；所述第二功率开关管与第二二极管并联连接的第二端口、所述第四功率开关管与第四二极管并联连接的第二端口及所述第六功率开关管与第六二极管并联连接的第二端口连接，连接节点为所述逆变桥臂电路的第二端口；The inverter bridge arm circuit includes a second power switch tube, a third power switch tube, and a fourth power switch a tube, a fifth power switch tube, a sixth power switch tube, a seventh power switch tube, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode, wherein the third port in which the third power switch is connected in parallel with the third diode, the first port in which the fifth power switch is connected in parallel with the fifth diode, and the The seventh power switch tube is connected to the first port connected in parallel with the seventh diode, the connection node is the first port of the inverter bridge arm circuit; the second power switch tube is connected in parallel with the second diode a second port, a second port in which the fourth power switch tube is connected in parallel with the fourth diode, and a second port in which the sixth power switch tube is connected in parallel with the sixth diode, and the connection node is the a second port of the inverter bridge arm circuit;
所述第二功率开关管与第二二极管并联连接的第一端口与所述第三功率开关管与第三二极管并联连接的第二端口、所述交流滤波电路的第一端口连接；所述第四功率开关管与第四二极管并联连接的第一端口与所述第五功率开关管与第五二极管并联连接的第二端口、所述交流滤波电路的第二端口连接；所述第六功率开关管与第六二极管并联连接的第一端口与所述第七功率开关管与第七二极管并联连接的第二端口、所述交流滤波电路的第三端口连接；a first port in parallel connection between the second power switch tube and the second diode is connected to a second port in which the third power switch tube is connected in parallel with the third diode, and a first port of the AC filter circuit is connected a first port in parallel connection of the fourth power switch tube and the fourth diode, a second port connected in parallel with the fifth power switch tube and the fifth diode, and a second port of the AC filter circuit a second port in which the sixth power switch tube is connected in parallel with the sixth diode and a second port in which the seventh power switch tube and the seventh diode are connected in parallel, and a third port of the AC filter circuit Port connection
所述交流滤波电路包括第二电容、第三电容、第四电容、第二电感、第三电感、第四电感，其中，所述第二电容的第一端口与所述第二电感的第一端口连接，连接节点为所述交流滤波电路的第一端口；所述第三电容的第一端口与所述第三电感的第一端口连接，连接节点为所述交流滤波电路的第二端口；所述第四电容的第一端口与所述第四电感的第一端口连接，连接节点为所述交流滤波电路的第三端口；所述第二电感的第二端口、第三电感的第二端口、第四电感的第二端口分别并入相应的交流电网。The AC filter circuit includes a second capacitor, a third capacitor, a fourth capacitor, a second inductor, a third inductor, and a fourth inductor, wherein the first port of the second capacitor and the first of the second inductor a port is connected, the connection node is a first port of the AC filter circuit; a first port of the third capacitor is connected to a first port of the third inductor, and a connection node is a second port of the AC filter circuit; The first port of the fourth capacitor is connected to the first port of the fourth inductor, the connection node is the third port of the AC filter circuit, the second port of the second inductor, and the second port of the third inductor The port, the second port of the fourth inductor is respectively incorporated into the corresponding AC grid.
进一步可选的，所述光伏组串包括N个串联的光伏组件；Further optionally, the photovoltaic string comprises N serially connected photovoltaic components;
所述直流储能电路包括第一电容和第一电感，其中，所述第一电容的输入端口与所述光伏组串的第一端口连接，所述第一电容的输出端口与所述光伏组串的第二端口连接，所述第一电感的的第一端口与所述光伏组串的第二端口连接，所述第一电感的的第二端口与所述逆变桥臂电路的第一端口连接，所述光伏组串的第一端口与所述逆变桥臂电路的第二端口连接；The DC energy storage circuit includes a first capacitor and a first inductor, wherein an input port of the first capacitor is connected to a first port of the PV string, an output port of the first capacitor and the PV group a second port of the string is connected, a first port of the first inductor is connected to a second port of the photovoltaic string, a second port of the first inductor is first with a first circuit of the inverter bridge circuit a port connection, a first port of the photovoltaic string is connected to a second port of the inverter bridge circuit;
所述逆变桥臂电路包括第二功率开关管、第三功率开关管、第四功率开关 管、第五功率开关管、第六功率开关管、第七功率开关管、第二二极管、第三二极管、第四二极管、第五二极管、第六二极管、第七二极管，其中，所述第三功率开关管与第三二极管并联连接的第一端口、所述第五功率开关管与第五二极管并联连接的第一端口及所述第七功率开关管与第七二极管并联连接的第一端口连接，连接节点为所述逆变桥臂电路的第一端口；所述第二功率开关管与第二二极管并联连接的第二端口、所述第四功率开关管与第四二极管并联连接的第二端口及所述第六功率开关管与第六二极管并联连接的第二端口连接，连接节点为所述逆变桥臂电路的第二端口；The inverter bridge arm circuit includes a second power switch tube, a third power switch tube, and a fourth power switch a tube, a fifth power switch tube, a sixth power switch tube, a seventh power switch tube, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode, wherein the third port in which the third power switch is connected in parallel with the third diode, the first port in which the fifth power switch is connected in parallel with the fifth diode, and the The seventh power switch tube is connected to the first port connected in parallel with the seventh diode, the connection node is the first port of the inverter bridge arm circuit; the second power switch tube is connected in parallel with the second diode a second port, a second port in which the fourth power switch tube is connected in parallel with the fourth diode, and a second port in which the sixth power switch tube is connected in parallel with the sixth diode, and the connection node is the a second port of the inverter bridge arm circuit;
所述第二功率开关管与第二二极管并联连接的第一端口与所述第三功率开关管与第三二极管并联连接的第二端口、所述交流滤波电路的第一端口连接；所述第四功率开关管与第四二极管并联连接的第一端口与所述第五功率开关管与第五二极管并联连接的第二端口、所述交流滤波电路的第二端口连接；所述第六功率开关管与第六二极管并联连接的第一端口与所述第七功率开关管与第七二极管并联连接的第二端口、所述交流滤波电路的第三端口连接；a first port in parallel connection between the second power switch tube and the second diode is connected to a second port in which the third power switch tube is connected in parallel with the third diode, and a first port of the AC filter circuit is connected a first port in parallel connection of the fourth power switch tube and the fourth diode, a second port connected in parallel with the fifth power switch tube and the fifth diode, and a second port of the AC filter circuit a second port in which the sixth power switch tube is connected in parallel with the sixth diode and a second port in which the seventh power switch tube and the seventh diode are connected in parallel, and a third port of the AC filter circuit Port connection
所述交流滤波电路包括第二电容、第三电容、第四电容、第二电感、第三电感、第四电感，其中，所述第二电容的第一端口与所述第二电感的第一端口连接，连接节点为所述交流滤波电路的第一端口；所述第三电容的第一端口与所述第三电感的第一端口连接，连接节点为所述交流滤波电路的第二端口；所述第四电容的第一端口与所述第四电感的第一端口连接，连接节点为所述交流滤波电路的第三端口；所述第二电感的第二端口、第三电感的第二端口、第四电感的第二端口分别并入相应的交流电网。The AC filter circuit includes a second capacitor, a third capacitor, a fourth capacitor, a second inductor, a third inductor, and a fourth inductor, wherein the first port of the second capacitor and the first of the second inductor a port is connected, the connection node is a first port of the AC filter circuit; a first port of the third capacitor is connected to a first port of the third inductor, and a connection node is a second port of the AC filter circuit; The first port of the fourth capacitor is connected to the first port of the fourth inductor, the connection node is the third port of the AC filter circuit, the second port of the second inductor, and the second port of the third inductor The port, the second port of the fourth inductor is respectively incorporated into the corresponding AC grid.
进一步可选的，所述光伏组串包括N个串联的光伏组件；Further optionally, the photovoltaic string comprises N serially connected photovoltaic components;
所述直流储能电路包括第一二极管和第一电感，其中，所述第一二极管的输入端口与所述光伏组串的第一端口连接，所述第一二极管的输出端口与所述光伏组串的第二端口连接，所述第一电感的的第一端口与所述光伏组串的第二端口连接，所述第一电感的的第二端口与所述逆变桥臂电路的第一端口连接，所述光伏组串的第一端口与所述逆变桥臂电路的第二端口连接；The DC energy storage circuit includes a first diode and a first inductor, wherein an input port of the first diode is connected to a first port of the photovoltaic string, and an output of the first diode a port is connected to the second port of the PV string, a first port of the first inductor is connected to a second port of the PV string, and a second port of the first inductor is connected to the inverter a first port of the bridge arm circuit is connected, and a first port of the PV string is connected to a second port of the inverter bridge circuit;
所述逆变桥臂电路包括第二功率开关管、第三功率开关管、第四功率开关 管、第五功率开关管、第二二极管、第三二极管、第四二极管、第五二极管，其中，所述第二功率开关管与第二二极管并联连接的第二端口与所述第四功率开关管与第四二极管并联连接的第二端口连接，连接节点为所述逆变桥臂电路的第二端口；所述第三功率开关管与第三二极管并联连接的第一端口与所述第五功率开关管与第五二极管并联连接的第一端口连接，连接节点为所述逆变桥臂电路的第一端口；The inverter bridge arm circuit includes a second power switch tube, a third power switch tube, and a fourth power switch a second power switch tube, a second diode, a third diode, a fourth diode, and a fifth diode, wherein the second power switch tube is connected in parallel with the second diode The second port is connected to the second port in which the fourth power switch tube and the fourth diode are connected in parallel, and the connection node is the second port of the inverter bridge arm circuit; the third power switch tube and the third port a first port in which the diodes are connected in parallel is connected to a first port in which the fifth power switch tube and the fifth diode are connected in parallel, and the connection node is a first port of the inverter bridge arm circuit;
所述第二功率开关管与第二二极管并联连接的第一端口与所述第三功率开关管与第三二极管并联连接的第二端口、所述交流滤波电路的第一端口连接；所述第四功率开关管与第四二极管并联连接的第一端口与所述第五功率开关管与第五二极管并联连接的第二端口、所述交流滤波电路的第二端口连接；a first port in parallel connection between the second power switch tube and the second diode is connected to a second port in which the third power switch tube is connected in parallel with the third diode, and a first port of the AC filter circuit is connected a first port in parallel connection of the fourth power switch tube and the fourth diode, a second port connected in parallel with the fifth power switch tube and the fifth diode, and a second port of the AC filter circuit connection;
所述交流滤波电路包括第二电容、第二电感、第三电感，其中，所述第二电容的第一端口与所述第二电感的第一端口连接，连接节点为所述交流滤波电路的第一端口；所述第二电容的第二端口与所述第三电感的第一端口连接，连接节点为所述交流滤波电路的第二端口；所述第二电感的第二端口、第三电感的第二端口连接所述交流电网。The AC filter circuit includes a second capacitor, a second inductor, and a third inductor, wherein the first port of the second capacitor is connected to the first port of the second inductor, and the connection node is the AC filter circuit a first port; a second port of the second capacitor is connected to the first port of the third inductor, the connection node is a second port of the AC filter circuit; and a second port and a third port of the second inductor A second port of the inductor is coupled to the AC grid.
进一步可选的，所述光伏组串包括N个串联的光伏组件；Further optionally, the photovoltaic string comprises N serially connected photovoltaic components;
所述直流储能电路包括第一电容和第一电感，其中，所述第一电容的输入端口与所述光伏组串的第一端口连接，所述第一电容的输出端口与所述光伏组串的第二端口连接，所述第一电感的的第一端口与所述光伏组串的第二端口连接，所述第一电感的的第二端口与所述逆变桥臂电路的第一端口连接，所述光伏组串的第一端口与所述逆变桥臂电路的第二端口连接；The DC energy storage circuit includes a first capacitor and a first inductor, wherein an input port of the first capacitor is connected to a first port of the PV string, an output port of the first capacitor and the PV group a second port of the string is connected, a first port of the first inductor is connected to a second port of the photovoltaic string, a second port of the first inductor is first with a first circuit of the inverter bridge circuit a port connection, a first port of the photovoltaic string is connected to a second port of the inverter bridge circuit;
所述逆变桥臂电路包括第二功率开关管、第三功率开关管、第四功率开关管、第五功率开关管、第二二极管、第三二极管、第四二极管、第五二极管，其中，所述第二功率开关管与第二二极管并联连接的第二端口与所述第四功率开关管与第四二极管并联连接的第二端口连接，连接节点为所述逆变桥臂电路的第二端口；所述第三功率开关管与第三二极管并联连接的第一端口与所述第五功率开关管与第五二极管并联连接的第一端口连接，连接节点为所述逆变桥臂电路的第一端口； The inverter bridge arm circuit includes a second power switch tube, a third power switch tube, a fourth power switch tube, a fifth power switch tube, a second diode, a third diode, a fourth diode, a fifth diode, wherein the second port in which the second power switch tube is connected in parallel with the second diode is connected to the second port in which the fourth power switch tube and the fourth diode are connected in parallel, and is connected a node is a second port of the inverter bridge arm circuit; a first port in which the third power switch tube is connected in parallel with the third diode is connected in parallel with the fifth power switch tube and the fifth diode a first port connected, the connection node being a first port of the inverter bridge arm circuit;
所述第二功率开关管与第二二极管并联连接的第一端口与所述第三功率开关管与第三二极管并联连接的第二端口、所述交流滤波电路的第一端口连接；所述第四功率开关管与第四二极管并联连接的第一端口与所述第五功率开关管与第五二极管并联连接的第二端口、所述交流滤波电路的第二端口连接；a first port in parallel connection between the second power switch tube and the second diode is connected to a second port in which the third power switch tube is connected in parallel with the third diode, and a first port of the AC filter circuit is connected a first port in parallel connection of the fourth power switch tube and the fourth diode, a second port connected in parallel with the fifth power switch tube and the fifth diode, and a second port of the AC filter circuit connection;
所述交流滤波电路包括第二电容、第二电感、第三电感，其中，所述第二电容的第一端口与所述第二电感的第一端口连接，连接节点为所述交流滤波电路的第一端口；所述第二电容的第二端口与所述第三电感的第一端口连接，连接节点为所述交流滤波电路的第二端口；所述第二电感的第二端口、第三电感的第二端口连接所述交流电网。The AC filter circuit includes a second capacitor, a second inductor, and a third inductor, wherein the first port of the second capacitor is connected to the first port of the second inductor, and the connection node is the AC filter circuit a first port; a second port of the second capacitor is connected to the first port of the third inductor, the connection node is a second port of the AC filter circuit; and a second port and a third port of the second inductor A second port of the inductor is coupled to the AC grid.
进一步可选的，所述光伏组串包括N个串联的光伏组件；Further optionally, the photovoltaic string comprises N serially connected photovoltaic components;
所述直流储能电路包括第一二极管、第一电感、第八二极管、开关管，其中，所述第一二极管的输入端口与所述光伏组串的第一端口、所述开关管的第一端口连接，所述第一二极管的输出端口与所述第一电感的的第二端口、所述开关的第二端口、所述第八二极管的输入端口连接，所述第一电感的的第一端口与所述所光伏组串的第二端口连接，所述第八二极管的输出端口与所述逆变桥臂电路的第一端口连接，所述光伏组串的第一端口与所述逆变桥臂电路的第二端口连接；The DC energy storage circuit includes a first diode, a first inductor, an eighth diode, and a switch tube, wherein an input port of the first diode and a first port of the photovoltaic string Connecting the first port of the switch tube, the output port of the first diode is connected to the second port of the first inductor, the second port of the switch, and the input port of the eighth diode a first port of the first inductor is connected to a second port of the photovoltaic string, and an output port of the eighth diode is connected to a first port of the inverter bridge circuit, a first port of the photovoltaic string is connected to a second port of the inverter bridge circuit;
所述逆变桥臂电路包括第二功率开关管、第三功率开关管、第四功率开关管、第五功率开关管、第六功率开关管、第七功率开关管、第二二极管、第三二极管、第四二极管、第五二极管、第六二极管、第七二极管，其中，所述第三功率开关管与第三二极管并联连接的第一端口、所述第五功率开关管与第五二极管并联连接的第一端口及所述第七功率开关管与第七二极管并联连接的第一端口连接，连接节点为所述逆变桥臂电路的第一端口；所述第二功率开关管与第二二极管并联连接的第二端口、所述第四功率开关管与第四二极管并联连接的第二端口及所述第六功率开关管与第六二极管并联连接的第二端口连接，连接节点为所述逆变桥臂电路的第二端口；The inverter bridge arm circuit includes a second power switch tube, a third power switch tube, a fourth power switch tube, a fifth power switch tube, a sixth power switch tube, a seventh power switch tube, and a second diode. a third diode, a fourth diode, a fifth diode, a sixth diode, and a seventh diode, wherein the third power switch tube is connected in parallel with the third diode a port, a first port in which the fifth power switch tube and the fifth diode are connected in parallel, and a first port in which the seventh power switch tube is connected in parallel with the seventh diode, and the connection node is the inverter a first port of the bridge arm circuit; a second port in which the second power switch tube is connected in parallel with the second diode; a second port in which the fourth power switch tube and the fourth diode are connected in parallel, and the The sixth power switch tube is connected to the second port connected in parallel with the sixth diode, and the connection node is the second port of the inverter bridge arm circuit;
所述第二功率开关管与第二二极管并联连接的第一端口与所述第三功率开关管与第三二极管并联连接的第二端口、所述交流滤波电路的第一端口连接； 所述第四功率开关管与第四二极管并联连接的第一端口与所述第五功率开关管与第五二极管并联连接的第二端口、所述交流滤波电路的第二端口连接；所述第六功率开关管与第六二极管并联连接的第一端口与所述第七功率开关管与第七二极管并联连接的第二端口、所述交流滤波电路的第三端口连接；a first port in parallel connection between the second power switch tube and the second diode is connected to a second port in which the third power switch tube is connected in parallel with the third diode, and a first port of the AC filter circuit is connected ; a first port in which the fourth power switch tube is connected in parallel with the fourth diode is connected to a second port in which the fifth power switch tube is connected in parallel with the fifth diode, and a second port of the AC filter circuit is connected a second port in which the sixth power switch tube is connected in parallel with the sixth diode and a second port in which the seventh power switch tube and the seventh diode are connected in parallel, and a third port of the AC filter circuit connection;
所述交流滤波电路包括第二电容、第三电容、第四电容、第二电感、第三电感、第四电感，其中，所述第二电容的第一端口与所述第二电感的第一端口连接，连接节点为所述交流滤波电路的第一端口；所述第三电容的第一端口与所述第三电感的第一端口连接，连接节点为所述交流滤波电路的第二端口；所述第四电容的第一端口与所述第四电感的第一端口连接，连接节点为所述交流滤波电路的第三端口；所述第二电感的第二端口、第三电感的第二端口、第四电感的第二端口分别并入相应的交流电网。The AC filter circuit includes a second capacitor, a third capacitor, a fourth capacitor, a second inductor, a third inductor, and a fourth inductor, wherein the first port of the second capacitor and the first of the second inductor a port is connected, the connection node is a first port of the AC filter circuit; a first port of the third capacitor is connected to a first port of the third inductor, and a connection node is a second port of the AC filter circuit; The first port of the fourth capacitor is connected to the first port of the fourth inductor, the connection node is the third port of the AC filter circuit, the second port of the second inductor, and the second port of the third inductor The port, the second port of the fourth inductor is respectively incorporated into the corresponding AC grid.
