CN210927109U - Energy storage converter and static var generator all-in-one, low pressure distribution station - Google Patents

Energy storage converter and static var generator all-in-one, low pressure distribution station Download PDF

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Publication number
CN210927109U
CN210927109U CN201922118371.0U CN201922118371U CN210927109U CN 210927109 U CN210927109 U CN 210927109U CN 201922118371 U CN201922118371 U CN 201922118371U CN 210927109 U CN210927109 U CN 210927109U
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China
Prior art keywords
circuit
energy storage
static var
var generator
storage converter
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CN201922118371.0U
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Inventor
孙久军
孙树强
王洋
刘爱忠
孙永亮
黄德旭
李伟生
任士康
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Shandong luruan Digital Technology Co.,Ltd. smart energy branch
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State Grid Intelligent Technology Co Ltd
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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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10—Flexible AC transmission systems [FACTS]
    • 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
    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/14—Energy storage units

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  • Supply And Distribution Of Alternating Current (AREA)
  • Inverter Devices (AREA)

Abstract

The utility model discloses an energy storage converter and static var generator all-in-one, low pressure distribution station, include: the alternating current circuit breaker, the first alternating current contactor, the LCL alternating current filter circuit, the inverter circuit, the direct current filter circuit and the direct current side switch circuit are sequentially connected in series, the two ends of the first alternating current contactor are connected with the power-on buffer circuit in parallel, and the direct current side switch circuit is connected with the storage battery pack; the AC side switch circuit is connected with a commercial power grid or a local AC load. The utility model discloses in gathering the function of two kinds of equipment of energy storage converter (PCS) and Static Var Generator (SVG) to an equipment. The power consumption of the equipment during operation is reduced, the investment of the equipment is reduced, and the space occupied by the equipment is saved.

