CN110247421B - Modular double-active-bridge converter system and electric quantity balance control method - Google Patents
Modular double-active-bridge converter system and electric quantity balance control method Download PDFInfo
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- 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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H02J3/386—
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- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
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- 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
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses a modularized double-active-bridge converter system which comprises a left part, a middle part and a right part, wherein the middle part is electrically connected with the left part, the right part is electrically connected with the middle part, the left part comprises a plurality of DC/AC inverters, the input ends of the DC/AC inverters are sequentially connected in parallel, the middle part comprises a plurality of medium-high frequency transformers, the right part comprises a plurality of AC/DC rectifiers, the output ends of the AC/DC rectifiers are sequentially connected in series, and a group of double-active-bridge converter modules are formed by one DC/AC inverter, one medium-high frequency transformer and one AC/DC rectifier. By adopting the technical scheme, the balance control of the series-parallel combined system containing more modules can be realized without information communication among the modules, and the voltage dynamic response of the serial ports of the modules can be kept consistent, thereby being beneficial to the stable operation of the whole combined system.
Description
Technical Field
The invention belongs to the technical field of control of a modular double-active-bridge converter, and particularly relates to a modular double-active-bridge converter system and an electric quantity balance control method.
Background
The structure schematic diagram of the modularized double-active-bridge converter is shown in fig. 1, and the modularized double-active-bridge converter is formed by cascading a plurality of identical double-active-bridge converters as basic modules, wherein ports on one side of each module are connected in parallel, and ports on the other side of each module are connected in series in sequence, the modularized double-active-bridge converter can realize conversion between direct-current voltages with different voltage grades, and has the characteristics of bidirectional power flow and electrical isolation on two sides.
According to the structure of the modularized double-active-bridge converter, the voltages of the parallel ports of the basic modules are equal, and the currents of the serial ports are equal. In order to realize the balance of the electric quantity of each module, balance control needs to be added to ensure that the currents of the parallel ports are basically equal or the voltages of the serial ports are basically equal, the existing balance control method mostly needs information communication among the modules, so that the system cost is increased and the reliability is reduced; another conventional balancing control method is to use one module to control the voltage of the parallel port of the module to be near a rated value by fine-tuning the active power of each module, and the other modules to control the voltages of the respective series ports to be basically balanced; the equalization control method is widely applied to the modular double-active-bridge converter with a small number of modules and does not depend on information communication among the modules, but when the number of the modules is remarkably increased, the voltage of a parallel port connected with a large number of modules in parallel is difficult to control by only one module, so that the equalization control effect is remarkably reduced, and the existing equalization control method cannot realize the equalization control of the electrical quantity of the modules of the modular double-active-bridge converter with a large number of modules under the condition of no information communication among the modules.
Disclosure of Invention
The invention aims to solve the defect that the existing balance control method can not realize the module electrical quantity balance control technology of a modular double-active-bridge converter with a large number of modules under the condition of no information communication among the modules, and provides a method for controlling the module electrical quantity balance among the modules of the modular double-active-bridge converter, wherein one double-active-bridge converter is used as one module, the structures and the parameters of the modules are basically the same, one side port (such as an input port) of each module is connected in parallel, the other side port (such as an output port) of each module is connected in series to form a combined system shown in a figure 1, and the active power transmitted by each module is actively controlled to realize the current balance among the parallel ports of each module and the voltage balance among the serial ports of each module.
In order to achieve the technical purpose, the invention provides a technical scheme that the modularized double-active-bridge converter system comprises a left part, a middle part and a right part, wherein the middle part is electrically connected with the left part, the right part is electrically connected with the middle part, the left part comprises a plurality of DC/AC inverters, the input ends of the DC/AC inverters are sequentially connected in parallel, the middle part comprises a plurality of medium-high frequency transformers, the right part comprises a plurality of AC/DC rectifiers, the output ends of the AC/DC rectifiers are sequentially connected in series, and a group of double-active-bridge converter modules is formed by one DC/AC inverter, one medium-high frequency transformer and one AC/DC rectifier.
In the scheme, the left side of the modular dual-active-bridge converter system is electrically connected with a direct current device, wherein the direct current device can be a direct current power supply, a direct current load or an idle device, and the direct current power supply comprises a photovoltaic battery power supply, an energy storage battery or an alternating current generator processor-side AC/DC rectifier and the like. The double-active-bridge converter is used as a module, the structure and parameters of each module are basically the same, one side port (such as an input port) of each module is connected in parallel, the other side port (such as an output port) of each module is connected in series to form a combined system shown in the figure 1, and the current balance of the parallel ports of each module and the voltage balance of the serial ports of the modules are realized by actively controlling the active power transmitted by each module.