进一步可选的，所述光伏组串包括N个串联的光伏组件；Further optionally, the photovoltaic string comprises N serially connected photovoltaic components;
所述直流储能电路包括第一电容、第一电感、开关管、第一二极管以及第八二极管，其中，所述第一电容的输入端口与所述光伏组串的第一端口连接，所述第一电容的输出端口与所述光伏组串的第二端口连接，所述第一电感的的第一端口与所述光伏组串的第二端口连接，所述第一电感的的第二端口与所述开关管的第二端口、所述第一二极管的输出端口、所述第八二极管的输入端口连接，所述第八二极管的输出端口连接与所述逆变桥臂电路的第一端口连接，所述开关管的第一端口与所述第一二极管的输入端口、所述光伏组串的第一端口连接，所述光伏组串的第一端口与所述逆变桥臂电路的第二端口连接；The DC energy storage circuit includes a first capacitor, a first inductor, a switch tube, a first diode, and an eighth diode, wherein an input port of the first capacitor and a first port of the PV string Connecting, the output port of the first capacitor is connected to the second port of the PV string, and the first port of the first inductor is connected to the second port of the PV string, the first inductor The second port is connected to the second port of the switch tube, the output port of the first diode, the input port of the eighth diode, and the output port of the eighth diode is connected a first port connection of the inverter bridge arm circuit, a first port of the switch tube is connected to an input port of the first diode, a first port of the PV string, and a a port is connected to the second port of the inverter bridge arm circuit;
所述逆变桥臂电路包括第二功率开关管、第三功率开关管、第四功率开关管、第五功率开关管、第六功率开关管、第七功率开关管、第二二极管、第三二极管、第四二极管、第五二极管、第六二极管、第七二极管，其中，所述第三功率开关管与第三二极管并联连接的第一端口、所述第五功率开关管与第五二极管并联连接的第一端口及所述第七功率开关管与第七二极管并联连接的第一端口连接，连接节点为所述逆变桥臂电路的第一端口；所述第二功率开关管与第二二极管并联连接的第二端口、所述第四功率开关管与第四二极管并联连接的第二端口及所述第六功率开关管与第六二极管并联连接的第二端口连 接，连接节点为所述逆变桥臂电路的第二端口；The inverter bridge arm circuit includes a second power switch tube, a third power switch tube, a fourth power switch tube, a fifth power switch tube, a sixth power switch tube, a seventh power switch tube, and a second diode. a third diode, a fourth diode, a fifth diode, a sixth diode, and a seventh diode, wherein the third power switch tube is connected in parallel with the third diode a port, a first port in which the fifth power switch tube and the fifth diode are connected in parallel, and a first port in which the seventh power switch tube is connected in parallel with the seventh diode, and the connection node is the inverter a first port of the bridge arm circuit; a second port in which the second power switch tube is connected in parallel with the second diode; a second port in which the fourth power switch tube and the fourth diode are connected in parallel, and the a sixth port of the sixth power switch connected in parallel with the sixth diode Connected, the connection node is a second port of the inverter bridge arm circuit;
所述第二功率开关管与第二二极管并联连接的第一端口与所述第三功率开关管与第三二极管并联连接的第二端口、所述交流滤波电路的第一端口连接；所述第四功率开关管与第四二极管并联连接的第一端口与所述第五功率开关管与第五二极管并联连接的第二端口、所述交流滤波电路的第二端口连接；所述第六功率开关管与第六二极管并联连接的第一端口与所述第七功率开关管与第七二极管并联连接的第二端口、所述交流滤波电路的第三端口连接；a first port in parallel connection between the second power switch tube and the second diode is connected to a second port in which the third power switch tube is connected in parallel with the third diode, and a first port of the AC filter circuit is connected a first port in parallel connection of the fourth power switch tube and the fourth diode, a second port connected in parallel with the fifth power switch tube and the fifth diode, and a second port of the AC filter circuit a second port in which the sixth power switch tube is connected in parallel with the sixth diode and a second port in which the seventh power switch tube and the seventh diode are connected in parallel, and a third port of the AC filter circuit Port connection
所述交流滤波电路包括第二电容、第三电容、第四电容、第二电感、第三电感、第四电感，其中，所述第二电容的第一端口与所述第二电感的第一端口连接，连接节点为所述交流滤波电路的第一端口；所述第三电容的第一端口与所述第三电感的第一端口连接，连接节点为所述交流滤波电路的第二端口；所述第四电容的第一端口与所述第四电感的第一端口连接，连接节点为所述交流滤波电路的第三端口；所述第二电感的第二端口、第三电感的第二端口、第四电感的第二端口分别并入相应的交流电网。The AC filter circuit includes a second capacitor, a third capacitor, a fourth capacitor, a second inductor, a third inductor, and a fourth inductor, wherein the first port of the second capacitor and the first of the second inductor a port is connected, the connection node is a first port of the AC filter circuit; a first port of the third capacitor is connected to a first port of the third inductor, and a connection node is a second port of the AC filter circuit; The first port of the fourth capacitor is connected to the first port of the fourth inductor, the connection node is the third port of the AC filter circuit, the second port of the second inductor, and the second port of the third inductor The port, the second port of the fourth inductor is respectively incorporated into the corresponding AC grid.
进一步可选的，所述控制器具体用于控制所述电流源逆变器***中所述逆变桥臂电路的功率开关管采用120°轮换导通工作模式，任意桥臂上、下管1/3区间为高频开关、2/3区间为低频工作，任意时刻只有一相桥臂高频工作、其他两相桥臂低频工作，以将由所述直流储能电路输入的稳定的直流电流转换为交流电流输出。Further optionally, the controller is specifically configured to control the power switch tube of the inverter bridge arm circuit in the current source inverter system to adopt a 120° rotation conduction working mode, and any bridge arm upper and lower tubes 1 /3 section is high frequency switch, 2/3 section is low frequency operation, only one phase bridge arm high frequency operation and low frequency operation of other two phase bridge arms at any time to convert the stable DC current input by the DC energy storage circuit For AC current output.
本发明实施例第二方面提供一种逆变装置，包括如本发明实施例第一方面提供的任意一种电流源逆变器***。A second aspect of the embodiments of the present invention provides an inverter device including any current source inverter system according to the first aspect of the embodiments of the present invention.
进一步可选的，所述逆变装置用于使用电流源逆变器***的应用中，所述逆变装置包括以下一种或几种：光伏发电装置、不间断电源、变频电源及通信逆变器。Further optionally, the inverter device is used in an application using a current source inverter system, and the inverter device includes one or more of the following: a photovoltaic power generation device, an uninterruptible power supply, a variable frequency power supply, and a communication inverter. Device.
本发明实施例中，光伏组串提供的直流电流经过直流储能电路的电感器滤波，采用功率二极管实现续流，以稳定的直流电流输入给逆变桥臂电路，控制器经过SPWM调制得到的开关驱动信号把输入给逆变桥臂电路的直流电流输 入转换为交流电流SPWM方波输出，再经过电容器与电感器构成的交流滤波电路滤除高频纹波后得到正弦波电流，最终并入交流电网实现光伏并网发电。这种电流源逆变器无需使用直流母线电容器，也无需直流母线电压控制，通过重新构造逆变器的***架构，应用于光伏发电技术中有利于提升光伏发电***的发电量和工作效率，同时降低***成本。In the embodiment of the invention, the DC current provided by the PV string is filtered by the inductor of the DC energy storage circuit, and the power diode is used to realize freewheeling, and the DC current is input to the inverter bridge arm circuit, and the controller is obtained by SPWM modulation. The switch drive signal inputs the DC current input to the inverter bridge circuit The input is converted into an AC current SPWM square wave output, and then an AC filter circuit composed of a capacitor and an inductor filters out the high frequency ripple to obtain a sine wave current, and finally is integrated into the AC grid to realize photovoltaic grid-connected power generation. This current source inverter eliminates the need for DC bus capacitors and DC bus voltage control. By reconfiguring the system architecture of the inverter, it is beneficial to increase the power generation and work efficiency of the photovoltaic power generation system. Reduce system costs.
附图说明DRAWINGS
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are Some embodiments of the present invention may also be used to obtain other drawings based on these drawings without departing from the art.
图1是现有技术中两级式电压源逆变器光伏发电***的结构示意图；1 is a schematic structural view of a two-stage voltage source inverter photovoltaic power generation system in the prior art;
图2是现有技术中单极式电压源逆变器结合升压变压器的光伏发电***的结构示意图；2 is a schematic structural view of a photovoltaic power generation system of a unipolar voltage source inverter combined with a step-up transformer in the prior art;
图3是本发明第一实施例提供的一种电流源逆变器***的整体结构示意图；3 is a schematic overall structural diagram of a current source inverter system according to a first embodiment of the present invention;
图4是本发明第二实施例提供的一种电流源逆变器***的接线示意图；4 is a schematic diagram of wiring of a current source inverter system according to a second embodiment of the present invention;
图4-1是本发明第二实施例提供的电流源逆变器***的SPWN调制策略示意图；4-1 is a schematic diagram of an SPWN modulation strategy of a current source inverter system according to a second embodiment of the present invention;
图5是本发明第三实施例提供的一种电流源逆变器***的接线示意图；5 is a schematic diagram of wiring of a current source inverter system according to a third embodiment of the present invention;
图6是本发明第四实施例提供的一种电流源逆变器***的接线示意图；6 is a schematic diagram of wiring of a current source inverter system according to a fourth embodiment of the present invention;
图7是本发明第五实施例提供的一种电流源逆变器***的接线示意图；7 is a schematic diagram of wiring of a current source inverter system according to a fifth embodiment of the present invention;
图8是本发明第六实施例提供的一种电流源逆变器***的接线示意图；8 is a schematic diagram of wiring of a current source inverter system according to a sixth embodiment of the present invention;
图9是本发明第七实施例提供的一种电流源逆变器***的接线示意图；9 is a schematic diagram of wiring of a current source inverter system according to a seventh embodiment of the present invention;
图10是本发明第八实施例提供的电流源逆变器***构成的多级并联光伏发电***的接线示意图；10 is a schematic diagram of wiring of a multi-stage parallel photovoltaic power generation system constructed by a current source inverter system according to an eighth embodiment of the present invention;
图11是本发明第九实施例提供的一种单台电流源逆变器***内部的多路MPPT结构的接线示意图； 11 is a schematic diagram of wiring of a multi-channel MPPT structure in a single current source inverter system according to a ninth embodiment of the present invention;
图12是本发明第十实施例提供的另一种单台电流源逆变器***内部的多路MPPT结构的接线示意图；12 is a schematic diagram of wiring of a multi-channel MPPT structure in another single current source inverter system according to a tenth embodiment of the present invention;
图13是本发明第十一实施例提供的另一种单台电流源逆变器***内部的多路MPPT结构的接线示意图；13 is a schematic diagram showing the wiring of a multi-channel MPPT structure in another single current source inverter system according to an eleventh embodiment of the present invention;
图14是本发明第十二实施例提供的另一种单台电流源逆变器***内部的多路MPPT结构的接线示意图；14 is a schematic diagram of wiring of a multi-channel MPPT structure inside another single current source inverter system according to a twelfth embodiment of the present invention;
图15是本发明第十三实施例提供的一种单个光伏组串时的电流源逆变器***交错并联的接线示意图；15 is a schematic diagram showing the interconnection and arrangement of a current source inverter system in a staggered parallel connection in a single photovoltaic string according to a thirteenth embodiment of the present invention;
图16是本发明第十四实施例提供的另一种单个光伏组串时的电流源逆变器***交错并联的接线示意图；16 is a schematic diagram showing the wiring of the current source inverter system in an interleaved parallel manner when another single photovoltaic string is provided in the fourteenth embodiment of the present invention;
图17是本发明第十五实施例提供的又一种单个光伏组串时的电流源逆变器***交错并联的接线示意图；17 is a schematic diagram showing the wiring of the current source inverter system in an interleaved parallel manner when another single photovoltaic string is provided in the fifteenth embodiment of the present invention;
图18是本发明第十六实施例提供的再一种单个光伏组串时的电流源逆变器***交错并联的接线示意图；18 is a schematic diagram showing the wiring of the current source inverter system in an interleaved parallel manner when another single photovoltaic string is provided in the sixteenth embodiment of the present invention;
图19是本发明第十七实施例提供的电流源逆变器***耦合电感结构的接线示意图。19 is a wiring diagram of a coupled inductor structure of a current source inverter system according to a seventeenth embodiment of the present invention.
具体实施方式detailed description
为了使本技术领域的人员更好地理解本发明方案，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. Some embodiments of the invention, rather than all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
本发明的说明书和权利要求书及上述附图中的术语“包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、***、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元，或可选地还包括对于这些过程、方法、产品或设备固有的其他步骤或单元。 The terms "comprising" and "comprising" and variations of the invention are intended to be in the meaning For example, a process, method, system, product, or device that comprises a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or alternatively Other steps or units inherent to these processes, methods, products, or equipment.
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本发明的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。References to "an embodiment" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the invention. The appearances of the phrases in various places in the specification are not necessarily referring to the same embodiments, and are not exclusive or alternative embodiments that are mutually exclusive. Those skilled in the art will understand and implicitly understand that the embodiments described herein can be combined with other embodiments.
请参阅图3，图3是本发明第一实施例提供的一种电流源逆变器***的整体结构示意图，如图3所示，本发明实施例中的电流源逆变器***100，包括：直流储能电路110、逆变桥臂电路120、交流滤波电路130、控制器140，其中，所述直流储能电路110与光伏组串电连接，所述直流储能电路110与所述逆变桥臂电路120电连接，所述逆变桥臂电路120与所述交流滤波电路130电连接，所述控制器140与所述逆变桥臂电路电连接，所述控制器140用于控制所述逆变桥臂电路120的工作；Referring to FIG. 3, FIG. 3 is a schematic diagram of an overall structure of a current source inverter system according to a first embodiment of the present invention. As shown in FIG. 3, the current source inverter system 100 of the embodiment of the present invention includes a DC energy storage circuit 110, an inverter bridge circuit 120, an AC filter circuit 130, and a controller 140, wherein the DC energy storage circuit 110 is electrically connected to a PV string, and the DC energy storage circuit 110 and the inverse The bridge arm circuit 120 is electrically connected, the inverter bridge arm circuit 120 is electrically connected to the alternating current filter circuit 130, the controller 140 is electrically connected to the inverter bridge arm circuit, and the controller 140 is used for controlling The operation of the inverter bridge arm circuit 120;
其中，所述直流储能电路将所述光伏组串提供的直流电流进行滤波、续流形成稳定的直流电流，并将所述稳定的直流电流输入给所述逆变桥臂电路，所述逆变桥臂电路将所述稳定的直流电流转换为交流电流、并输出给所述交流滤波电路，所述交流滤波电路将所述交流电流转换为正弦波电流，最终并入交流电网实现光伏并网发电。The DC energy storage circuit filters and renews the DC current provided by the PV string to form a stable DC current, and inputs the stable DC current to the inverter bridge circuit, the inverse The variable bridge arm circuit converts the stable direct current into an alternating current and outputs the same to the alternating current filter circuit, and the alternating current filter circuit converts the alternating current into a sinusoidal current, and finally merges into an alternating current grid to realize photovoltaic grid connection. Power generation.