Description

Energy storage converter and static var generator all-in-one, low pressure distribution station
Technical Field
The utility model relates to an energy storage and static idle emergence technical field especially relate to an energy storage converter and static idle generator all-in-one, low pressure distribution station.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, an energy storage converter is used for controlling the charging and discharging processes of a storage battery, performing alternating current and direct current conversion, and discharging the storage battery into an alternating current power supply under the condition of no power grid; under the condition of being connected with a power grid, the alternating current of the power grid can be converted into direct current, and the storage battery is charged; the direct current of the battery pack can be inverted into alternating current with the same frequency and phase as the power grid, and the electric energy is transmitted to the power grid.
And the static reactive generator is used for calculating the reactive power required by the power grid check point according to the acquired information of the power grid and the requirements and outputting the reactive power to the power grid. The method has the advantages of high response speed up to ms level and stepless adjustable compensation capacity.
The energy storage converter and the static reactive generator are both power electronic devices formed by adopting power electronic technology, a fast switching device, a fast Digital Signal Processor (DSP), advanced control, sampling and other technologies, and the technologies used by the energy storage converter and the static reactive generator are more general.
At present, energy storage technology and requirements are rising, and an energy storage converter can only solve the conversion of active electric energy; the static var generator SVG can only solve the problem of reactive compensation and has no capability and weakness for active transmission required by a power grid.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides an energy storage converter and static var generator all-in-one, low pressure distribution station can realize energy storage converter (PCS) and static var generator (SVG)'s function simultaneously, also can realize the arbitrary combination of PCS and SVG function, can be respectively according to the corresponding capacity of two kinds of function full load output.
In some embodiments, the following technical scheme is adopted:
an energy storage converter and static var generator all-in-one machine comprising: the alternating current circuit breaker, the first alternating current contactor, the LCL alternating current filter circuit, the inverter circuit, the direct current filter circuit and the direct current side switch circuit are sequentially connected in series, the two ends of the first alternating current contactor are connected with the power-on buffer circuit in parallel, and the direct current side switch circuit is connected with the storage battery pack; the AC side switch circuit is connected with a commercial power grid or a local AC load.
Further, still include: the controller is connected with the signal acquisition device; the controller is also connected with the inverter circuit through the driving circuit.
Further, still include: and a CAN \ RS485 communication circuit connected with the controller realizes the electrical isolation of the system and an external communication object by adopting a photoelectric coupling mode.
Further, still include: and the human-computer interaction unit and the controller realize information interaction through an MODBUS communication protocol.
Further, the power-up buffer circuit includes: the resistor R is connected in series with the second AC contactor.
Further, the inverter circuit is a three-phase full-bridge inverter circuit.
Further, the dc filter circuit includes: the electrolytic capacitor comprises capacitor groups connected in series, wherein each capacitor group comprises a plurality of electrolytic capacitors connected in parallel.
Furthermore, the level output signal of the controller pin is amplified and then connected with an intermediate relay, and the switch of the first alternating current contactor is controlled to be switched on and switched off through a normally open contact of the intermediate relay.
Furthermore, any one of the functions of the grid-connected converter and the static var generator can be taken as a main function, and if the surplus capacity exists after the functions are completed, the other function is realized; or, only one of the two functions is implemented; different working modes can be directly switched by issuing instructions.
In other embodiments, the following technical solutions are adopted:
a low voltage distribution substation comprising: the energy storage converter and static var generator all-in-one machine is provided.
Compared with the prior art, the beneficial effects of the utility model are that:
the functions of two devices, namely an energy storage converter (PCS) and a Static Var Generator (SVG), are integrated into one device. The power consumption of the equipment during operation is reduced, the investment of the equipment is reduced, and the space occupied by the equipment is saved.
The selection can be made according to the demand between two kinds of functions of energy storage converter and static var generator, can select arbitrary function, also can select arbitrary function priority, can realize seamless switching between the function setting of difference.
Drawings
Fig. 1 is a schematic structural composition diagram of an energy storage converter and static var generator all-in-one machine according to an embodiment of the present invention;
fig. 2 is a primary connection diagram of an energy storage converter and static var generator integrated machine according to an embodiment of the present invention;
fig. 3 is a logic position diagram of the energy storage converter and the static var generator all-in-one machine in the power station in the first embodiment of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example one
In one or more embodiments, an energy storage converter and static var generator all-in-one machine is disclosed, and with reference to fig. 1, the energy storage converter and static var generator all-in-one machine comprises: the device comprises an alternating current switch consisting of an alternating current connection breaker QF1 and an alternating current contactor KM1, an electrifying buffer circuit consisting of a resistor and a contactor which are connected in series, an LCL alternating current filter circuit, a three-phase full-bridge inverter circuit consisting of IGBT modules, a direct current filter circuit consisting of electrolytic capacitors, a lightning protection circuit FV, a direct current side switch circuit and a direct current side external storage battery.
The alternating current connection breaker QF1, the alternating current contactor KM1, the LCL alternating current filter circuit, the three-phase full-bridge inverter circuit, the direct current filter circuit and the direct current side switch circuit are sequentially connected in series, and the two ends of the alternating current contactor KM1 are connected with the power-on buffer circuit in parallel.
The IGBT switch of the three-phase full-bridge inverter circuit is driven by a driving circuit, the driving circuit is connected with a core control board, the driving circuit receives an IGBT switch control signal of the core control board, the IGBT switch control signal is amplified and isolated to drive the IGBT, and a high-frequency transformer is adopted to generate a direct-current isolation power supply. The chip ACPL-331 is used for processing the logic operation of the driving signal. The driving circuit also has an IGBT protection function and can feed back the fault state of the IGBT to the main control board.
In this embodiment, the core control board is a TMS320F28335DSP chip. Of course, those skilled in the art may select other chips to implement the method according to actual needs.