And the input end of the DC/AC inverter is connected with a filter capacitor in parallel.
And the output end of the AC/DC rectifier is connected with a filter capacitor in parallel.
The number of the direct current equipment is equal to that of the double active bridge converters.
The DC/AC inverter and the AC/DC rectifier are both of three-phase six-bridge-arm structures.
A method for controlling electrical quantity balance among modules of a modular double-active-bridge converter is suitable for a modular double-active-bridge converter system and is used for a module combination system with input ports connected in parallel and output ports connected in series or a modular double-active-bridge converter with input ports connected in series and output ports connected in parallel. The active power instruction value (or the instruction value of the control quantity in positive correlation with the active power) transmitted by each module is determined by the following proportional-integral control law:
P*＝kp'e+ki'∫edt；
wherein k isp' and ki' proportional coefficient and integral coefficient in proportional-integral based control, respectively, e is an error signal, and the error signal e is selected as follows:
wherein k isaAnd kbAre respectively two constants, coefficient kaThe empirical value of (A) is in the range of 0.3-0.7, the corresponding kbIs taken as (1-k)a)，UotAnd
actual voltage and rated voltage of the series port of the tth module, respectively; u shapeiAnd
actual voltage and rated voltage of the parallel port of the tth module respectively;
under the continuous action of an integral link in proportional-integral control, the value of an error signal e is controlled to be zero, and the expression is as follows:
the voltage of the serial port and the voltage of the parallel port of each module have the following relationship in a steady state:
in the scheme, the balance control method is effective when the power flows from the left side to the right side and also effective when the power flows from the right side to the left side, the voltage of the serial port of each module and the voltage of the parallel port of each module have the same proportional relation, and the voltage of the serial port of each module can be kept balanced under the balance control action; since the currents at the series ports of the modules are always equal, the voltages at the series ports of the respective modules remaining balanced means that the power of the respective modules also remains balanced. It should be noted that, under the equalizing control method of the present invention, the equalizing control rules of each module are the same, so that it can be ensured that the dynamic responses of the modules are substantially consistent.
The invention has the beneficial effects that: according to the modularized double-active-bridge converter system and the electric quantity balance control method, balance control of a series-parallel combination system with a plurality of modules can be achieved without information communication among the modules, dynamic voltage responses of series ports of the modules can be kept consistent, and stable operation of the whole combination system is facilitated.
Drawings
Fig. 1 is a schematic structural diagram of a modular dual-active-bridge converter.
Fig. 2 is a schematic structural diagram of a modular dual-active-bridge converter system according to the present invention.
Fig. 3 is a first schematic diagram of response waveforms of a modular dual-active-bridge converter using a conventional module electrical quantity balancing control method.
Fig. 4 is a schematic diagram of a response waveform of a modular dual-active-bridge converter adopting a conventional module electrical quantity balancing control method.
Fig. 5 is a first schematic diagram of a response waveform of a modular dual-active-bridge converter using the module electrical quantity balancing control method of the present invention.
Fig. 6 is a schematic diagram of a response waveform of the modular dual-active-bridge converter adopting the module electrical quantity balancing control method of the present invention.
The notation in the figure is: the system comprises a 1-wind driven generator, a 2-terminal AC/DC rectifier, a 3-modular double-active-bridge converter, a 4-grid-terminal DC/AC inverter, a 31 left component, a 32-middle component and a 33-right component.
Detailed Description
For the purpose of better understanding the objects, technical solutions and advantages of the present invention, the following detailed description of the present invention with reference to the accompanying drawings and examples should be understood that the specific embodiment described herein is only a preferred embodiment of the present invention, and is only used for explaining the present invention, and not for limiting the scope of the present invention, and all other embodiments obtained by a person of ordinary skill in the art without making creative efforts shall fall within the scope of the present invention.
Example (b): as shown in fig. 1: the utility model provides a two active bridge converter systems of modularization, is including left side part 31, middle part 32 and right part 33, middle part 32 is connected with left side part 31 electricity, right part 33 is connected with middle part 32 electricity, left side part 31 includes a plurality of DC AC inverters, the input of a plurality of DC AC inverters is parallelly connected in proper order, middle part 32 includes a plurality of medium-high frequency transformers, right part 33 is including a plurality of AC DC rectifiers, the output of a plurality of AC DC rectifiers is established ties in proper order, and a DC AC inverter, a medium-high frequency transformer and an AC DC rectifier constitute a set of two active bridge converter modules.