具体地，光伏组串提供的电流源经过直流储能电路的电感器滤波，采用功率二极管实现续流，以稳定的直流电流输入给三相逆变桥臂，每个桥臂开关管无需串联功率二极管。经过SPWM调制得到的开关驱动信号把直流电流源输入转换为交流电流源SPWM方波输出，再经过电容器与电感器构成的交流滤波电路滤除高频纹波后得到正弦波电流，最终并入三相交流电网实现光伏并网发电。控制器实现交、直流侧的电量检测、通讯、保护等功能，同时也实现逆变桥臂的载波调制策略与并网电流算法。这种电流源逆变器无需使用直流母线电容器，也无需直流母线电压控制。每个桥臂开关管采用120°轮换导通工作模式，三相电网中任一相的相电压瞬时值高于其正峰值电压一半以上时，该相桥臂的上管持续导通、下管持续关断；相电压瞬时值低于其负峰值电压一半以 下时，该相桥臂的下管持续导通、上管持续关断；相电压瞬时值处于其一半的正峰值电压与一半的负峰值电压之间时，该相桥臂的上、下管进行SPWM高频调制。一个完整的360°电网工频周期内，每个桥臂移相调制120°，同时所有上、下管1/3区间为高频开关、2/3区间为低频工作。同时，三相桥臂中任意时刻只有一相桥臂高频工作、其他两相桥臂低频工作。另外可以通过控制同一桥臂上、下开关管的共通时间，实现电流型逆变器的内在升压功能，而无需DC/DC变换器、或交流升压变压器。Specifically, the current source provided by the photovoltaic string is filtered by the inductor of the DC storage circuit, and the power diode is used to realize freewheeling, and the stable DC current is input to the three-phase inverter bridge arm, and each bridge arm switch tube does not need series power. diode. The switch drive signal obtained by SPWM modulation converts the DC current source input into an AC current source SPWM square wave output, and then the AC filter circuit formed by the capacitor and the inductor filters out the high frequency ripple to obtain a sine wave current, and finally merges into three. The AC grid realizes photovoltaic grid-connected power generation. The controller realizes the functions of power detection, communication and protection on the AC and DC sides, and also implements the carrier modulation strategy and grid-connected current algorithm of the inverter bridge arm. This current source inverter eliminates the need for DC bus capacitors and DC bus voltage control. Each bridge arm switch tube adopts a 120° rotation conduction working mode. When the instantaneous value of the phase voltage of any phase in the three-phase power grid is higher than half of its positive peak voltage, the upper tube of the phase bridge arm is continuously turned on and the lower tube Continuous shutdown; the instantaneous value of the phase voltage is less than half of its negative peak voltage When the bottom tube of the phase bridge arm is continuously turned on and the upper tube is continuously turned off; when the instantaneous value of the phase voltage is between half of the positive peak voltage and half of the negative peak voltage, the upper and lower tubes of the phase bridge arm Perform SPWM high frequency modulation. In a complete 360° grid power frequency cycle, each bridge arm is phase-shifted by 120°, while all upper and lower tubes are in the high-frequency switch and the 2/3 interval is low-frequency operation. At the same time, at any time in the three-phase bridge arm, only one phase bridge arm operates at a high frequency, and the other two-phase bridge arms operate at a low frequency. In addition, the internal boost function of the current-type inverter can be realized by controlling the common time of the upper and lower switching tubes of the same bridge arm without DC/DC converter or AC step-up transformer.
进一步可选的，所述控制器具体用于实现基于正弦脉宽调制得到的功率开关管驱动信号控制所述逆变桥臂电路，以将由所述直流储能电路输入的稳定的直流电流转换为交流电流输出。Further optionally, the controller is specifically configured to implement the power switch tube driving signal based on the sinusoidal pulse width modulation to control the inverter bridge arm circuit to convert the stable DC current input by the DC energy storage circuit into AC current output.
可以看出，本发明实施例中，光伏组串提供的直流电流经过直流储能电路的电感器滤波，采用功率二极管实现续流，以稳定的直流电流输入给逆变桥臂电路，控制器经过SPWM调制得到的开关驱动信号把输入给逆变桥臂电路的直流电流输入转换为交流电流SPWM方波输出，再经过电容器与电感器构成的交流滤波电路滤除高频纹波后得到正弦波电流，最终并入交流电网实现光伏并网发电。这种电流源逆变器无需使用直流母线电容器，也无需直流母线电压控制，通过重新构造逆变器的***架构，应用于光伏发电技术中有利于提升光伏发电***的发电量和工作效率，同时降低***成本。It can be seen that, in the embodiment of the present invention, the DC current provided by the PV string is filtered by the inductor of the DC energy storage circuit, and the power diode is used to realize the freewheeling, and the DC current is input to the inverter bridge arm circuit, and the controller passes through The switch drive signal obtained by SPWM modulation converts the DC current input input to the inverter bridge arm circuit into an AC current SPWM square wave output, and then extracts the sine wave current after filtering the high frequency ripple through the AC filter circuit formed by the capacitor and the inductor. Finally, it is integrated into the AC grid to realize photovoltaic grid-connected power generation. This current source inverter eliminates the need for DC bus capacitors and DC bus voltage control. By reconfiguring the system architecture of the inverter, it is beneficial to increase the power generation and work efficiency of the photovoltaic power generation system. Reduce system costs.
请参阅图4，图4是本发明第二实施例提供的一种电流源逆变器***的接线示意图，如图4所示，所述光伏组串包括N个串联的光伏组件；Referring to FIG. 4, FIG. 4 is a schematic diagram of wiring of a current source inverter system according to a second embodiment of the present invention. As shown in FIG. 4, the photovoltaic string includes N series photovoltaic modules;
所述直流储能电路包括第一二极管Di和第一电感Ld，其中，所述第一二极管Di的输入端口与所述光伏组串PV的第一端口连接，所述第一二极管Di的输出端口与所述光伏组串PV的第二端口连接，所述第一电感Ld的的第一端口与所述光伏组串PV的第二端口连接，所述第一电感Ld的的第二端口与所述逆变桥臂电路的第一端口连接，所述光伏组串PV的第一端口与所述逆变桥臂电路的第二端口连接；The DC energy storage circuit includes a first diode Di and a first inductor Ld, wherein an input port of the first diode Di is connected to a first port of the PV string PV, the first two An output port of the pole tube Di is connected to a second port of the PV string PV, and a first port of the first inductor Ld is connected to a second port of the PV string PV, the first inductor Ld The second port is connected to the first port of the inverter bridge circuit, and the first port of the PV string PV is connected to the second port of the inverter bridge circuit;
所述逆变桥臂电路包括第二功率开关管S2、第三功率开关管S3、第四功 率开关管S4、第五功率开关管S5、第六功率开关管S6、第七功率开关管S7、第二二极管D2、第三二极管D3、第四二极管D4、第五二极管D5、第六二极管D6、第七二极管D7，其中，所述第三功率开关管S3与第三二极管D3并联连接的第一端口、所述第五功率开关管S5与第五二极管D5并联连接的第一端口及所述第七功率开关管S7与第七二极管D7并联连接的第一端口连接，连接节点为所述逆变桥臂电路的第一端口；所述第二功率开关管S2与第二二极管D2并联连接的第二端口、所述第四功率开关管S4与第四二极管D4并联连接的第二端口及所述第六功率开关管S6与第六二极管D6并联连接的第二端口连接，连接节点为所述逆变桥臂电路的第二端口；The inverter bridge arm circuit includes a second power switch tube S2, a third power switch tube S3, and a fourth power Rate switch tube S4, fifth power switch tube S5, sixth power switch tube S6, seventh power switch tube S7, second diode D2, third diode D3, fourth diode D4, fifth two a diode D5, a sixth diode D6, and a seventh diode D7, wherein the third port of the third power switch S3 and the third diode D3 are connected in parallel, and the fifth power switch S5 a first port connected in parallel with the fifth diode D5 and a first port in which the seventh power switch S7 and the seventh diode D7 are connected in parallel, and the connection node is the first of the inverter bridge circuit a second port in which the second power switch S2 is connected in parallel with the second diode D2, a second port in which the fourth power switch S4 and the fourth diode D4 are connected in parallel, and the sixth The power switch tube S6 is connected to the second port connected in parallel with the sixth diode D6, and the connection node is the second port of the inverter bridge arm circuit;
所述第二功率开关管S2与第二二极管D2并联连接的第一端口与所述第三功率开关管S3与第三二极管D3并联连接的第二端口、所述交流滤波电路的第一端口连接；所述第四功率开关管S4与第四二极管D4并联连接的第一端口与所述第五功率开关管S5与第五二极管D5并联连接的第二端口、所述交流滤波电路的第二端口连接；所述第六功率开关管S6与第六二极管D6并联连接的第一端口与所述第七功率开关管S7与第七二极管D7并联连接的第二端口、所述交流滤波电路的第三端口连接；a second port in which the second power switch S2 is connected in parallel with the second diode D2 and a second port in which the third power switch S3 and the third diode D3 are connected in parallel, and the AC filter circuit a first port is connected; a first port in which the fourth power switch S4 is connected in parallel with the fourth diode D4 and a second port in which the fifth power switch S5 and the fifth diode D5 are connected in parallel a second port of the AC filter circuit is connected; a first port in which the sixth power switch S6 and the sixth diode D6 are connected in parallel is connected in parallel with the seventh power switch S7 and the seventh diode D7. a second port, the third port of the AC filter circuit is connected;
所述交流滤波电路包括第二电容Ca、第三电容Cb、第四电容Cc、第二电感La、第三电感Lb、第四电感Lc，其中，所述第二电容Ca的第一端口与所述第二电感La的第一端口连接，连接节点为所述交流滤波电路的第一端口；所述第三电容Cb的第一端口与所述第三电感Lb的第一端口连接，连接节点为所述交流滤波电路的第二端口；所述第四电容Cc的第一端口与所述第四电感Lc的第一端口连接，连接节点为所述交流滤波电路的第三端口；所述第二电感La的第二端口、第三电感Lb的第二端口、第四电感Lc的第二端口分别并入相应的交流电网。The AC filter circuit includes a second capacitor Ca, a third capacitor Cb, a fourth capacitor Cc, a second inductor La, a third inductor Lb, and a fourth inductor Lc, wherein the first port of the second capacitor Ca is a first port of the second inductor La is connected, the connection node is a first port of the AC filter circuit; a first port of the third capacitor Cb is connected to a first port of the third inductor Lb, and the connection node is a second port of the AC filter circuit; a first port of the fourth capacitor Cc is connected to a first port of the fourth inductor Lc, and a connection node is a third port of the AC filter circuit; The second port of the inductor La, the second port of the third inductor Lb, and the second port of the fourth inductor Lc are respectively incorporated into a corresponding AC grid.
具体地，本发明实施例中的电流源逆变器为一种直流电流源输入的单级式三相电流源逆变器，光伏组串PV提供的直流电流源输入，经过储能电感器Ld滤波后，以稳定的直流电流输入给由两电平H桥构成的三相逆变桥臂，三相桥臂由功率开关管S2、S3、S4、S5、S6及S7构成，并且每个桥臂开关管 无需串联功率二极管，降低了逆变器的导通损耗。经过MCU数字SPWM调制得到的开关管驱动信号控制得到方波电流输出，电容器Ca、Cb、及Cc与电感器La、Lb、及Lc完成交流高频滤波后得到正弦波电流波形，最终并入三相交流电网实现并网发电。由于电流源逆变器的储能电感器Ld电流不可开路，因此直流侧采用功率二极管Di实现续流。这种电流源逆变器无需直流母线电压控制，提高了MPPT跟踪技术的精度与稳定性，提高***发电量。同时无需使用直流母线电容器，消除寿命较低部件的使用，提高光伏***的可靠性、延长工作寿命。Specifically, the current source inverter in the embodiment of the present invention is a single-stage three-phase current source inverter with a DC current source input, and the DC current source input provided by the PV string PV passes through the energy storage inductor Ld. After filtering, a stable DC current is input to a three-phase inverter bridge arm composed of a two-level H-bridge, and the three-phase bridge arm is composed of power switch tubes S2, S3, S4, S5, S6 and S7, and each bridge Arm switch tube Eliminating the need for a series power diode reduces the conduction losses of the inverter. The switching tube drive signal obtained by the MCU digital SPWM modulation is controlled to obtain the square wave current output, and the capacitors Ca, Cb, and Cc and the inductors La, Lb, and Lc are subjected to the AC high-frequency filtering to obtain a sine wave current waveform, and finally merge into three. The AC grid realizes grid-connected power generation. Since the current storage inductor Ld current of the current source inverter cannot be opened, the DC side uses the power diode Di to achieve freewheeling. This current source inverter does not require DC bus voltage control, which improves the accuracy and stability of the MPPT tracking technology and increases the system power generation. At the same time, DC bus capacitors are not needed, eliminating the use of components with lower life, improving the reliability of the photovoltaic system and extending the working life.
请参阅图4-1，图4-1是本发明第二实施例提供的电流源逆变器***的SPWM调制策略示意图。如图4-1所示，交流电网在50Hz工作频率下，直流电流源输入的单级式三相电流源逆变器的每个桥臂开关管采用120°轮换导通工作模式，其中uA、uB、uC为三相交流电网的相电压，S2、S3、S4、S5、S6、S7为六个功率开关管的驱动信号。三相电网中任一相的相电压瞬时值高于其正峰值电压一半以上时，该相桥臂的上管持续导通、下管持续关断；任一相的相电压瞬时值低于其负峰值电压一半以下时，该相桥臂的下管持续导通、上管持续关断，这两个区间称为低频工作；任一相的相电压瞬时值处于其一半的正峰值电压与一半的负峰值电压之间时，该相桥臂的上、下管执行正弦波SPWM调制策略，这个区间称为高频工作。一个完整的360°电网工频周期内对于A相桥臂来说，30°～150°区间上管持续导通、下管持续关断，210°～330°区间下管持续导通、上管持续关断，0°～30°与150°～210°、330°～360°区间上、下管进行正弦波SPWM调制工作。因此，在一个完整的360°电网工频周期内，A相的上、下管只有1/3区间为高频工作、其他2/3区间为低频工作。其他两相的工作状况与A完全相同，只是调制策略上移相120°。因此，三相桥臂中任意时刻只有一相桥臂高频工作、其他两相桥臂低频工作，这样极大降低了三相电流源逆变器的开关损耗，提高了***效率与发电量。这种120°轮换导通工作模式既可以由DSP、CPLD、MCU等数字程序控制方式实现，也可以采用逻辑门、比较器、加法器、及专用芯片等模拟方式实现。另外也可通过控制电流源逆变器同一桥臂上的两个开关管的重叠导通时间，用以控制电流源逆变器 的直流侧电流，可实现从弱光至强光全过程的光能利用，这就是电流型逆变器内在升压特性的基本原理，同时电流型逆变器实现MPPT跟踪控制更方便可靠。由于这种内在升压特性，光伏组串电压低于电网峰值电压时也能并网发电，这样拓宽了输入电压范围、提高了***发电量，因此这种电流源逆变器无需直流升压变换电路、或升压变压器环节，从而降低***功耗、重量、体积、及价格，并提高***效率。软件控制策略中直接以并网电流为控制对象，并网电流谐波更低，可以实时、快速地实现过电流保护。同时便于实现四象限运行，可以根据电网调度要求，灵活稳定地实现有功降额、无功调节，适应智能电网的要求。另外，并网电流不受电网影响，更稳定、更易控制，在电网波动或者畸变的情况下也能实现高质量并网发电。同时，本控制策略适用于任一三相电流源逆变***，并不限于本发明实施例中的直流电流源输入的单级式三相电流源逆变器***。Referring to FIG. 4-1, FIG. 4-1 is a schematic diagram of an SPWM modulation strategy of a current source inverter system according to a second embodiment of the present invention. As shown in Figure 4-1, in the AC grid at 50 Hz operating frequency, each bridge arm of the single-stage three-phase current source inverter with DC current source input adopts a 120° rotation conduction mode, where u A , u B , u C are the phase voltages of the three-phase AC power grid, and S2, S3, S4, S5, S6, and S7 are the driving signals of the six power switch tubes. When the instantaneous value of the phase voltage of any phase in the three-phase power grid is higher than half of its positive peak voltage, the upper tube of the phase bridge arm is continuously turned on, and the lower tube is continuously turned off; the instantaneous value of the phase voltage of any phase is lower than its When the negative peak voltage is less than half, the lower tube of the phase bridge arm is continuously turned on, and the upper tube is continuously turned off. These two intervals are called low frequency operation; the instantaneous value of the phase voltage of any phase is at half of its positive peak voltage and half. When the negative peak voltage is between, the upper and lower tubes of the phase bridge arm perform a sine wave SPWM modulation strategy, and this interval is called high frequency operation. For a complete 360° grid power frequency cycle, for the A-phase bridge arm, the upper tube is continuously turned on in the range of 30° to 150°, the lower tube is continuously turned off, and the tube is continuously turned on and the upper tube is in the range of 210° to 330°. Continuously shut off, sinusoidal SPWM modulation is performed on the upper and lower tubes in the range of 0° to 30° and 150° to 210° and 330° to 360°. Therefore, in a complete 360° grid power frequency cycle, only 1/3 of the upper and lower tubes of the A phase are high frequency operation, and the other 2/3 intervals are low frequency operation. The other two phases work exactly the same as A, except that the modulation strategy is shifted by 120°. Therefore, at any time in the three-phase bridge arm, only one phase bridge arm operates at a high frequency, and the other two-phase bridge arm operates at a low frequency, which greatly reduces the switching loss of the three-phase current source inverter, and improves system efficiency and power generation. The 120° rotation conduction mode can be realized by digital program control methods such as DSP, CPLD, MCU, etc., or by analog gates such as logic gates, comparators, adders, and dedicated chips. In addition, by controlling the overlapping on-time of the two switching tubes on the same bridge arm of the current source inverter, the DC-side current of the current source inverter can be controlled, and the light from the low light to the strong light can be realized. Can be utilized, this is the basic principle of the internal boosting characteristics of the current-type inverter, and the current-type inverter realizes MPPT tracking control more convenient and reliable. Due to this inherent boosting characteristic, the PV string voltage can be connected to the grid when the voltage is lower than the peak voltage of the grid. This widens the input voltage range and increases the system power generation. Therefore, this current source inverter does not require DC boost conversion. Circuits, or step-up transformers, reducing system power, weight, size, and price, and increasing system efficiency. In the software control strategy, the grid-connected current is directly controlled, and the grid-connected current harmonics are lower, which can realize over-current protection in real time and fast. At the same time, it is easy to realize four-quadrant operation, and it can flexibly and stably realize active derating and reactive power regulation according to grid dispatching requirements, and adapt to the requirements of smart grid. In addition, the grid-connected current is not affected by the power grid, is more stable and easier to control, and can achieve high-quality grid-connected power generation even in the case of grid fluctuations or distortions. At the same time, the present control strategy is applicable to any three-phase current source inverter system, and is not limited to the single-stage three-phase current source inverter system of the DC current source input in the embodiment of the present invention.