The core control panel is also connected with a CAN \ RS485 communication circuit, a signal acquisition processing circuit and a man-machine; the CAN \ RS485 communication circuit realizes two serial communication functions of CAN and RS485 of the system, and realizes the electrical isolation function of the system and an external communication object by adopting a photoelectric coupling mode. The signals are transmitted and received by adopting chips ISO1050 and ISO 3088.
The signal acquisition processing circuit adopts an amplifier chip MC33172VDR2 to amplify the analog signal input by the sensor, and adds +1.65V direct current bias voltage generated by the chip. The input analog signals include: external current voltage measurement data, direct current voltage measurement data, alternating current voltage measurement data, relay state measurement data, temperature measurement data, button state data, and the like. These signals are used for protection, measurement, control, etc. to ensure the normal operation of the device and good human-computer interaction performance.
The principle of resistance voltage division and reduction is adopted for measuring alternating current voltage and direct current voltage, the measured voltage is reduced to the maximum value and is output to a weak current signal which is in direct proportion to the input voltage, and the weak current signal is isolated by an isolation operational amplifier and then is sent to an A/D port of a DSP chip.
The output current of the Hall sensor is measured by using the Hall sensor, the Hall sensor uses +/-15 VDC as a power supply, and the rated output of the Hall sensor is 4V. The Hall sensor is connected with the signal processing board by a shielded cable. The hall sensor is processed in the same manner as other analog signals.
The current measurement of the power station checking point adopts a current transformer with the rated output of 5A, and a current signal output by the transformer is acquired by the 5A/5mA transformer and then sent to a signal acquisition board for processing.
A high-frequency switching power supply is used as an auxiliary power supply, and the auxiliary power supply is used for providing a necessary power supply for a working circuit of the equipment and maintaining the normal operation of the equipment. And high-frequency transformers are adopted to isolate different direct-current power supplies needing to be isolated. The auxiliary power supply outputs a direct current voltage which does not change along with the change of the load by adopting the principle of closed-loop negative feedback. The state of the button and the contactor is measured by connecting a normally open contact of the device by 24VDC, isolating by adopting a photoelectric coupler, sending the isolated normally open contact to a signal processing circuit, and finally sending a state signal to a DSP chip.
The human-computer interface is an interface for interaction between a human and the system, and the touch screen is used as the human-computer interface in the embodiment. Various running states and running parameters of the system can be checked through a human-computer interface; the assignment of the system operation command is also completed through the human-computer interface. The human-computer interface and the core control panel realize information interaction through an MODBUS communication protocol.
The switch control of the AC contactor adopts the level output signal of the DSP pin to be amplified and then connected with the intermediate relay, and the AC contactor is controlled through the normally open contact of the intermediate relay.
Referring to fig. 2, the dc side switching circuit is connected to the dc side external battery pack, and the ac side is connected to the grid or ac load through the breaker QF 1.
The power-on buffering time of the power-on buffering circuit design is 10s, and 2 resistors are connected with the alternating current contactor in series and are 100 omega/1 kW.
The LCL alternating current filter circuit consists of a front-stage inductor of 0.065mH, a rear-stage inductor of 0.185mH and a film capacitor of 4.7uF, the rated currents of the two-stage inductors are all 1000A, and the cut-off frequency of the whole circuit is 1 kHz.
The three-phase full-bridge inverter circuit consists of IGBT modules and auxiliary parts thereof, wherein the IGBT modules adopt half-bridge modules consisting of 2 IGBTs and anti-parallel diodes, and the three-phase full-bridge is formed by 3 half-bridge modules. The CE end of each IGBT is connected with an RC absorption circuit in parallel, and the two ends of each bridge arm are connected with a capacitor of 2uF in parallel to absorb high-frequency current. Each IGBT bridge arm of the three-phase full-bridge inversion adopts a mode that 2 1000A IGBT devices are directly connected in parallel, and the current-carrying capacity of the IGBT bridge arms is expanded.
The direct current filter circuit is formed by connecting 8 10000uF/450V electrolytic capacitors in parallel into a group and then connecting 2 groups in series.
When the storage battery pack is connected to the power grid, the charging and discharging of the storage battery pack can be preset according to the working requirements of the power station, for example, when the storage battery pack is charged and discharged, and the charging and discharging size can be preset, and the requirements of a power station system can be responded in real time according to external commands.
During grid connection, the functions of the grid-connected converter and the static reactive generator can be set at will, one of the functions can be selected, or both the functions can be selected, and the system realizes the functions of the grid-connected converter or the static reactive generator according to the set function; when the required output capacity of the system exceeds the rated capacity, the priority of any function can be set to be high when the two functions are selected, and the two functions can be distributed between the two functions according to a certain proportion, and at the moment, the two functions are realized by the system colleagues.
The selection of grid connection and off-grid and the selection of charging and discharging during grid connection can be set in advance, and the system can directly run according to the setting after starting up and can also be operated by issuing an instruction from the outside in a communication mode.
And when the grid is connected, the phase of the power grid is tracked in real time by adopting a software phase-locked loop mode. The output power grid phase is used as the reference phase controlled by the system. When the functions of the grid-connected converter are realized, one or more of the functions can be selected through factors such as the voltage of a battery pack, an upper computer, the electricity price level of the power grid at different time periods and the like, an active current instruction of the grid-connected converter is determined, and the converter realizes required active electric energy conversion. When the function of the static reactive generator is realized, the system calculates the required reactive power in real time according to the collected load current and voltage signals of the power grid, and the reactive power is sent out to meet the reactive power compensation measurement function of the power grid.
Referring to fig. 3, the integrated machine in this embodiment may be used in a 0.4kV low voltage distribution station, and when in use, the low voltage distribution station is composed of a main switch or a step-down transformer, a reactive power compensation device MFC, a protection device, a metering device, an energy storage converter, a static var generator, and the like.
The installation position of the external current transformer is a power factor check point, and the load side of the low-voltage main switch is installed in the figure 1.
Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.