As shown in fig. 2, a modular dual-active-bridge converter system for grid connection of a wind farm, 20 wind power generators 1 and a modular dual-active-bridge converter 3; each wind driven generator 1 is connected with an AC/DC rectifier 2 at the generator end, and the AC/DC rectifier is of a three-phase six-bridge-arm structure; the direct current output end of the AC/DC Converter is connected to a double-Active-Bridge Converter (Dual-Active-Bridge Converter); the left part 31 of one double-active-bridge converter is a DC/AC inverter, the right part 33 is an AC/DC rectifier which are all of a three-phase six-bridge-arm structure, and the middle part 32 of the one double-active-bridge converter is a medium-frequency or high-frequency transformer; the double-active-bridge converter is used as a basic module of the modularized double-active-bridge converter 3, the left side ports of the double-active-bridge converter are connected in parallel, the right side ports of the double-active-bridge converter are sequentially connected in series, the output end of the double-active-bridge converter is electrically connected with the input end of a DC/AC inverter 4 at a power grid end through a cable, and the output end of the DC/AC inverter 4 is electrically connected with an AC power grid end.
The inverter of the double-active-bridge converter is controlled by using common vector current, and the active power and the reactive power of the inverter are controlled at command values; the rectifier of the double-active bridge converter adopts the commonly used vector current control or direct voltage control to control the alternating voltage at the alternating current side of the rectifier at a command value, the control method of the double-active bridge converter belongs to the prior art, the method for controlling the electrical quantity balance among the modules of the modularized double-active bridge converter 3 adopts the method provided by the invention, namely, the active power command value of the inverter in each double-active bridge converter module adopts the command value in the invention, and the reactive power command value can be selected from 0; the AC voltage command value of the rectifier in each module can be selected to be a rated value.
The active power instruction value (or the instruction value of the control quantity in positive correlation with the active power) transmitted by each module is determined by the following proportional-integral control law:
P*＝kp'e+ki'∫edt；
wherein k isp' and ki' proportional coefficient and integral coefficient in proportional-integral based control, respectively, e is an error signal, and the error signal e is selected as follows:
wherein k isaAnd kbAre respectively two constants, coefficient kaThe empirical value of (A) is in the range of 0.3-0.7, the corresponding kbIs taken as (1-k)a)，UotAnd
actual voltage and rated voltage of the series port of the tth module, respectively; u shapeiAnd
actual voltage and rated voltage of the parallel port of the tth module respectively;
under the continuous action of an integral link in proportional-integral control, the value of an error signal e is controlled to be zero, and the expression is as follows:
the voltage of the serial port and the voltage of the parallel port of each module have the following relationship in a steady state:
for dynamic response of a test system, 20 wind driven generators 1 are divided into 4 groups, wherein the front 3 groups are respectively provided with the wind driven generators 1, and the wind speed condition of the wind driven generators 1 in each group is equal to the generated wind power; the 4 th group only has 2 wind driven generators 1, and all the wind driven generators are in a shutdown state and do not generate wind power. In this way, the wind power generator 1 in the test system generates unbalanced power, and can be used to test the dynamic response of the modular dual-active-bridge converter 3 under different module balancing control methods.
Fig. 3 and 4 are schematic response waveforms of a modular dual active bridge converter using a conventional module balancing control method, in which the 1 st wind turbine 1 is used for controlling the voltage of the parallel port, and the rest wind turbines 1 are used for controlling the voltage of the series port. Fig. 3(a) is the power generated by the 1 st wind turbine 1 in the first 3 groups of wind turbines 1, fig. 3(b) is the parallel port voltage of each module, fig. 3(c) is the series port voltage of each module, and fig. 3(d) is the active power generated by the entire wind farm. Fig. 4(a), (b), (c) and (d) are power profiles of each module in group 1, group 2, group 3 and group 4, respectively. From the system response, it can be found that the dynamic response of the 1 st wind turbine 1, that is, the wind turbine 1 controlling the voltage of the parallel port, is greatly different from the dynamic responses of the remaining wind turbines 1, which indicates that the conventional equilibrium control method is not suitable for the modular dual-active-bridge converter 3 with a large number of modules.