可以看出，本发明实施例中，光伏组串提供的直流电流经过直流储能电路的电感器滤波，采用功率二极管实现续流，以稳定的直流电流输入给逆变桥臂电路，控制器经过SPWM调制得到的开关驱动信号把输入给逆变桥臂电路的直流电流输入转换为交流电流SPWM方波输出，再经过电容器与电感器构成的交流滤波电路滤除高频纹波后得到正弦波电流，最终并入交流电网实现光伏并网发电。这种电流源逆变器无需使用直流母线电容器，也无需直流母线电压控制，通过重新构造逆变器的***架构，应用于光伏发电技术中有利于提升光伏发电***的发电量和工作效率，同时降低***成本。It can be seen that, in the embodiment of the present invention, the DC current provided by the PV string is filtered by the inductor of the DC energy storage circuit, and the power diode is used to realize the freewheeling, and the DC current is input to the inverter bridge arm circuit, and the controller passes through The switch drive signal obtained by SPWM modulation converts the DC current input input to the inverter bridge arm circuit into an AC current SPWM square wave output, and then extracts the sine wave current after filtering the high frequency ripple through the AC filter circuit formed by the capacitor and the inductor. Finally, it is integrated into the AC grid to realize photovoltaic grid-connected power generation. This current source inverter eliminates the need for DC bus capacitors and DC bus voltage control. By reconfiguring the system architecture of the inverter, it is beneficial to increase the power generation and work efficiency of the photovoltaic power generation system. Reduce system costs.
请参阅图5，图5是本发明第三实施例提供的一种电流源逆变器***的接线示意图，如图5所示，所述光伏组串包括N个串联的光伏组件；Referring to FIG. 5, FIG. 5 is a schematic diagram of wiring of a current source inverter system according to a third embodiment of the present invention. As shown in FIG. 5, the photovoltaic string includes N series photovoltaic modules;
所述直流储能电路包括第一电容Cin和第一电感Ld，其中，所述第一电容Cin的输入端口与所述光伏组串PV的第一端口连接，所述第一电容Cin的输出端口与所述光伏组串PV的第二端口连接，所述第一电感Ld的的第一端口与所述光伏组串PV的第二端口连接，所述第一电感Ld的的第二端口与所述逆变桥臂电路的第一端口连接，所述光伏组串PV的第一端口与所述逆变桥 臂电路的第二端口连接；The DC energy storage circuit includes a first capacitor Cin and a first inductor Ld, wherein an input port of the first capacitor Cin is connected to a first port of the PV string PV, and an output port of the first capacitor Cin Connected to the second port of the PV string PV, the first port of the first inductor Ld is connected to the second port of the PV string PV, and the second port of the first inductor Ld is a first port connection of the inverter bridge arm circuit, a first port of the PV string PV and the inverter bridge Connecting the second port of the arm circuit;
所述逆变桥臂电路包括第二功率开关管S2、第三功率开关管S3、第四功率开关管S4、第五功率开关管S5、第六功率开关管S6、第七功率开关管S7、第二二极管D2、第三二极管D3、第四二极管D4、第五二极管D5、第六二极管D6、第七二极管D7，其中，所述第三功率开关管S3与第三二极管D3并联连接的第一端口、所述第五功率开关管S5与第五二极管D5并联连接的第一端口及所述第七功率开关管S7与第七二极管D7并联连接的第一端口连接，连接节点为所述逆变桥臂电路的第一端口；所述第二功率开关管S2与第二二极管D2并联连接的第二端口、所述第四功率开关管S4与第四二极管D4并联连接的第二端口及所述第六功率开关管S6与第六二极管D6并联连接的第二端口连接，连接节点为所述逆变桥臂电路的第二端口；The inverter bridge arm circuit includes a second power switch tube S2, a third power switch tube S3, a fourth power switch tube S4, a fifth power switch tube S5, a sixth power switch tube S6, and a seventh power switch tube S7. a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, and a seventh diode D7, wherein the third power switch a first port in which the tube S3 is connected in parallel with the third diode D3, a first port in which the fifth power switch tube S5 and the fifth diode D5 are connected in parallel, and the seventh power switch tube S7 and the seventh unit a first port connected in parallel with the pole tube D7, the connection node being a first port of the inverter bridge arm circuit; a second port in which the second power switch tube S2 is connected in parallel with the second diode D2, the a second port in which the fourth power switch S4 is connected in parallel with the fourth diode D4 and a second port in which the sixth power switch S6 and the sixth diode D6 are connected in parallel, and the connection node is the inverter a second port of the bridge arm circuit;
所述第二功率开关管S2与第二二极管D2并联连接的第一端口与所述第三功率开关管S3与第三二极管D3并联连接的第二端口、所述交流滤波电路的第一端口连接；所述第四功率开关管S4与第四二极管D4并联连接的第一端口与所述第五功率开关管S5与第五二极管D5并联连接的第二端口、所述交流滤波电路的第二端口连接；所述第六功率开关管S6与第六二极管D6并联连接的第一端口与所述第七功率开关管S7与第七二极管D7并联连接的第二端口、所述交流滤波电路的第三端口连接；a second port in which the second power switch S2 is connected in parallel with the second diode D2 and a second port in which the third power switch S3 and the third diode D3 are connected in parallel, and the AC filter circuit a first port is connected; a first port in which the fourth power switch S4 is connected in parallel with the fourth diode D4 and a second port in which the fifth power switch S5 and the fifth diode D5 are connected in parallel a second port of the AC filter circuit is connected; a first port in which the sixth power switch S6 and the sixth diode D6 are connected in parallel is connected in parallel with the seventh power switch S7 and the seventh diode D7. a second port, the third port of the AC filter circuit is connected;
所述交流滤波电路包括第二电容Ca、第三电容Cb、第四电容Cc、第二电感La、第三电感Lb、第四电感Lc，其中，所述第二电容Ca的第一端口与所述第二电感La的第一端口连接，连接节点为所述交流滤波电路的第一端口；所述第三电容Cb的第一端口与所述第三电感Lb的第一端口连接，连接节点为所述交流滤波电路的第二端口；所述第四电容Cc的第一端口与所述第四电感Lc的第一端口连接，连接节点为所述交流滤波电路的第三端口；所述第二电感La的第二端口、第三电感Lb的第二端口、第四电感Lc的第二端口分别并入相应的交流电网。The AC filter circuit includes a second capacitor Ca, a third capacitor Cb, a fourth capacitor Cc, a second inductor La, a third inductor Lb, and a fourth inductor Lc, wherein the first port of the second capacitor Ca is a first port of the second inductor La is connected, the connection node is a first port of the AC filter circuit; a first port of the third capacitor Cb is connected to a first port of the third inductor Lb, and the connection node is a second port of the AC filter circuit; a first port of the fourth capacitor Cc is connected to a first port of the fourth inductor Lc, and a connection node is a third port of the AC filter circuit; The second port of the inductor La, the second port of the third inductor Lb, and the second port of the fourth inductor Lc are respectively incorporated into a corresponding AC grid.
具体地，本发明实施例中的电流源逆变器为一种直流电压源输入的单级式三相电流源逆变器，光伏组串PV或其他直流电源提供的直流电压源输入，经 过电容Cin滤波、并由滤波、储能功能的电感器Ld将直流电压源转换为直流电流源后，以稳定的直流电流输入给由两电平H桥构成的三相逆变桥臂，三相桥臂由S2、S3、S4、S5、S6、及S7功率开关管构成，并且每个桥臂开关管无需串联功率二极管，降低了逆变器的导通损耗。经过MCU数字SPWM调制得到的开关管驱动信号控制得到方波电流输出，电容器Ca、Cb、及Cc与电感器L1、L2、及L3完成交流高频滤波后得到正弦波电流波形，最终并入三相交流电网实现并网发电。这种电流源逆变器无需直流母线电压控制，提高了MPPT跟踪技术的精度与稳定性，提高***发电量。Specifically, the current source inverter in the embodiment of the present invention is a single-stage three-phase current source inverter with a DC voltage source input, a DC voltage source input provided by a PV string PV or other DC power source, After the capacitor Cin is filtered, the DC voltage source is converted into a DC current source by the inductor Ld of the filtering and energy storage function, and then input to the three-phase inverter bridge composed of the two-level H bridge with a stable DC current, three The phase bridge arm is composed of S2, S3, S4, S5, S6, and S7 power switch tubes, and each bridge arm switch tube does not need a series power diode, which reduces the conduction loss of the inverter. The switching tube drive signal obtained by the digital SPWM modulation of the MCU is controlled to obtain the square wave current output, and the capacitors Ca, Cb, and Cc and the inductors L1, L2, and L3 are subjected to the AC high-frequency filtering to obtain a sine wave current waveform, and finally merged into three. The AC grid realizes grid-connected power generation. This current source inverter does not require DC bus voltage control, which improves the accuracy and stability of the MPPT tracking technology and increases the system power generation.
其具体的三相电流源光伏逆变器的SPWN调制策略示意图请参阅图4-1所示的调制策略，本实施例不做赘述。For a schematic diagram of the SPWN modulation strategy of the specific three-phase current source photovoltaic inverter, refer to the modulation strategy shown in Figure 4-1, which is not described in this embodiment.
可以看出，本发明实施例中，光伏组串提供的直流电流经过直流储能电路的电感器滤波，采用功率二极管实现续流，以稳定的直流电流输入给逆变桥臂电路，控制器经过SPWM调制得到的开关驱动信号把输入给逆变桥臂电路的直流电流输入转换为交流电流SPWM方波输出，再经过电容器与电感器构成的交流滤波电路滤除高频纹波后得到正弦波电流，最终并入交流电网实现光伏并网发电。这种电流源逆变器无需使用直流母线电容器，也无需直流母线电压控制，通过重新构造逆变器的***架构，应用于光伏发电技术中有利于提升光伏发电***的发电量和工作效率，同时降低***成本。It can be seen that, in the embodiment of the present invention, the DC current provided by the PV string is filtered by the inductor of the DC energy storage circuit, and the power diode is used to realize the freewheeling, and the DC current is input to the inverter bridge arm circuit, and the controller passes through The switch drive signal obtained by SPWM modulation converts the DC current input input to the inverter bridge arm circuit into an AC current SPWM square wave output, and then extracts the sine wave current after filtering the high frequency ripple through the AC filter circuit formed by the capacitor and the inductor. Finally, it is integrated into the AC grid to realize photovoltaic grid-connected power generation. This current source inverter eliminates the need for DC bus capacitors and DC bus voltage control. By reconfiguring the system architecture of the inverter, it is beneficial to increase the power generation and work efficiency of the photovoltaic power generation system. Reduce system costs.
请参阅图6，图6是本发明第四实施例提供的一种电流源逆变器***的接线示意图，如图6所示，所述光伏组串PV包括N个串联的光伏组件；Please refer to FIG. 6. FIG. 6 is a schematic diagram of wiring of a current source inverter system according to a fourth embodiment of the present invention. As shown in FIG. 6, the PV string PV includes N series photovoltaic modules;
所述直流储能电路包括第一二极管Di和第一电感Ld，其中，所述第一二极管Di的输入端口与所述光伏组串PV的第一端口连接，所述第一二极管Di的输出端口与所述光伏组串PV的第二端口连接，所述第一电感Ld的的第一端口与所述光伏组串PV的第二端口连接，所述第一电感Ld的的第二端口与所述逆变桥臂电路的第一端口连接，所述光伏组串PV的第一端口与所述逆变桥臂电路的第二端口连接；The DC energy storage circuit includes a first diode Di and a first inductor Ld, wherein an input port of the first diode Di is connected to a first port of the PV string PV, the first two An output port of the pole tube Di is connected to a second port of the PV string PV, and a first port of the first inductor Ld is connected to a second port of the PV string PV, the first inductor Ld The second port is connected to the first port of the inverter bridge circuit, and the first port of the PV string PV is connected to the second port of the inverter bridge circuit;
所述逆变桥臂电路包括第二功率开关管S2、第三功率开关管S3、第四功 率开关管S4、第五功率开关管S5、第二二极管D2、第三二极管D3、第四二极管D4、第五二极管D5，其中，所述第二功率开关管S2与第二二极管D2并联连接的第二端口与所述第四功率开关管S4与第四二极管D4并联连接的第二端口连接，连接节点为所述逆变桥臂电路的第二端口；所述第三功率开关管S3与第三二极管D3并联连接的第一端口与所述第五功率开关管S5与第五二极管D5并联连接的第一端口连接，连接节点为所述逆变桥臂电路的第一端口；The inverter bridge arm circuit includes a second power switch tube S2, a third power switch tube S3, and a fourth power The switch S4, the fifth power switch S5, the second diode D2, the third diode D3, the fourth diode D4, and the fifth diode D5, wherein the second power switch S2 a second port connected in parallel with the second diode D2 is connected to a second port in which the fourth power switch tube S4 and the fourth diode D4 are connected in parallel, and the connection node is the second of the inverter bridge arm circuit a port; a first port in which the third power switch S3 is connected in parallel with the third diode D3 is connected to a first port in which the fifth power switch S5 and the fifth diode D5 are connected in parallel, and the connection node is a first port of the inverter bridge arm circuit;
所述第二功率开关管S2与第二二极管D2并联连接的第一端口与所述第三功率开关管S3与第三二极管D3并联连接的第二端口、所述交流滤波电路的第一端口连接；所述第四功率开关管S4与第四二极管D4并联连接的第一端口与所述第五功率开关管S5与第五二极管D5并联连接的第二端口、所述交流滤波电路的第二端口连接；a second port in which the second power switch S2 is connected in parallel with the second diode D2 and a second port in which the third power switch S3 and the third diode D3 are connected in parallel, and the AC filter circuit a first port is connected; a first port in which the fourth power switch S4 is connected in parallel with the fourth diode D4 and a second port in which the fifth power switch S5 and the fifth diode D5 are connected in parallel Connecting the second port of the AC filter circuit;
所述交流滤波电路包括第二电容Co、第二电感L2、第三电感L3，其中，所述第二电容Co的第一端口与所述第二电感L2的第一端口连接，连接节点为所述交流滤波电路的第一端口；所述第二电容Co的第二端口与所述第三电感L3的第一端口连接，连接节点为所述交流滤波电路的第二端口；所述第二电感L2的第二端口、第三电感L3的第二端口连接所述交流电网。The AC filter circuit includes a second capacitor Co, a second inductor L2, and a third inductor L3, wherein the first port of the second capacitor Co is connected to the first port of the second inductor L2, and the connection node is a first port of the AC filter circuit; a second port of the second capacitor Co is connected to the first port of the third inductor L3, and the connection node is a second port of the AC filter circuit; the second inductor The second port of L2 and the second port of the third inductor L3 are connected to the AC grid.
具体地，本发明实施例中的电流源逆变器为一种直流电流源输入的单级式单相电流源逆变器拓扑结构中，光伏组串PV提供的直流电流源输入，经过储能电感器Ld滤波后，以稳定的直流电流输入给由两电平H桥构成的全桥逆变桥臂，逆变桥臂由功率开关管S2、S3、S4及S5构成，并且每个桥臂开关管无需串联功率二极管，降低了逆变器的导通损耗。经过MCU数字SPWM调制得到的开关管驱动信号控制得到方波电流输出，电容器Co与电感器L2、及L3完成交流高频滤波后得到正弦波电流波形，最终并入单相交流电网实现并网发电。由于电流源逆变器的储能电感器电流不可开路，因此直流侧采用功率二极管实现续流。这种电流源逆变器无需直流母线电压控制，提高了MPPT跟踪技术的精度与稳定性，提高***发电量。同时无需使用直流母线电容器，消除寿命较低部件的使用，提高光伏***的可靠性、延长工作寿命。 Specifically, the current source inverter in the embodiment of the present invention is a single-stage single-phase current source inverter topology in which a DC current source is input, and the DC current source input provided by the PV string PV is subjected to energy storage. After the inductor Ld is filtered, a stable DC current is input to the full-bridge inverter bridge arm composed of a two-level H-bridge, and the inverter bridge arm is composed of power switch tubes S2, S3, S4 and S5, and each bridge arm The switch tube does not require a series power diode, which reduces the conduction loss of the inverter. The switching tube drive signal obtained by the MCU digital SPWM modulation is controlled to obtain the square wave current output, and the capacitor Co and the inductors L2 and L3 are subjected to the AC high-frequency filtering to obtain the sine wave current waveform, and finally merged into the single-phase AC grid to realize grid-connected power generation. . Since the current storage inductor current of the current source inverter cannot be opened, the DC side uses a power diode to achieve freewheeling. This current source inverter does not require DC bus voltage control, which improves the accuracy and stability of the MPPT tracking technology and increases the system power generation. At the same time, DC bus capacitors are not needed, eliminating the use of components with lower life, improving the reliability of the photovoltaic system and extending the working life.
可以看出，本发明实施例中，光伏组串提供的直流电流经过直流储能电路的电感器滤波，采用功率二极管实现续流，以稳定的直流电流输入给逆变桥臂电路，控制器经过SPWM调制得到的开关驱动信号把输入给逆变桥臂电路的直流电流输入转换为交流电流SPWM方波输出，再经过电容器与电感器构成的交流滤波电路滤除高频纹波后得到正弦波电流，最终并入交流电网实现光伏并网发电。这种电流源逆变器无需使用直流母线电容器，也无需直流母线电压控制，通过重新构造逆变器的***架构，应用于光伏发电技术中有利于提升光伏发电***的发电量和工作效率，同时降低***成本。It can be seen that, in the embodiment of the present invention, the DC current provided by the PV string is filtered by the inductor of the DC energy storage circuit, and the power diode is used to realize the freewheeling, and the DC current is input to the inverter bridge arm circuit, and the controller passes through The switch drive signal obtained by SPWM modulation converts the DC current input input to the inverter bridge arm circuit into an AC current SPWM square wave output, and then extracts the sine wave current after filtering the high frequency ripple through the AC filter circuit formed by the capacitor and the inductor. Finally, it is integrated into the AC grid to realize photovoltaic grid-connected power generation. This current source inverter eliminates the need for DC bus capacitors and DC bus voltage control. By reconfiguring the system architecture of the inverter, it is beneficial to increase the power generation and work efficiency of the photovoltaic power generation system. Reduce system costs.