Claims (10)

1. The utility model provides an energy storage converter and static var generator all-in-one which characterized in that includes: the alternating current circuit breaker, the first alternating current contactor, the LCL alternating current filter circuit, the inverter circuit, the direct current filter circuit and the direct current side switch circuit are sequentially connected in series, the two ends of the first alternating current contactor are connected with the power-on buffer circuit in parallel, and the direct current side switch circuit is connected with the storage battery pack; the AC side switch circuit is connected with a commercial power grid or a local AC load.
2. An energy storage converter and static var generator in accordance with claim 1, further comprising: the controller is connected with the signal acquisition device; the controller is also connected with the inverter circuit through the driving circuit.
3. An energy storage converter and static var generator in accordance with claim 2, further comprising: and a CAN \ RS485 communication circuit connected with the controller realizes the electrical isolation of the system and an external communication object by adopting a photoelectric coupling mode.
4. An energy storage converter and static var generator in accordance with claim 2, further comprising: and the human-computer interaction unit and the controller realize information interaction through an MODBUS communication protocol.
5. An energy storage converter and static var generator in accordance with claim 1, wherein said power-up snubber circuit comprises: the resistor R is connected in series with the second AC contactor.
6. The integrated machine of claim 1, wherein the inverter circuit is a three-phase full-bridge inverter circuit.
7. An energy storage converter and static var generator in accordance with claim 1, wherein said dc filter circuit comprises: the electrolytic capacitor comprises capacitor groups connected in series, wherein each capacitor group comprises a plurality of electrolytic capacitors connected in parallel.
8. An energy storage converter and static var generator as claimed in claim 2, wherein the level output signal of the controller pin is amplified and then connected to an intermediate relay, and the switch of the first ac contactor is controlled by the normally open contact of the intermediate relay.
9. An energy storage converter and static var generator all-in-one machine according to claim 1, wherein any one of the functions of a grid-connected converter and a static var generator can be taken as a main function, and if the surplus capacity exists after the function is completed, the other function is realized; or, only one of the two functions is implemented; different working modes can be directly switched by issuing instructions.
10. A low voltage distribution substation, comprising: an energy storage converter and static var generator all in one machine as claimed in any one of claims 1 to 9.
CN201922118371.0U 2019-11-29 2019-11-29 Energy storage converter and static var generator all-in-one, low pressure distribution station Active CN210927109U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201922118371.0U CN210927109U (en) 2019-11-29 2019-11-29 Energy storage converter and static var generator all-in-one, low pressure distribution station

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201922118371.0U CN210927109U (en) 2019-11-29 2019-11-29 Energy storage converter and static var generator all-in-one, low pressure distribution station

Publications (1)

Publication Number Publication Date
CN210927109U true CN210927109U (en) 2020-07-03

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Country Status (1)

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Effective date of registration: 20201221

Address after: Room 902, 9 / F, block B, Yinhe building, 2008 Xinluo street, hi tech Zone, Jinan City, Shandong Province

Patentee after: Shandong Luneng Software Technology Co.,Ltd. intelligent electrical branch

Address before: 250101 power intelligent robot production project 101 south of Feiyue Avenue and east of No.26 Road (in ICT Industrial Park) in Suncun District of Gaoxin, Jinan City, Shandong Province

Patentee before: National Network Intelligent Technology Co.,Ltd.

CP01 Change in the name or title of a patent holder
CP01 Change in the name or title of a patent holder

Address after: Room 902, 9 / F, block B, Yinhe building, 2008 Xinluo street, hi tech Zone, Jinan City, Shandong Province

Patentee after: Shandong luruan Digital Technology Co.,Ltd. smart energy branch

Address before: Room 902, 9 / F, block B, Yinhe building, 2008 Xinluo street, hi tech Zone, Jinan City, Shandong Province

Patentee before: Shandong Luneng Software Technology Co.,Ltd. intelligent electrical branch