Fig. 5 and 6 are response waveforms of a modular dual active bridge converter using the module balancing control method of the present invention. Each wind driven generator 1 adopts the same balance control method to participate in the control of the voltage of the parallel port and the voltage of the serial port. Fig. 5(a) is the power generated by the 1 st wind turbine 1 in the first 3 groups of wind turbines 1, fig. 5(b) is the parallel port voltage of each module, fig. 5(c) is the series port voltage of each module, and fig. 5(d) is the active power generated by the entire wind farm. Fig. 6(a), (b), (c) and (d) are power profiles of each module in group 1, group 2, group 3 and group 4, respectively. The system response shows that the voltage and power dynamic response consistency of each wind driven generator 1 is better under the same wind power condition, which shows that the balance control method of the invention can better realize the balance control of the electrical quantity between the modules of the modularized double-active-bridge converter 3, and the control method does not need the communication between the modules.
It should be noted that the terms "left", "middle", "right", and the like in the description indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and do not indicate or imply specific orientations or positions that the illustrated devices or elements must have, and therefore, the present invention should not be construed as being limited.
The above-mentioned embodiments are preferred embodiments of the modular dual-active-bridge converter system and the electrical balance control method of the present invention, and the scope of the present invention is not limited thereto, and the scope of the present invention includes and is not limited thereto, and all equivalent changes made according to the shape and structure of the present invention are within the protection scope of the present invention.
Claims (4)
1. A method for controlling the balance of electrical quantity between modules of a modular double-active-bridge converter is suitable for a modular double-active-bridge converter system, the modular dual active bridge converter system comprises a left part (31), a middle part (32) and a right part (33), the middle part (32) is electrically connected to the left part (31), the right part (33) is electrically connected to the middle part (32), the left part (31) comprises a plurality of DC/AC inverters, the input ends of the plurality of DC/AC inverters are connected in parallel in sequence, the middle part (32) comprises a plurality of medium-high frequency transformers, the right part (33) comprises a plurality of AC/DC rectifiers, the output ends of the AC/DC rectifiers are sequentially connected in series, and a DC/AC inverter, a medium-high frequency transformer and an AC/DC rectifier form a group of double-active-bridge converter modules; the method is characterized in that: the active power instruction value transmitted by each module is determined by the following proportional-integral control law:
P*＝kp'e+ki'∫edt；
wherein k isp' and ki' proportional coefficient and integral coefficient in proportional-integral based control, respectively, e is an error signal, and the error signal e is selected as follows:
wherein k isaAnd kbAre respectively two constants, coefficient kaThe empirical value of (A) is in the range of 0.3-0.7, the corresponding kbIs taken as (1-k)a)，UotAnd
actual voltage and rated voltage of the series port of the tth module, respectively; u shapeiAnd
actual voltage and rated voltage of the parallel port of the tth module respectively;
under the continuous action of an integral link in proportional-integral control, the value of an error signal e is controlled to be zero, and the expression is as follows:
the voltage of the serial port and the voltage of the parallel port of each module have the following relationship in a steady state:
2. the method for controlling electrical quantity balance among modules of the modular dual-active-bridge converter according to claim 1, wherein: and the output end of the AC/DC rectifier is connected with a filter capacitor in parallel.
3. The method for controlling electrical quantity balance among modules of the modular dual-active-bridge converter according to claim 1, wherein: and the input end of the DC/AC inverter is connected with a filter capacitor in parallel.
4. The method for controlling electrical quantity balance among modules of the modular dual-active-bridge converter according to claim 1, wherein: the DC/AC inverter and the AC/DC rectifier are both of three-phase six-bridge-arm structures.
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| CN111355256A (en) | 2020-03-09 | 2020-06-30 | 台达电子企业管理（上海）有限公司 | High-voltage direct-current power transformation device, power system and control method of power system |
| CN111628490A (en) * | 2020-04-01 | 2020-09-04 | 国网浙江省电力有限公司湖州供电公司 | Direct current transformer substation based on modularized double-active-bridge converter |
| CN115800766B (en) * | 2023-01-30 | 2023-05-05 | 广东电网有限责任公司肇庆供电局 | Model reference self-adaptive control method and device based on double active bridge converters |
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| 基于MMC的高压大功率DC/DC变换器拓扑与控制策略研究;索之闻;《中国博士学位论文全文数据库工程科技II辑》;20171215(第12期);第13-22页 * |
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