请参阅图7，图7是本发明第五实施例提供的一种电流源逆变器***的接线示意图，如图7所示，所述光伏组串PV包括N个串联的光伏组件；Referring to FIG. 7, FIG. 7 is a schematic diagram of wiring of a current source inverter system according to a fifth embodiment of the present invention. As shown in FIG. 7, the PV string PV includes N series photovoltaic modules;
所述直流储能电路包括第一电容Cin和第一电感Ld，其中，所述第一电容Cin的输入端口与所述光伏组串PV的第一端口连接，所述第一电容Cin的输出端口与所述光伏组串PV的第二端口连接，所述第一电感Ld的的第一端口与所述光伏组串PV的第二端口连接，所述第一电感Ld的的第二端口与所述逆变桥臂电路的第一端口连接，所述光伏组串PV的第一端口与所述逆变桥臂电路的第二端口连接；The DC energy storage circuit includes a first capacitor Cin and a first inductor Ld, wherein an input port of the first capacitor Cin is connected to a first port of the PV string PV, and an output port of the first capacitor Cin Connected to the second port of the PV string PV, the first port of the first inductor Ld is connected to the second port of the PV string PV, and the second port of the first inductor Ld is a first port of the inverter bridge arm circuit is connected, and a first port of the PV string PV is connected to a second port of the inverter bridge circuit;
所述逆变桥臂电路包括第二功率开关管S2、第三功率开关管S3、第四功率开关管S4、第五功率开关管S5、第二二极管D2、第三二极管D3、第四二极管D4、第五二极管D5，其中，所述第二功率开关管S2与第二二极管D2并联连接的第二端口与所述第四功率开关管S4与第四二极管D4并联连接的第二端口连接，连接节点为所述逆变桥臂电路的第二端口；所述第三功率开关管S3与第三二极管D3并联连接的第一端口与所述第五功率开关管S5与第五二极管D5并联连接的第一端口连接，连接节点为所述逆变桥臂电路的第一端口；The inverter bridge arm circuit includes a second power switch tube S2, a third power switch tube S3, a fourth power switch tube S4, a fifth power switch tube S5, a second diode D2, and a third diode D3. a fourth diode D4 and a fifth diode D5, wherein the second port of the second power switch S2 and the second diode D2 are connected in parallel with the fourth power switch tube S4 and the fourth two a second port connected in parallel with the pole tube D4, the connection node being a second port of the inverter bridge arm circuit; a first port in which the third power switch tube S3 is connected in parallel with the third diode D3 The fifth power switch S5 is connected to the first port connected in parallel with the fifth diode D5, and the connection node is the first port of the inverter bridge circuit;
所述第二功率开关管S2与第二二极管D2并联连接的第一端口与所述第三功率开关管S3与第三二极管D3并联连接的第二端口、所述交流滤波电路的第一端口连接；所述第四功率开关管S4与第四二极管D4并联连接的第一 端口与所述第五功率开关管S5与第五二极管D5并联连接的第二端口、所述交流滤波电路的第二端口连接；a second port in which the second power switch S2 is connected in parallel with the second diode D2 and a second port in which the third power switch S3 and the third diode D3 are connected in parallel, and the AC filter circuit a first port is connected; the fourth power switch tube S4 is connected in parallel with the fourth diode D4. a port is connected to the second port in which the fifth power switch S5 and the fifth diode D5 are connected in parallel, and the second port of the AC filter circuit is connected;
所述交流滤波电路包括第二电容Co、第二电感L2、第三电感L3，其中，所述第二电容Co的第一端口与所述第二电感L2的第一端口连接，连接节点为所述交流滤波电路的第一端口；所述第二电容Co的第二端口与所述第三电感L3的第一端口连接，连接节点为所述交流滤波电路的第二端口；所述第二电感L2的第二端口、第三电感L3的第二端口连接所述交流电网。The AC filter circuit includes a second capacitor Co, a second inductor L2, and a third inductor L3, wherein the first port of the second capacitor Co is connected to the first port of the second inductor L2, and the connection node is a first port of the AC filter circuit; a second port of the second capacitor Co is connected to the first port of the third inductor L3, and the connection node is a second port of the AC filter circuit; the second inductor The second port of L2 and the second port of the third inductor L3 are connected to the AC grid.
具体地，本发明实施例中的电流源逆变器为一种直流电压源输入的单级式单相电流源逆变器拓扑结构中，光伏组串PV或其他直流电源提供的直流电压源输入，经过电容Cin滤波、并由滤波、储能功能的电感器Ld将直流电压源转换为直流电流源后，以稳定的直流电流输入给由两电平H桥构成的全桥逆变桥臂，逆变桥臂由功率开关管S2、S3、S4及S5构成，并且每个桥臂开关管无需串联功率二极管，降低了逆变器的导通损耗。经过MCU数字SPWM调制得到的开关管驱动信号控制得到方波电流输出，电容器Co与电感器L2、及L3完成交流高频滤波后得到正弦波电流波形，最终并入三相交流电网实现并网发电。这种电流源逆变器无需直流母线电压控制，提高了MPPT跟踪技术的精度与稳定性，提高***发电量。Specifically, the current source inverter in the embodiment of the present invention is a single-stage single-phase current source inverter topology in which a DC voltage source is input, and a DC voltage source input provided by a PV string PV or other DC power source. After the capacitor Cin is filtered and the DC voltage source is converted into a DC current source by the inductor Ld of the filtering and energy storage function, a stable DC current is input to the full-bridge inverter bridge arm composed of the two-level H-bridge. The inverter bridge arm is composed of power switch tubes S2, S3, S4 and S5, and each bridge arm switch tube does not need to be connected with a power diode, which reduces the conduction loss of the inverter. The switching tube drive signal obtained by the MCU digital SPWM modulation is controlled to obtain the square wave current output, and the capacitor Co and the inductors L2 and L3 are subjected to the AC high-frequency filtering to obtain the sine wave current waveform, and finally merged into the three-phase AC grid to realize grid-connected power generation. . This current source inverter does not require DC bus voltage control, which improves the accuracy and stability of the MPPT tracking technology and increases the system power generation.
可以看出，本发明实施例中，光伏组串提供的直流电流经过直流储能电路的电感器滤波，采用功率二极管实现续流，以稳定的直流电流输入给逆变桥臂电路，控制器经过SPWM调制得到的开关驱动信号把输入给逆变桥臂电路的直流电流输入转换为交流电流SPWM方波输出，再经过电容器与电感器构成的交流滤波电路滤除高频纹波后得到正弦波电流，最终并入交流电网实现光伏并网发电。这种电流源逆变器无需使用直流母线电容器，也无需直流母线电压控制，通过重新构造逆变器的***架构，应用于光伏发电技术中有利于提升光伏发电***的发电量和工作效率，同时降低***成本。It can be seen that, in the embodiment of the present invention, the DC current provided by the PV string is filtered by the inductor of the DC energy storage circuit, and the power diode is used to realize the freewheeling, and the DC current is input to the inverter bridge arm circuit, and the controller passes through The switch drive signal obtained by SPWM modulation converts the DC current input input to the inverter bridge arm circuit into an AC current SPWM square wave output, and then extracts the sine wave current after filtering the high frequency ripple through the AC filter circuit formed by the capacitor and the inductor. Finally, it is integrated into the AC grid to realize photovoltaic grid-connected power generation. This current source inverter eliminates the need for DC bus capacitors and DC bus voltage control. By reconfiguring the system architecture of the inverter, it is beneficial to increase the power generation and work efficiency of the photovoltaic power generation system. Reduce system costs.
请参阅图8，图8是本发明第六实施例提供的一种电流源逆变器***的接线示意图，如图8所示，所述光伏组串PV包括N个串联的光伏组件； Referring to FIG. 8, FIG. 8 is a schematic diagram of wiring of a current source inverter system according to a sixth embodiment of the present invention. As shown in FIG. 8, the PV string PV includes N series photovoltaic modules;
所述直流储能电路包括第一二极管Db、第一电感Lb、第八二极管Dm、开关管Sb，其中，所述第一二极管Db的输入端口与所述光伏组串PV的第一端口、所述开关管Sb的第一端口连接，所述第一二极管Db的输出端口与所述第一电感Lb的的第二端口、所述开关管Sb的第二端口、所述第八二极管Dm的输入端口连接，所述第一电感Lb的的第一端口与所述所光伏组串PV的第二端口连接，所述第八二极管Dm的输出端口与所述逆变桥臂电路的第一端口连接，所述光伏组串PV的第一端口与所述逆变桥臂电路的第二端口连接；The DC energy storage circuit includes a first diode Db, a first inductor Lb, an eighth diode Dm, and a switch tube Sb, wherein an input port of the first diode Db and the PV string PV a first port, a first port of the switch Sb, an output port of the first diode Db and a second port of the first inductor Lb, a second port of the switch Sb, An input port of the eighth diode Dm is connected, a first port of the first inductor Lb is connected to a second port of the photovoltaic string PV, and an output port of the eighth diode Dm is a first port of the inverter bridge arm circuit is connected, and a first port of the PV string PV is connected to a second port of the inverter bridge circuit;
所述逆变桥臂电路包括第二功率开关管S2、第三功率开关管S3、第四功率开关管S4、第五功率开关管S5、第六功率开关管S6、第七功率开关管S7、第二二极管D2、第三二极管D3、第四二极管D4、第五二极管D5、第六二极管D6、第七二极管D7，其中，所述第三功率开关管S3与第三二极管D3并联连接的第一端口、所述第五功率开关管S5与第五二极管D5并联连接的第一端口及所述第七功率开关管S7与第七二极管D7并联连接的第一端口连接，连接节点为所述逆变桥臂电路的第一端口；所述第二功率开关管S2与第二二极管D2并联连接的第二端口、所述第四功率开关管S4与第四二极管D4并联连接的第二端口及所述第六功率开关管S6与第六二极管D6并联连接的第二端口连接，连接节点为所述逆变桥臂电路的第二端口；The inverter bridge arm circuit includes a second power switch tube S2, a third power switch tube S3, a fourth power switch tube S4, a fifth power switch tube S5, a sixth power switch tube S6, and a seventh power switch tube S7. a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, and a seventh diode D7, wherein the third power switch a first port in which the tube S3 is connected in parallel with the third diode D3, a first port in which the fifth power switch tube S5 and the fifth diode D5 are connected in parallel, and the seventh power switch tube S7 and the seventh unit a first port connected in parallel with the pole tube D7, the connection node being a first port of the inverter bridge arm circuit; a second port in which the second power switch tube S2 is connected in parallel with the second diode D2, the a second port in which the fourth power switch S4 is connected in parallel with the fourth diode D4 and a second port in which the sixth power switch S6 and the sixth diode D6 are connected in parallel, and the connection node is the inverter a second port of the bridge arm circuit;
所述第二功率开关管S2与第二二极管D2并联连接的第一端口与所述第三功率开关管S3与第三二极管D3并联连接的第二端口、所述交流滤波电路的第一端口连接；所述第四功率开关管S4与第四二极管D4并联连接的第一端口与所述第五功率开关管S5与第五二极管D5并联连接的第二端口、所述交流滤波电路的第二端口连接；所述第六功率开关管S6与第六二极管D6并联连接的第一端口与所述第七功率开关管S7与第七二极管D7并联连接的第二端口、所述交流滤波电路的第三端口连接；a second port in which the second power switch S2 is connected in parallel with the second diode D2 and a second port in which the third power switch S3 and the third diode D3 are connected in parallel, and the AC filter circuit a first port is connected; a first port in which the fourth power switch S4 is connected in parallel with the fourth diode D4 and a second port in which the fifth power switch S5 and the fifth diode D5 are connected in parallel a second port of the AC filter circuit is connected; a first port in which the sixth power switch S6 and the sixth diode D6 are connected in parallel is connected in parallel with the seventh power switch S7 and the seventh diode D7. a second port, the third port of the AC filter circuit is connected;
所述交流滤波电路包括第二电容Ca、第三电容Cb、第四电容Cc、第二电感La、第三电感Lb、第四电感Lc，其中，所述第二电容Ca的第一端口与所述第二电感La的第一端口连接，连接节点为所述交流滤波电路的第一端口；所述第三电容Cb的第一端口与所述第三电感Lb的第一端口连接，连接节点 为所述交流滤波电路的第二端口；所述第四电容Cc的第一端口与所述第四电感Lc的第一端口连接，连接节点为所述交流滤波电路的第三端口；所述第二电感La的第二端口、第三电感Lb的第二端口、第四电感Lc的第二端口分别并入相应的交流电网。The AC filter circuit includes a second capacitor Ca, a third capacitor Cb, a fourth capacitor Cc, a second inductor La, a third inductor Lb, and a fourth inductor Lc, wherein the first port of the second capacitor Ca is a first port of the second inductor La is connected, the connection node is a first port of the AC filter circuit; a first port of the third capacitor Cb is connected to a first port of the third inductor Lb, and a connection node a second port of the fourth filter Cc; a first port of the fourth capacitor Cc is connected to a first port of the fourth inductor Lc, and a connection node is a third port of the AC filter circuit; The second port of the second inductor La, the second port of the third inductor Lb, and the second port of the fourth inductor Lc are respectively incorporated into a corresponding AC grid.
具体地，本发明实施例中的电流源逆变器是一种直流电流源输入的两级式三相电流源逆变器，它是在图4所示的直流电流源输入的单级式三相电流源逆变器的基础上，在光伏组串的直流电流源输入与三相逆变桥臂之间增加直流Boost升压变换器，直流升压变换器由开关管Sb、二极管Dm、及储能电感Lb构成，并且无需传统Boost变换器的直流母线电容，逆变电路与MCU数字控制策略与图4所示的直流电流源输入的单级式三相电流源逆变器相似。Specifically, the current source inverter in the embodiment of the present invention is a two-stage three-phase current source inverter with a DC current source input, which is a single-stage three input of the DC current source shown in FIG. Based on the phase current source inverter, a DC Boost boost converter is added between the DC current source input of the PV string and the three-phase inverter bridge arm, and the DC boost converter is composed of a switch tube Sb, a diode Dm, and The energy storage inductor Lb is constructed, and the DC bus capacitor of the conventional Boost converter is not needed. The inverter circuit and the MCU digital control strategy are similar to the single-stage three-phase current source inverter of the DC current source input shown in FIG.
其具体的三相电流源光伏逆变器的SPWN调制策略示意图请参阅图4-1所示的调制策略，本实施例不做赘述。For a schematic diagram of the SPWN modulation strategy of the specific three-phase current source photovoltaic inverter, refer to the modulation strategy shown in Figure 4-1, which is not described in this embodiment.
可以看出，本发明实施例中，光伏组串提供的直流电流经过直流储能电路的电感器滤波，采用功率二极管实现续流，以稳定的直流电流输入给逆变桥臂电路，控制器经过SPWM调制得到的开关驱动信号把输入给逆变桥臂电路的直流电流输入转换为交流电流SPWM方波输出，再经过电容器与电感器构成的交流滤波电路滤除高频纹波后得到正弦波电流，最终并入交流电网实现光伏并网发电。这种电流源逆变器无需使用直流母线电容器，也无需直流母线电压控制，通过重新构造逆变器的***架构，应用于光伏发电技术中有利于提升光伏发电***的发电量和工作效率，同时降低***成本。It can be seen that, in the embodiment of the present invention, the DC current provided by the PV string is filtered by the inductor of the DC energy storage circuit, and the power diode is used to realize the freewheeling, and the DC current is input to the inverter bridge arm circuit, and the controller passes through The switch drive signal obtained by SPWM modulation converts the DC current input input to the inverter bridge arm circuit into an AC current SPWM square wave output, and then extracts the sine wave current after filtering the high frequency ripple through the AC filter circuit formed by the capacitor and the inductor. Finally, it is integrated into the AC grid to realize photovoltaic grid-connected power generation. This current source inverter eliminates the need for DC bus capacitors and DC bus voltage control. By reconfiguring the system architecture of the inverter, it is beneficial to increase the power generation and work efficiency of the photovoltaic power generation system. Reduce system costs.
请参阅图9，图9是本发明第七实施例提供的一种电流源逆变器***的接线示意图，如图9所示，所述光伏组串PV包括N个串联的光伏组件；Referring to FIG. 9, FIG. 9 is a schematic diagram of wiring of a current source inverter system according to a seventh embodiment of the present invention. As shown in FIG. 9, the PV string PV includes N series photovoltaic modules;
所述直流储能电路包括第一电容、第一电感Lb、开关管、第一二极管Db以及第八二极管Dm，其中，所述第一电容的输入端口与所述光伏组串PV的第一端口连接，所述第一电容的输出端口与所述光伏组串PV的第二端口连接，所述第一电感Lb的的第一端口与所述光伏组串PV的第二端口连接，所述第一电感Lb的的第二端口与所述开关管的第二端口、所述第一二极管Db的输 出端口、所述第八二极管Dm的输入端口连接，所述第八二极管Dm的输出端口连接与所述逆变桥臂电路的第一端口连接，所述开关管的第一端口与所述第一二极管Db的输入端口、所述光伏组串PV的第一端口连接，所述光伏组串PV的第一端口与所述逆变桥臂电路的第二端口连接；The DC energy storage circuit includes a first capacitor, a first inductor Lb, a switch transistor, a first diode Db, and an eighth diode Dm, wherein the input port of the first capacitor and the PV string PV The first port is connected, the output port of the first capacitor is connected to the second port of the PV string PV, and the first port of the first inductor Lb is connected to the second port of the PV string PV a second port of the first inductor Lb and a second port of the switch tube, and the first diode Db An output port of the eighth diode Dm is connected to the output port, and an output port of the eighth diode Dm is connected to the first port of the inverter bridge circuit, and the first port of the switch tube Connected to the input port of the first diode Db, the first port of the PV string PV, and the first port of the PV string PV is connected to the second port of the inverter bridge circuit;
所述逆变桥臂电路包括第二功率开关管S2、第三功率开关管S3、第四功率开关管S4、第五功率开关管S5、第六功率开关管S6、第七功率开关管S7、第二二极管D2、第三二极管D3、第四二极管D4、第五二极管D5、第六二极管D6、第七二极管D7，其中，所述第三功率开关管S3与第三二极管D3并联连接的第一端口、所述第五功率开关管S5与第五二极管D5并联连接的第一端口及所述第七功率开关管S7与第七二极管D7并联连接的第一端口连接，连接节点为所述逆变桥臂电路的第一端口；所述第二功率开关管S2与第二二极管D2并联连接的第二端口、所述第四功率开关管S4与第四二极管D4并联连接的第二端口及所述第六功率开关管S6与第六二极管D6并联连接的第二端口连接，连接节点为所述逆变桥臂电路的第二端口；The inverter bridge arm circuit includes a second power switch tube S2, a third power switch tube S3, a fourth power switch tube S4, a fifth power switch tube S5, a sixth power switch tube S6, and a seventh power switch tube S7. a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, and a seventh diode D7, wherein the third power switch a first port in which the tube S3 is connected in parallel with the third diode D3, a first port in which the fifth power switch tube S5 and the fifth diode D5 are connected in parallel, and the seventh power switch tube S7 and the seventh unit a first port connected in parallel with the pole tube D7, the connection node being a first port of the inverter bridge arm circuit; a second port in which the second power switch tube S2 is connected in parallel with the second diode D2, the a second port in which the fourth power switch S4 is connected in parallel with the fourth diode D4 and a second port in which the sixth power switch S6 and the sixth diode D6 are connected in parallel, and the connection node is the inverter a second port of the bridge arm circuit;
所述第二功率开关管S2与第二二极管D2并联连接的第一端口与所述第三功率开关管S3与第三二极管D3并联连接的第二端口、所述交流滤波电路的第一端口连接；所述第四功率开关管S4与第四二极管D4并联连接的第一端口与所述第五功率开关管S5与第五二极管D5并联连接的第二端口、所述交流滤波电路的第二端口连接；所述第六功率开关管S6与第六二极管D6并联连接的第一端口与所述第七功率开关管S7与第七二极管D7并联连接的第二端口、所述交流滤波电路的第三端口连接；a second port in which the second power switch S2 is connected in parallel with the second diode D2 and a second port in which the third power switch S3 and the third diode D3 are connected in parallel, and the AC filter circuit a first port is connected; a first port in which the fourth power switch S4 is connected in parallel with the fourth diode D4 and a second port in which the fifth power switch S5 and the fifth diode D5 are connected in parallel a second port of the AC filter circuit is connected; a first port in which the sixth power switch S6 and the sixth diode D6 are connected in parallel is connected in parallel with the seventh power switch S7 and the seventh diode D7. a second port, the third port of the AC filter circuit is connected;
所述交流滤波电路包括第二电容Ca、第三电容Cb、第四电容Cc、第二电感La、第三电感Lb、第四电感Lc，其中，所述第二电容Ca的第一端口与所述第二电感La的第一端口连接，连接节点为所述交流滤波电路的第一端口；所述第三电容Cb的第一端口与所述第三电感Lb的第一端口连接，连接节点为所述交流滤波电路的第二端口；所述第四电容Cc的第一端口与所述第四电感Lc的第一端口连接，连接节点为所述交流滤波电路的第三端口；所述第二电感La的第二端口、第三电感Lb的第二端口、第四电感Lc的第二端口分别 并入相应的交流电网。The AC filter circuit includes a second capacitor Ca, a third capacitor Cb, a fourth capacitor Cc, a second inductor La, a third inductor Lb, and a fourth inductor Lc, wherein the first port of the second capacitor Ca is a first port of the second inductor La is connected, the connection node is a first port of the AC filter circuit; a first port of the third capacitor Cb is connected to a first port of the third inductor Lb, and the connection node is a second port of the AC filter circuit; a first port of the fourth capacitor Cc is connected to a first port of the fourth inductor Lc, and a connection node is a third port of the AC filter circuit; The second port of the inductor La, the second port of the third inductor Lb, and the second port of the fourth inductor Lc respectively Incorporate into the corresponding AC grid.
具体地，本发明实施例中的电流源逆变器是一种直流电压源输入的两级式三相电流源逆变器，它是在图5所示的直流电压源输入的单级式三相电流源逆变器的基础上，在光伏组串或其他直流电源提供的直流电压源输入与三相逆变桥臂之间增加直流Boost升压变换器，直流升压变换器由开关管Sb、二极管Dm、及储能电感Lb构成，并且无需传统Boost变换器的直流母线电容，逆变电路与MCU数字控制策略与图5所示的直流电压源输入的单级式三相电流源逆变器相似。Specifically, the current source inverter in the embodiment of the present invention is a two-stage three-phase current source inverter with a DC voltage source input, which is a single-stage three input of the DC voltage source shown in FIG. Based on the phase current source inverter, a DC Boost boost converter is added between the DC voltage source input provided by the PV string or other DC power source and the three-phase inverter bridge arm, and the DC boost converter is replaced by the switch tube Sb. , diode Dm, and energy storage inductor Lb, and does not need the DC bus capacitor of the traditional Boost converter, the inverter circuit and MCU digital control strategy and the single-stage three-phase current source inverter of the DC voltage source input shown in Figure 5. Similar to the device.
其具体的三相电流源光伏逆变器的SPWN调制策略示意图请参阅图4-1所示的调制策略，本实施例不做赘述。For a schematic diagram of the SPWN modulation strategy of the specific three-phase current source photovoltaic inverter, refer to the modulation strategy shown in Figure 4-1, which is not described in this embodiment.
可以看出，本发明实施例中，光伏组串提供的直流电流经过直流储能电路的电感器滤波，采用功率二极管实现续流，以稳定的直流电流输入给逆变桥臂电路，控制器经过SPWM调制得到的开关驱动信号把输入给逆变桥臂电路的直流电流输入转换为交流电流SPWM方波输出，再经过电容器与电感器构成的交流滤波电路滤除高频纹波后得到正弦波电流，最终并入交流电网实现光伏并网发电。这种电流源逆变器无需使用直流母线电容器，也无需直流母线电压控制，通过重新构造逆变器的***架构，应用于光伏发电技术中有利于提升光伏发电***的发电量和工作效率，同时降低***成本。It can be seen that, in the embodiment of the present invention, the DC current provided by the PV string is filtered by the inductor of the DC energy storage circuit, and the power diode is used to realize the freewheeling, and the DC current is input to the inverter bridge arm circuit, and the controller passes through The switch drive signal obtained by SPWM modulation converts the DC current input input to the inverter bridge arm circuit into an AC current SPWM square wave output, and then extracts the sine wave current after filtering the high frequency ripple through the AC filter circuit formed by the capacitor and the inductor. Finally, it is integrated into the AC grid to realize photovoltaic grid-connected power generation. This current source inverter eliminates the need for DC bus capacitors and DC bus voltage control. By reconfiguring the system architecture of the inverter, it is beneficial to increase the power generation and work efficiency of the photovoltaic power generation system. Reduce system costs.
请参阅图10，图10是本发明第八实施例提供的电流源逆变器***构成的多级并联光伏发电***的接线示意图，如图10所示，由n个具有独立光伏组串电流源输入的三相电流源光伏并网逆变器构成三相多机并联光伏发电***，n个三相电流源光伏逆变器分别采用独立的调制策略。每个三相电流源逆变器的输出为电流源特性，多机并联能力强，从而无需专用并机通讯信号与通讯线缆，提高光伏***的可靠性。另外，电流源输入可改换为电压源输入、三相逆变器也可改换为单相逆变器，而具有相似的***功能与性能。Please refer to FIG. 10. FIG. 10 is a schematic diagram of wiring of a multi-stage parallel photovoltaic power generation system composed of a current source inverter system according to an eighth embodiment of the present invention. As shown in FIG. 10, n independent photovoltaic string current sources are provided. The input three-phase current source photovoltaic grid-connected inverter constitutes a three-phase multi-machine parallel photovoltaic power generation system, and the n three-phase current source photovoltaic inverters respectively adopt independent modulation strategies. The output of each three-phase current source inverter is current source characteristic, and the multi-machine parallel capability is strong, so that no special parallel communication signal and communication cable are needed, and the reliability of the photovoltaic system is improved. In addition, the current source input can be changed to a voltage source input, and the three-phase inverter can also be changed to a single-phase inverter with similar system functions and performance.
请参阅图11，图11是本发明第九实施例提供的一种单台电流源逆变器系 统内部的多路MPPT结构的接线示意图，如图11所示，单台三相电流源光伏并网逆变器内部由n个具有独立光伏组串电流源输入的单级式三相电流源逆变及相应的交流滤波电路构成，并且采用同一套MCU软件控制与调制策略，从而完成光伏并网发电及多路MPPT跟踪功能。另外，电流源输入可改换为电压源输入、三相逆变器也可改换为单相逆变器，而具有相似的***功能与性能。Please refer to FIG. 11. FIG. 11 is a single current source inverter system according to a ninth embodiment of the present invention. Schematic diagram of the internal multi-channel MPPT structure, as shown in Figure 11, a single three-phase current source photovoltaic grid-connected inverter is internally reversed by n single-stage three-phase current sources with independent PV string current source inputs. The configuration of the corresponding AC filter circuit is changed, and the same MCU software control and modulation strategy is adopted, thereby completing the photovoltaic grid-connected power generation and multi-channel MPPT tracking function. In addition, the current source input can be changed to a voltage source input, and the three-phase inverter can also be changed to a single-phase inverter with similar system functions and performance.
请参阅图12，图12是本发明第十实施例提供的另一种单台电流源逆变器***内部的多路MPPT结构的接线示意图，如图12所示，单台三相电流源光伏并网逆变器内部由n个具有独立光伏组串电流源输入的单级式三相电流源逆变电路构成，并且采用同一套总交流滤波电路、及MCU软件控制与调制策略，从而完成光伏并网发电及多路MPPT跟踪功能。另外，电流源输入可改换为电压源输入、三相逆变器也可改换为单相逆变器，而具有相似的***功能与性能。Referring to FIG. 12, FIG. 12 is a schematic diagram of wiring of a multi-channel MPPT structure in another single current source inverter system according to a tenth embodiment of the present invention. As shown in FIG. 12, a single three-phase current source photovoltaic is shown. The grid-connected inverter consists of n single-stage three-phase current source inverter circuits with independent PV string current source input, and uses the same set of total AC filter circuit and MCU software control and modulation strategy to complete the PV. Grid-connected power generation and multi-channel MPPT tracking. In addition, the current source input can be changed to a voltage source input, and the three-phase inverter can also be changed to a single-phase inverter with similar system functions and performance.
请参阅图13，图13是本发明第十一实施例提供的另一种单台电流源逆变器***内部的多路MPPT结构的接线示意图，如图13所示，单台三相电流源光伏并网逆变器内部由n个具有独立光伏组串电流源输入的两级式三相电流源逆变及相应的交流滤波电路构成，两级式三相电流源逆变器由直流Boost升压变换器与DC/AC逆变电路组成，并且采用同一套MCU软件控制与调制策略，从而完成光伏并网发电及多路MPPT跟踪功能，同时光伏组串的直流输入电压可以更宽。另外，电流源输入可改换为电压源输入、Boost升压变换器可改换为其他隔离或非隔离型的DC/DC变换器、三相逆变器也可改换为单相逆变器，而具有相似的***功能与性能。Referring to FIG. 13, FIG. 13 is a schematic diagram of wiring of a multi-channel MPPT structure in another single current source inverter system according to an eleventh embodiment of the present invention. As shown in FIG. 13, a single three-phase current source is shown. The photovoltaic grid-connected inverter consists of two two-phase three-phase current source inverters with independent PV string current source input and corresponding AC filter circuit. The two-stage three-phase current source inverter is DC Boost. The voltage converter is composed of a DC/AC inverter circuit, and adopts the same MCU software control and modulation strategy to complete the photovoltaic grid-connected power generation and multi-channel MPPT tracking function, and the DC input voltage of the PV string can be wider. In addition, the current source input can be changed to a voltage source input, the Boost boost converter can be changed to other isolated or non-isolated DC/DC converters, and the three-phase inverter can also be replaced with a single-phase inverter. Similar system features and performance.
请参阅图14，图14是本发明第十二实施例提供的另一种单台电流源逆变器***内部的多路MPPT结构的接线示意图，如图14所示，单台三相电流源光伏并网逆变器内部由n个具有独立光伏组串电流源输入的直流Boost升压变换器、及同一套单级式三相电流源逆变及交流滤波电路构成，并且采用同一套 MCU软件控制与调制策略，从而完成光伏并网发电及多路MPPT跟踪功能，同时光伏组串的直流输入电压可以更宽。另外，电流源输入可改换为电压源输入、Boost升压变换器可改换为其他隔离或非隔离型的DC/DC变换器、三相逆变器也改换改为单相逆变器，而具有相似的***功能与性能。Referring to FIG. 14, FIG. 14 is a schematic diagram of wiring of a multi-channel MPPT structure in another single current source inverter system according to a twelfth embodiment of the present invention. As shown in FIG. 14, a single three-phase current source is shown. The photovoltaic grid-connected inverter is composed of n DC Boost boost converters with independent PV string current source input, and the same set of single-stage three-phase current source inverter and AC filter circuit, and adopts the same set. MCU software control and modulation strategy to complete photovoltaic grid-connected power generation and multi-channel MPPT tracking function, while the DC input voltage of the PV string can be wider. In addition, the current source input can be changed to a voltage source input, the Boost boost converter can be changed to other isolated or non-isolated DC/DC converters, and the three-phase inverter is also changed to a single-phase inverter. Similar system features and performance.
请参阅图15，图15是本发明第十三实施例提供的一种单个光伏组串时的电流源逆变器***交错并联的接线示意图，如图15所示，单个光伏组串电流源输入时三相电流源光伏并网逆变器内部由n个单级式三相电流源逆变及相应的交流滤波电路构成，并且采用同一套MCU软件控制与移相调制策略，从而完成光伏并网发电及交错并联功能。这种交错并联方式可减小输入、输出电流纹波，从而降低磁性器件损耗、提高***工作效率。另外，电流源输入可改换为电压源输入、三相逆变器也可改换为单相逆变器，而具有相似的***功能与性能。Referring to FIG. 15, FIG. 15 is a schematic diagram showing the interleaving and parallel connection of a current source inverter system in a single photovoltaic string according to a thirteenth embodiment of the present invention. As shown in FIG. 15, a single photovoltaic string current source input is shown. The three-phase current source photovoltaic grid-connected inverter is composed of n single-stage three-phase current source inverters and corresponding AC filter circuits, and adopts the same MCU software control and phase shift modulation strategy to complete photovoltaic grid connection. Power generation and interleaved parallel function. This staggered parallel approach reduces input and output current ripple, which reduces magnetic device losses and increases system efficiency. In addition, the current source input can be changed to a voltage source input, and the three-phase inverter can also be changed to a single-phase inverter with similar system functions and performance.
请参阅图16，图16是本发明第十四实施例提供的另一种单个光伏组串时的电流源逆变器***交错并联的接线示意图，如图16所示，单个光伏组串电流源输入时三相电流源光伏并网逆变器内部由n个单级式三相电流源逆变电路构成，并且采用同一套总交流滤波电路、及MCU软件控制与移相调制策略，从而完成光伏并网发电及交错并联功能。这种交错并联方式可减小输入、输出电流纹波，同时还可以实现输出的多电平工作，从而进一步降低磁性器件损耗、提高***工作效率。另外，电流源输入可改换为电压源输入、三相逆变器也可改换为单相逆变器，而具有相似的***功能与性能。Please refer to FIG. 16. FIG. 16 is a schematic diagram showing the interleaving and parallel connection of a current source inverter system in another single photovoltaic string according to the fourteenth embodiment of the present invention. As shown in FIG. 16, a single photovoltaic string current source is shown. The input three-phase current source photovoltaic grid-connected inverter is composed of n single-stage three-phase current source inverter circuits, and uses the same set of total AC filter circuit, MCU software control and phase shift modulation strategy to complete the photovoltaic Grid-connected power generation and interleaved parallel function. This interleaved parallel mode reduces input and output current ripple, and also enables multi-level operation of the output, thereby further reducing magnetic device losses and improving system efficiency. In addition, the current source input can be changed to a voltage source input, and the three-phase inverter can also be changed to a single-phase inverter with similar system functions and performance.
请参阅图17，图17是本发明第十五实施例提供的又一种单个光伏组串时的电流源逆变器***交错并联的接线示意图，如图17所示，单个光伏组串电流源输入时三相电流源光伏并网逆变器内部由n个两级式三相电流源逆变及相应的交流滤波电路构成，两级式三相电流源逆变器由直流Boost升压变换器与DC/AC逆变电路组成，并且采用同一套MCU软件控制与移相调制策略， 从而完成光伏并网发电及交错并联功能。这种交错并联方式可减小输入、输出电流纹波，从而降低磁性器件损耗、提高***工作效率。另外，电流源输入可改换为电压源输入、三相逆变器也可改换为单相逆变器，而具有相似的***功能与性能。Referring to FIG. 17, FIG. 17 is a schematic diagram showing the interleaving and parallel connection of a current source inverter system according to another fifteenth embodiment of the present invention, as shown in FIG. 17, a single photovoltaic string current source. The input three-phase current source photovoltaic grid-connected inverter is composed of n two-stage three-phase current source inverter and corresponding AC filter circuit, and the two-stage three-phase current source inverter is composed of DC Boost boost converter. It is composed of DC/AC inverter circuit and adopts the same MCU software control and phase shift modulation strategy. Thereby completing photovoltaic grid-connected power generation and staggered parallel function. This staggered parallel approach reduces input and output current ripple, which reduces magnetic device losses and increases system efficiency. In addition, the current source input can be changed to a voltage source input, and the three-phase inverter can also be changed to a single-phase inverter with similar system functions and performance.
请参阅图18，图18是本发明第十六实施例提供的再一种单个光伏组串时的电流源逆变器***交错并联的接线示意图，如图18所示，单个光伏组串电流源输入时三相电流源光伏并网逆变器内部由n个直流Boost升压变换器、及同一套单级式三相电流源逆变及交流滤波电路构成，并且采用同一套MCU软件控制与移相调制策略，从而完成光伏并网发电及交错并联功能。这种交错并联方式可减小输入电流纹波，从而降低磁性器件损耗、提高***工作效率。另外，电流源输入可改换为电压源输入、三相逆变器也可改换为单相逆变器，而具有相似的***功能与性能。Referring to FIG. 18, FIG. 18 is a schematic diagram of the staggered parallel connection of the current source inverter system in the case of another single photovoltaic string according to the sixteenth embodiment of the present invention. As shown in FIG. 18, a single photovoltaic string current source is shown. The input three-phase current source photovoltaic grid-connected inverter is composed of n DC Boost boost converters, and the same set of single-stage three-phase current source inverter and AC filter circuit, and uses the same set of MCU software to control and shift. Phase modulation strategy to complete photovoltaic grid-connected power generation and interleaved parallel function. This staggered parallel approach reduces input current ripple, which reduces magnetic device losses and increases system efficiency. In addition, the current source input can be changed to a voltage source input, and the three-phase inverter can also be changed to a single-phase inverter with similar system functions and performance.
请参阅图19，图19是本发明第十七实施例提供的电流源逆变器***耦合电感结构的接线示意图，如图19所示，单个光伏组串电流源输入时三相电流源光伏并网逆变器内部由n个单级式三相电流源逆变及相应的交流滤波电路构成，并且采用同一套MCU软件控制与移相调制策略，同时n个直流储能电感器与交流滤波电感器使用耦合电感结构，从而完成光伏并网发电及交错并联与耦合电感功能。这种方式可减小输入、输出电流纹波、及减小磁性器件的重量与体积，从而降低磁性器件损耗、提高***工作效率。另外，电流源输入可改换为电压源输入、三相逆变器可改换为单相逆变器，或者单个光伏组串电流源逆变器结构也可改换为单台三相电流源光伏并网逆变器内部的多个电流源逆变电路，而具有相似的***功能与性能。Referring to FIG. 19, FIG. 19 is a schematic diagram of the wiring structure of the coupled inductor structure of the current source inverter system according to the seventeenth embodiment of the present invention. As shown in FIG. 19, a single photovoltaic string current source is input when the three-phase current source is photovoltaic. The network inverter is composed of n single-stage three-phase current source inverters and corresponding AC filter circuits, and adopts the same MCU software control and phase shift modulation strategy, and at the same time, n DC energy storage inductors and AC filter inductors. The coupled inductor structure is used to complete photovoltaic grid-connected power generation and interleaved parallel and coupled inductor functions. This method can reduce the input and output current ripple, and reduce the weight and volume of the magnetic device, thereby reducing the loss of the magnetic device and improving the system working efficiency. In addition, the current source input can be changed to a voltage source input, the three-phase inverter can be changed to a single-phase inverter, or a single photovoltaic string current source inverter structure can also be changed to a single three-phase current source photovoltaic grid-connected Multiple current source inverter circuits inside the inverter have similar system functions and performance.
其中，本发明第四实施例及第五实施例中的电流源逆变器***，也可应用于图10至图19所示的结构中，本发明实施例不做任何限制。The current source inverter system in the fourth embodiment and the fifth embodiment of the present invention can also be applied to the structure shown in FIG. 10 to FIG. 19, and the embodiment of the present invention does not impose any limitation.
另外，本发明实施例还提供了一种光伏发电装置，其特征在于，包括如本 发明图3至图19所示的任意一实施例所述的电流源逆变器***。其中，所述逆变装置用于使用电流源逆变器***的应用中，所述逆变装置包括以下一种或几种：光伏发电装置、不间断电源、变频电源及通信逆变器。In addition, an embodiment of the present invention further provides a photovoltaic power generation device, which is characterized by A current source inverter system according to any of the embodiments shown in FIGS. 3 to 19 is invented. Wherein, the inverter device is used in an application using a current source inverter system, and the inverter device comprises one or more of the following: a photovoltaic power generation device, an uninterruptible power supply, a variable frequency power supply, and a communication inverter.
以上所揭露的仅为本发明的较佳实施例而已，当然不能以此来限定本发明之权利范围，本领域普通技术人员可以理解实现上述实施例的全部或部分流程，并依本发明权利要求所作的等同变化，仍属于发明所涵盖的范围。 The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and those skilled in the art can understand all or part of the process of implementing the above embodiments, and according to the claims of the present invention. Equivalent changes made are still within the scope of the invention.

Claims (11)

  1. 一种电流源逆变器***，其特征在于，包括：直流储能电路、逆变桥臂电路、交流滤波电路、控制器，其中，所述直流储能电路与光伏组串电连接，所述直流储能电路与所述逆变桥臂电路电连接，所述逆变桥臂电路与所述交流滤波电路电连接，所述控制器与所述逆变桥臂电路电连接，所述控制器用于控制所述逆变桥臂电路的工作；A current source inverter system, comprising: a DC energy storage circuit, an inverter bridge arm circuit, an AC filter circuit, and a controller, wherein the DC energy storage circuit is electrically connected to a photovoltaic group, The DC energy storage circuit is electrically connected to the inverter bridge arm circuit, the inverter bridge arm circuit is electrically connected to the AC filter circuit, and the controller is electrically connected to the inverter bridge arm circuit, and the controller uses Controlling the operation of the inverter bridge arm circuit;
    其中，所述直流储能电路将所述光伏组串提供的直流电流进行储能、滤波形成稳定的直流电流，并将所述稳定的直流电流输入给所述逆变桥臂电路，所述逆变桥臂电路将所述稳定的直流电流转换为交流电流、并输出给所述交流滤波电路，所述交流滤波电路将所述交流电流转换为正弦波电流，最终并入交流电网实现光伏并网发电。The DC energy storage circuit stores and filters a DC current provided by the PV string to form a stable DC current, and inputs the stable DC current to the inverter bridge circuit, the inverse The variable bridge arm circuit converts the stable direct current into an alternating current and outputs the same to the alternating current filter circuit, and the alternating current filter circuit converts the alternating current into a sinusoidal current, and finally merges into an alternating current grid to realize photovoltaic grid connection. Power generation.
  2. 如权利要求1所述的电流源逆变器***，其特征在于，The current source inverter system of claim 1 wherein:
    所述控制器具体用于实现基于正弦脉宽调制得到的功率开关管驱动信号控制所述逆变桥臂电路，以将由所述直流储能电路输入的稳定的直流电流转换为交流电流输出。The controller is specifically configured to implement the power switch tube driving signal obtained based on the sinusoidal pulse width modulation to control the inverter bridge arm circuit to convert the stable DC current input by the DC energy storage circuit into an AC current output.
  3. 如权利要求2所述的电流源逆变器***，其特征在于，The current source inverter system of claim 2 wherein:
    所述光伏组串包括N个串联的光伏组件；The photovoltaic string comprises N series of photovoltaic components;
    所述直流储能电路包括第一二极管和第一电感，其中，所述第一二极管的输入端口与所述光伏组串的第一端口连接，所述第一二极管的输出端口与所述光伏组串的第二端口连接，所述第一电感的的第一端口与所述光伏组串的第二端口连接，所述第一电感的的第二端口与所述逆变桥臂电路的第一端口连接，所述光伏组串的第一端口与所述逆变桥臂电路的第二端口连接；The DC energy storage circuit includes a first diode and a first inductor, wherein an input port of the first diode is connected to a first port of the photovoltaic string, and an output of the first diode a port is connected to the second port of the PV string, a first port of the first inductor is connected to a second port of the PV string, and a second port of the first inductor is connected to the inverter a first port of the bridge arm circuit is connected, and a first port of the PV string is connected to a second port of the inverter bridge circuit;
    所述逆变桥臂电路包括第二功率开关管、第三功率开关管、第四功率开关管、第五功率开关管、第六功率开关管、第七功率开关管、第二二极管、第三二极管、第四二极管、第五二极管、第六二极管、第七二极管，其中，所述第 三功率开关管与第三二极管并联连接的第一端口、所述第五功率开关管与第五二极管并联连接的第一端口及所述第七功率开关管与第七二极管并联连接的第一端口连接，连接节点为所述逆变桥臂电路的第一端口；所述第二功率开关管与第二二极管并联连接的第二端口、所述第四功率开关管与第四二极管并联连接的第二端口及所述第六功率开关管与第六二极管并联连接的第二端口连接，连接节点为所述逆变桥臂电路的第二端口；The inverter bridge arm circuit includes a second power switch tube, a third power switch tube, a fourth power switch tube, a fifth power switch tube, a sixth power switch tube, a seventh power switch tube, and a second diode. a third diode, a fourth diode, a fifth diode, a sixth diode, and a seventh diode, wherein the a first port in which the three power switch tube is connected in parallel with the third diode, a first port in which the fifth power switch tube and the fifth diode are connected in parallel, and the seventh power switch tube and the seventh diode a first port connected in parallel, the connection node is a first port of the inverter bridge arm circuit; a second port in which the second power switch tube is connected in parallel with the second diode, the fourth power switch tube a second port connected in parallel with the fourth diode and the sixth power switch tube is connected to a second port connected in parallel with the sixth diode, and the connection node is a second port of the inverter bridge arm circuit;
    所述第二功率开关管与第二二极管并联连接的第一端口与所述第三功率开关管与第三二极管并联连接的第二端口、所述交流滤波电路的第一端口连接；所述第四功率开关管与第四二极管并联连接的第一端口与所述第五功率开关管与第五二极管并联连接的第二端口、所述交流滤波电路的第二端口连接；所述第六功率开关管与第六二极管并联连接的第一端口与所述第七功率开关管与第七二极管并联连接的第二端口、所述交流滤波电路的第三端口连接；a first port in parallel connection between the second power switch tube and the second diode is connected to a second port in which the third power switch tube is connected in parallel with the third diode, and a first port of the AC filter circuit is connected a first port in parallel connection of the fourth power switch tube and the fourth diode, a second port connected in parallel with the fifth power switch tube and the fifth diode, and a second port of the AC filter circuit a second port in which the sixth power switch tube is connected in parallel with the sixth diode and a second port in which the seventh power switch tube and the seventh diode are connected in parallel, and a third port of the AC filter circuit Port connection
    所述交流滤波电路包括第二电容、第三电容、第四电容、第二电感、第三电感、第四电感，其中，所述第二电容的第一端口与所述第二电感的第一端口连接，连接节点为所述交流滤波电路的第一端口；所述第三电容的第一端口与所述第三电感的第一端口连接，连接节点为所述交流滤波电路的第二端口；所述第四电容的第一端口与所述第四电感的第一端口连接，连接节点为所述交流滤波电路的第三端口；所述第二电感的第二端口、第三电感的第二端口、第四电感的第二端口分别并入相应的交流电网。The AC filter circuit includes a second capacitor, a third capacitor, a fourth capacitor, a second inductor, a third inductor, and a fourth inductor, wherein the first port of the second capacitor and the first of the second inductor a port is connected, the connection node is a first port of the AC filter circuit; a first port of the third capacitor is connected to a first port of the third inductor, and a connection node is a second port of the AC filter circuit; The first port of the fourth capacitor is connected to the first port of the fourth inductor, the connection node is the third port of the AC filter circuit, the second port of the second inductor, and the second port of the third inductor The port, the second port of the fourth inductor is respectively incorporated into the corresponding AC grid.
  4. 如权利要求2所述的电流源逆变器***，其特征在于，The current source inverter system of claim 2 wherein:
    所述光伏组串包括N个串联的光伏组件；The photovoltaic string comprises N series of photovoltaic components;
    所述直流储能电路包括第一电容和第一电感，其中，所述第一电容的输入端口与所述光伏组串的第一端口连接，所述第一电容的输出端口与所述光伏组串的第二端口连接，所述第一电感的的第一端口与所述光伏组串的第二端口连接，所述第一电感的的第二端口与所述逆变桥臂电路的第一端口连接，所述光伏组串的第一端口与所述逆变桥臂电路的第二端口连接；The DC energy storage circuit includes a first capacitor and a first inductor, wherein an input port of the first capacitor is connected to a first port of the PV string, an output port of the first capacitor and the PV group a second port of the string is connected, a first port of the first inductor is connected to a second port of the photovoltaic string, a second port of the first inductor is first with a first circuit of the inverter bridge circuit a port connection, a first port of the photovoltaic string is connected to a second port of the inverter bridge circuit;
    所述逆变桥臂电路包括第二功率开关管、第三功率开关管、第四功率开关 管、第五功率开关管、第六功率开关管、第七功率开关管、第二二极管、第三二极管、第四二极管、第五二极管、第六二极管、第七二极管，其中，所述第三功率开关管与第三二极管并联连接的第一端口、所述第五功率开关管与第五二极管并联连接的第一端口及所述第七功率开关管与第七二极管并联连接的第一端口连接，连接节点为所述逆变桥臂电路的第一端口；所述第二功率开关管与第二二极管并联连接的第二端口、所述第四功率开关管与第四二极管并联连接的第二端口及所述第六功率开关管与第六二极管并联连接的第二端口连接，连接节点为所述逆变桥臂电路的第二端口；The inverter bridge arm circuit includes a second power switch tube, a third power switch tube, and a fourth power switch a tube, a fifth power switch tube, a sixth power switch tube, a seventh power switch tube, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode, wherein the third port in which the third power switch is connected in parallel with the third diode, the first port in which the fifth power switch is connected in parallel with the fifth diode, and the The seventh power switch tube is connected to the first port connected in parallel with the seventh diode, the connection node is the first port of the inverter bridge arm circuit; the second power switch tube is connected in parallel with the second diode a second port, a second port in which the fourth power switch tube is connected in parallel with the fourth diode, and a second port in which the sixth power switch tube is connected in parallel with the sixth diode, and the connection node is the a second port of the inverter bridge arm circuit;
    所述第二功率开关管与第二二极管并联连接的第一端口与所述第三功率开关管与第三二极管并联连接的第二端口、所述交流滤波电路的第一端口连接；所述第四功率开关管与第四二极管并联连接的第一端口与所述第五功率开关管与第五二极管并联连接的第二端口、所述交流滤波电路的第二端口连接；所述第六功率开关管与第六二极管并联连接的第一端口与所述第七功率开关管与第七二极管并联连接的第二端口、所述交流滤波电路的第三端口连接；a first port in parallel connection between the second power switch tube and the second diode is connected to a second port in which the third power switch tube is connected in parallel with the third diode, and a first port of the AC filter circuit is connected a first port in parallel connection of the fourth power switch tube and the fourth diode, a second port connected in parallel with the fifth power switch tube and the fifth diode, and a second port of the AC filter circuit a second port in which the sixth power switch tube is connected in parallel with the sixth diode and a second port in which the seventh power switch tube and the seventh diode are connected in parallel, and a third port of the AC filter circuit Port connection
    所述交流滤波电路包括第二电容、第三电容、第四电容、第二电感、第三电感、第四电感，其中，所述第二电容的第一端口与所述第二电感的第一端口连接，连接节点为所述交流滤波电路的第一端口；所述第三电容的第一端口与所述第三电感的第一端口连接，连接节点为所述交流滤波电路的第二端口；所述第四电容的第一端口与所述第四电感的第一端口连接，连接节点为所述交流滤波电路的第三端口；所述第二电感的第二端口、第三电感的第二端口、第四电感的第二端口分别并入相应的交流电网。The AC filter circuit includes a second capacitor, a third capacitor, a fourth capacitor, a second inductor, a third inductor, and a fourth inductor, wherein the first port of the second capacitor and the first of the second inductor a port is connected, the connection node is a first port of the AC filter circuit; a first port of the third capacitor is connected to a first port of the third inductor, and a connection node is a second port of the AC filter circuit; The first port of the fourth capacitor is connected to the first port of the fourth inductor, the connection node is the third port of the AC filter circuit, the second port of the second inductor, and the second port of the third inductor The port, the second port of the fourth inductor is respectively incorporated into the corresponding AC grid.
  5. 如权利要求2所述的电流源逆变器***，其特征在于，The current source inverter system of claim 2 wherein:
    所述光伏组串包括N个串联的光伏组件；The photovoltaic string comprises N series of photovoltaic components;
    所述直流储能电路包括第一二极管和第一电感，其中，所述第一二极管的输入端口与所述光伏组串的第一端口连接，所述第一二极管的输出端口与所述光伏组串的第二端口连接，所述第一电感的的第一端口与所述光伏组串的第二端口连接，所述第一电感的的第二端口与所述逆变桥臂电路的第一端口连接， 所述光伏组串的第一端口与所述逆变桥臂电路的第二端口连接；The DC energy storage circuit includes a first diode and a first inductor, wherein an input port of the first diode is connected to a first port of the photovoltaic string, and an output of the first diode a port is connected to the second port of the PV string, a first port of the first inductor is connected to a second port of the PV string, and a second port of the first inductor is connected to the inverter The first port of the bridge arm circuit is connected, The first port of the photovoltaic string is connected to the second port of the inverter bridge circuit;
    所述逆变桥臂电路包括第二功率开关管、第三功率开关管、第四功率开关管、第五功率开关管、第二二极管、第三二极管、第四二极管、第五二极管，其中，所述第二功率开关管与第二二极管并联连接的第二端口与所述第四功率开关管与第四二极管并联连接的第二端口连接，连接节点为所述逆变桥臂电路的第二端口；所述第三功率开关管与第三二极管并联连接的第一端口与所述第五功率开关管与第五二极管并联连接的第一端口连接，连接节点为所述逆变桥臂电路的第一端口；The inverter bridge arm circuit includes a second power switch tube, a third power switch tube, a fourth power switch tube, a fifth power switch tube, a second diode, a third diode, a fourth diode, a fifth diode, wherein the second port in which the second power switch tube is connected in parallel with the second diode is connected to the second port in which the fourth power switch tube and the fourth diode are connected in parallel, and is connected a node is a second port of the inverter bridge arm circuit; a first port in which the third power switch tube is connected in parallel with the third diode is connected in parallel with the fifth power switch tube and the fifth diode a first port connected, the connection node being a first port of the inverter bridge arm circuit;
    所述第二功率开关管与第二二极管并联连接的第一端口与所述第三功率开关管与第三二极管并联连接的第二端口、所述交流滤波电路的第一端口连接；所述第四功率开关管与第四二极管并联连接的第一端口与所述第五功率开关管与第五二极管并联连接的第二端口、所述交流滤波电路的第二端口连接；a first port in parallel connection between the second power switch tube and the second diode is connected to a second port in which the third power switch tube is connected in parallel with the third diode, and a first port of the AC filter circuit is connected a first port in parallel connection of the fourth power switch tube and the fourth diode, a second port connected in parallel with the fifth power switch tube and the fifth diode, and a second port of the AC filter circuit connection;
    所述交流滤波电路包括第二电容、第二电感、第三电感，其中，所述第二电容的第一端口与所述第二电感的第一端口连接，连接节点为所述交流滤波电路的第一端口；所述第二电容的第二端口与所述第三电感的第一端口连接，连接节点为所述交流滤波电路的第二端口；所述第二电感的第二端口、第三电感的第二端口连接所述交流电网。The AC filter circuit includes a second capacitor, a second inductor, and a third inductor, wherein the first port of the second capacitor is connected to the first port of the second inductor, and the connection node is the AC filter circuit a first port; a second port of the second capacitor is connected to the first port of the third inductor, the connection node is a second port of the AC filter circuit; and a second port and a third port of the second inductor A second port of the inductor is coupled to the AC grid.
  6. 如权利要求2所述的电流源逆变器***，其特征在于，The current source inverter system of claim 2 wherein:
    所述光伏组串包括N个串联的光伏组件；The photovoltaic string comprises N series of photovoltaic components;
    所述直流储能电路包括第一电容和第一电感，其中，所述第一电容的输入端口与所述光伏组串的第一端口连接，所述第一电容的输出端口与所述光伏组串的第二端口连接，所述第一电感的的第一端口与所述光伏组串的第二端口连接，所述第一电感的的第二端口与所述逆变桥臂电路的第一端口连接，所述光伏组串的第一端口与所述逆变桥臂电路的第二端口连接；The DC energy storage circuit includes a first capacitor and a first inductor, wherein an input port of the first capacitor is connected to a first port of the PV string, an output port of the first capacitor and the PV group a second port of the string is connected, a first port of the first inductor is connected to a second port of the photovoltaic string, a second port of the first inductor is first with a first circuit of the inverter bridge circuit a port connection, a first port of the photovoltaic string is connected to a second port of the inverter bridge circuit;
    所述逆变桥臂电路包括第二功率开关管、第三功率开关管、第四功率开关管、第五功率开关管、第二二极管、第三二极管、第四二极管、第五二极管，其中，所述第二功率开关管与第二二极管并联连接的第二端口与所述第四功率 开关管与第四二极管并联连接的第二端口连接，连接节点为所述逆变桥臂电路的第二端口；所述第三功率开关管与第三二极管并联连接的第一端口与所述第五功率开关管与第五二极管并联连接的第一端口连接，连接节点为所述逆变桥臂电路的第一端口；The inverter bridge arm circuit includes a second power switch tube, a third power switch tube, a fourth power switch tube, a fifth power switch tube, a second diode, a third diode, a fourth diode, a fifth diode, wherein the second power switch is connected to the second port and the fourth power in parallel with the second diode The switch tube is connected to the second port connected in parallel with the fourth diode, the connection node is the second port of the inverter bridge arm circuit; the first port of the third power switch tube and the third diode are connected in parallel a first port connected in parallel with the fifth power switch tube and the fifth diode, wherein the connection node is a first port of the inverter bridge arm circuit;
    所述第二功率开关管与第二二极管并联连接的第一端口与所述第三功率开关管与第三二极管并联连接的第二端口、所述交流滤波电路的第一端口连接；所述第四功率开关管与第四二极管并联连接的第一端口与所述第五功率开关管与第五二极管并联连接的第二端口、所述交流滤波电路的第二端口连接；a first port in parallel connection between the second power switch tube and the second diode is connected to a second port in which the third power switch tube is connected in parallel with the third diode, and a first port of the AC filter circuit is connected a first port in parallel connection of the fourth power switch tube and the fourth diode, a second port connected in parallel with the fifth power switch tube and the fifth diode, and a second port of the AC filter circuit connection;
    所述交流滤波电路包括第二电容、第二电感、第三电感，其中，所述第二电容的第一端口与所述第二电感的第一端口连接，连接节点为所述交流滤波电路的第一端口；所述第二电容的第二端口与所述第三电感的第一端口连接，连接节点为所述交流滤波电路的第二端口；所述第二电感的第二端口、第三电感的第二端口连接所述交流电网。The AC filter circuit includes a second capacitor, a second inductor, and a third inductor, wherein the first port of the second capacitor is connected to the first port of the second inductor, and the connection node is the AC filter circuit a first port; a second port of the second capacitor is connected to the first port of the third inductor, the connection node is a second port of the AC filter circuit; and a second port and a third port of the second inductor A second port of the inductor is coupled to the AC grid.
  7. 如权利要求2所述的电流源逆变器***，其特征在于，The current source inverter system of claim 2 wherein:
    所述光伏组串包括N个串联的光伏组件；The photovoltaic string comprises N series of photovoltaic components;
    所述直流储能电路包括第一二极管、第一电感、第八二极管、开关管，其中，所述第一二极管的输入端口与所述光伏组串的第一端口、所述开关管的第一端口连接，所述第一二极管的输出端口与所述第一电感的的第二端口、所述开关的第二端口、所述第八二极管的输入端口连接，所述第一电感的的第一端口与所述所光伏组串的第二端口连接，所述第八二极管的输出端口与所述逆变桥臂电路的第一端口连接，所述光伏组串的第一端口与所述逆变桥臂电路的第二端口连接；The DC energy storage circuit includes a first diode, a first inductor, an eighth diode, and a switch tube, wherein an input port of the first diode and a first port of the photovoltaic string Connecting the first port of the switch tube, the output port of the first diode is connected to the second port of the first inductor, the second port of the switch, and the input port of the eighth diode a first port of the first inductor is connected to a second port of the photovoltaic string, and an output port of the eighth diode is connected to a first port of the inverter bridge circuit, a first port of the photovoltaic string is connected to a second port of the inverter bridge circuit;
    所述逆变桥臂电路包括第二功率开关管、第三功率开关管、第四功率开关管、第五功率开关管、第六功率开关管、第七功率开关管、第二二极管、第三二极管、第四二极管、第五二极管、第六二极管、第七二极管，其中，所述第三功率开关管与第三二极管并联连接的第一端口、所述第五功率开关管与第五二极管并联连接的第一端口及所述第七功率开关管与第七二极管并联连接的 第一端口连接，连接节点为所述逆变桥臂电路的第一端口；所述第二功率开关管与第二二极管并联连接的第二端口、所述第四功率开关管与第四二极管并联连接的第二端口及所述第六功率开关管与第六二极管并联连接的第二端口连接，连接节点为所述逆变桥臂电路的第二端口；The inverter bridge arm circuit includes a second power switch tube, a third power switch tube, a fourth power switch tube, a fifth power switch tube, a sixth power switch tube, a seventh power switch tube, and a second diode. a third diode, a fourth diode, a fifth diode, a sixth diode, and a seventh diode, wherein the third power switch tube is connected in parallel with the third diode a port, a first port in which the fifth power switch tube and the fifth diode are connected in parallel, and a seventh power switch tube and a seventh diode are connected in parallel a first port is connected, the connection node is a first port of the inverter bridge arm circuit; the second port of the second power switch tube is connected in parallel with the second diode, the fourth power switch tube and the fourth a second port in which the diodes are connected in parallel, and a sixth port in which the sixth power switch tube is connected in parallel with the sixth diode, and the connection node is a second port of the inverter bridge arm circuit;
    所述第二功率开关管与第二二极管并联连接的第一端口与所述第三功率开关管与第三二极管并联连接的第二端口、所述交流滤波电路的第一端口连接；所述第四功率开关管与第四二极管并联连接的第一端口与所述第五功率开关管与第五二极管并联连接的第二端口、所述交流滤波电路的第二端口连接；所述第六功率开关管与第六二极管并联连接的第一端口与所述第七功率开关管与第七二极管并联连接的第二端口、所述交流滤波电路的第三端口连接；a first port in parallel connection between the second power switch tube and the second diode is connected to a second port in which the third power switch tube is connected in parallel with the third diode, and a first port of the AC filter circuit is connected a first port in parallel connection of the fourth power switch tube and the fourth diode, a second port connected in parallel with the fifth power switch tube and the fifth diode, and a second port of the AC filter circuit a second port in which the sixth power switch tube is connected in parallel with the sixth diode and a second port in which the seventh power switch tube and the seventh diode are connected in parallel, and a third port of the AC filter circuit Port connection
    所述交流滤波电路包括第二电容、第三电容、第四电容、第二电感、第三电感、第四电感，其中，所述第二电容的第一端口与所述第二电感的第一端口连接，连接节点为所述交流滤波电路的第一端口；所述第三电容的第一端口与所述第三电感的第一端口连接，连接节点为所述交流滤波电路的第二端口；所述第四电容的第一端口与所述第四电感的第一端口连接，连接节点为所述交流滤波电路的第三端口；所述第二电感的第二端口、第三电感的第二端口、第四电感的第二端口分别并入相应的交流电网。The AC filter circuit includes a second capacitor, a third capacitor, a fourth capacitor, a second inductor, a third inductor, and a fourth inductor, wherein the first port of the second capacitor and the first of the second inductor a port is connected, the connection node is a first port of the AC filter circuit; a first port of the third capacitor is connected to a first port of the third inductor, and a connection node is a second port of the AC filter circuit; The first port of the fourth capacitor is connected to the first port of the fourth inductor, the connection node is the third port of the AC filter circuit, the second port of the second inductor, and the second port of the third inductor The port, the second port of the fourth inductor is respectively incorporated into the corresponding AC grid.
  8. 如权利要求2所述的电流源逆变器***，其特征在于，The current source inverter system of claim 2 wherein:
    所述光伏组串包括N个串联的光伏组件；The photovoltaic string comprises N series of photovoltaic components;
    所述直流储能电路包括第一电容、第一电感、开关管、第一二极管以及第八二极管，其中，所述第一电容的输入端口与所述光伏组串的第一端口连接，所述第一电容的输出端口与所述光伏组串的第二端口连接，所述第一电感的的第一端口与所述光伏组串的第二端口连接，所述第一电感的的第二端口与所述开关管的第二端口、所述第一二极管的输出端口、所述第八二极管的输入端口连接，所述第八二极管的输出端口连接与所述逆变桥臂电路的第一端口连接，所述开关管的第一端口与所述第一二极管的输入端口、所述光伏组串的第一端口连接，所述光伏组串的第一端口与所述逆变桥臂电路的第二端口连接； The DC energy storage circuit includes a first capacitor, a first inductor, a switch tube, a first diode, and an eighth diode, wherein an input port of the first capacitor and a first port of the PV string Connecting, the output port of the first capacitor is connected to the second port of the PV string, and the first port of the first inductor is connected to the second port of the PV string, the first inductor The second port is connected to the second port of the switch tube, the output port of the first diode, the input port of the eighth diode, and the output port of the eighth diode is connected a first port connection of the inverter bridge arm circuit, a first port of the switch tube is connected to an input port of the first diode, a first port of the PV string, and a a port is connected to the second port of the inverter bridge arm circuit;
    所述逆变桥臂电路包括第二功率开关管、第三功率开关管、第四功率开关管、第五功率开关管、第六功率开关管、第七功率开关管、第二二极管、第三二极管、第四二极管、第五二极管、第六二极管、第七二极管，其中，所述第三功率开关管与第三二极管并联连接的第一端口、所述第五功率开关管与第五二极管并联连接的第一端口及所述第七功率开关管与第七二极管并联连接的第一端口连接，连接节点为所述逆变桥臂电路的第一端口；所述第二功率开关管与第二二极管并联连接的第二端口、所述第四功率开关管与第四二极管并联连接的第二端口及所述第六功率开关管与第六二极管并联连接的第二端口连接，连接节点为所述逆变桥臂电路的第二端口；The inverter bridge arm circuit includes a second power switch tube, a third power switch tube, a fourth power switch tube, a fifth power switch tube, a sixth power switch tube, a seventh power switch tube, and a second diode. a third diode, a fourth diode, a fifth diode, a sixth diode, and a seventh diode, wherein the third power switch tube is connected in parallel with the third diode a port, a first port in which the fifth power switch tube and the fifth diode are connected in parallel, and a first port in which the seventh power switch tube is connected in parallel with the seventh diode, and the connection node is the inverter a first port of the bridge arm circuit; a second port in which the second power switch tube is connected in parallel with the second diode; a second port in which the fourth power switch tube and the fourth diode are connected in parallel, and the The sixth power switch tube is connected to the second port connected in parallel with the sixth diode, and the connection node is the second port of the inverter bridge arm circuit;
    所述第二功率开关管与第二二极管并联连接的第一端口与所述第三功率开关管与第三二极管并联连接的第二端口、所述交流滤波电路的第一端口连接；所述第四功率开关管与第四二极管并联连接的第一端口与所述第五功率开关管与第五二极管并联连接的第二端口、所述交流滤波电路的第二端口连接；所述第六功率开关管与第六二极管并联连接的第一端口与所述第七功率开关管与第七二极管并联连接的第二端口、所述交流滤波电路的第三端口连接；a first port in parallel connection between the second power switch tube and the second diode is connected to a second port in which the third power switch tube is connected in parallel with the third diode, and a first port of the AC filter circuit is connected a first port in parallel connection of the fourth power switch tube and the fourth diode, a second port connected in parallel with the fifth power switch tube and the fifth diode, and a second port of the AC filter circuit a second port in which the sixth power switch tube is connected in parallel with the sixth diode and a second port in which the seventh power switch tube and the seventh diode are connected in parallel, and a third port of the AC filter circuit Port connection
    所述交流滤波电路包括第二电容、第三电容、第四电容、第二电感、第三电感、第四电感，其中，所述第二电容的第一端口与所述第二电感的第一端口连接，连接节点为所述交流滤波电路的第一端口；所述第三电容的第一端口与所述第三电感的第一端口连接，连接节点为所述交流滤波电路的第二端口；所述第四电容的第一端口与所述第四电感的第一端口连接，连接节点为所述交流滤波电路的第三端口；所述第二电感的第二端口、第三电感的第二端口、第四电感的第二端口分别并入相应的交流电网。The AC filter circuit includes a second capacitor, a third capacitor, a fourth capacitor, a second inductor, a third inductor, and a fourth inductor, wherein the first port of the second capacitor and the first of the second inductor a port is connected, the connection node is a first port of the AC filter circuit; a first port of the third capacitor is connected to a first port of the third inductor, and a connection node is a second port of the AC filter circuit; The first port of the fourth capacitor is connected to the first port of the fourth inductor, the connection node is the third port of the AC filter circuit, the second port of the second inductor, and the second port of the third inductor The port, the second port of the fourth inductor is respectively incorporated into the corresponding AC grid.
  9. 如权利要求3、4、7、8中任一项所述的电流源逆变器***，其特征在于，所述控制器具体用于控制所述电流源逆变器***中所述逆变桥臂电路的功率开关管采用120°轮换导通工作模式，任意桥臂上、下管1/3区间为高频开关、2/3区间为低频工作，任意时刻只有一相桥臂高频工作、其他两相桥臂低频工作，以将由所述直流储能电路输入的稳定的直流电流转换为交流电流输出。 The current source inverter system according to any one of claims 3, 4, 7, and 8, wherein the controller is specifically configured to control the inverter bridge in the current source inverter system The power switch tube of the arm circuit adopts the 120° rotation conduction working mode. The upper and lower tubes of any bridge arm are high frequency switches in the 1/3 interval, and the low frequency operation is performed in the 2/3 interval. Only one phase bridge arm operates at high frequency at any time. The other two-phase bridge arms operate at low frequencies to convert the stable DC current input by the DC tank circuit into an AC current output.
  10. 一种逆变装置，其特征在于，包括如权利要求1-9任意一项所述的电流源逆变器***。An inverter device comprising the current source inverter system according to any one of claims 1-9.
  11. 如权利要求10所述的逆变装置，其特征在于，所述逆变装置用于使用电流源逆变器***的应用中，所述逆变装置包括以下一种或几种：光伏发电装置、不间断电源、变频电源及通信逆变器。 The inverter device according to claim 10, wherein the inverter device is used in an application using a current source inverter system, the inverter device comprising one or more of the following: a photovoltaic power generation device, Uninterruptible power supply, variable frequency power supply and communication inverter.
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CN111512532A (en) * 2017-12-21 2020-08-07 艾思玛太阳能技术股份公司 Converter for at least one converter module of three bridge branches, method for operating such a converter and use of such a converter
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CN113364314A (en) * 2021-04-26 2021-09-07 湖南大学 Single-stage three-phase 3MPPT type photovoltaic inverter and control strategy thereof
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CN115459620A (en) * 2022-09-28 2022-12-09 杭州铂科电子有限公司 Novel power converter
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