CN111799835A - Control method based on parallel type energy storage converter system - Google Patents
Control method based on parallel type energy storage converter system Download PDFInfo
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- CN111799835A CN111799835A CN202010439278.4A CN202010439278A CN111799835A CN 111799835 A CN111799835 A CN 111799835A CN 202010439278 A CN202010439278 A CN 202010439278A CN 111799835 A CN111799835 A CN 111799835A
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
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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
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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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
- 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
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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
- 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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Abstract
The embodiment of the invention discloses a control method based on a parallel energy storage converter system, wherein a DC/AC bidirectional converter sends first operation information to a coordination controller through a first communication loop, and the first operation information is the operation information of the DC/AC bidirectional converter; the energy storage device sends second operation information to the coordination controller through a second communication loop, wherein the second operation information is the operation information of the energy storage device; the coordination controller receives a control instruction sent by an upper monitoring system, splits the control instruction into a plurality of sub-instructions according to the received first and second operation information, sends the plurality of sub-instructions to the corresponding DC/AC bidirectional converter through the first communication loop, and receives the corresponding control instruction sent by the coordination controller and executes the control instruction. Compared with the traditional control scheme, the scheme reduces the hardware cost and improves the response speed of the whole set of system.
Description
Technical Field
The invention relates to a control method based on a parallel type energy storage converter system.
Background
Distributed power generation has received increasing attention in recent years as an effective complement to large power grids. The micro-grid system composed of the distributed power supply, the load and the energy storage device is also widely applied to island power supply occasions similar to islands.
Due to the intermittency and randomness of the new energy, the output fluctuation of the distributed power supply is large. Due to the good power control characteristic of the energy storage system, the fluctuation of the tidal current can be well stabilized in the distributed power generation system, and the balance of supply and demand is achieved, so that the important role in the field of distributed new energy power generation is recognized in the industry.
At present, the power of a commercial energy storage converter on the market is generally not more than 500 kW. When the parallel operation of a plurality of energy storage converters is involved, a scheme generally adopted is that each DC/AC bidirectional converter is provided with 1 Power Conversion System (PCS) and 1 energy Management System (PCS) to manage the operation of the whole parallel System. The operating information of the energy storage device is typically sent to the PCS and then forwarded by the PCS to the PMS. Therefore, the energy storage converter system with the structure has high hardware cost and relatively slow response speed.
Disclosure of Invention
The invention aims to provide a control method of a parallel energy storage converter system, which can reduce the hardware cost and improve the response speed of the system compared with the traditional scheme.
In order to solve the technical problems, the invention is realized by the following technical scheme: a control method based on a parallel energy storage converter system comprises at least two energy storage unit distributed converters, a coordination controller and a grid-connected circuit breaker, wherein each energy storage unit distributed converter comprises a DC/AC bidirectional converter, an energy storage device, an AC circuit breaker and a DC circuit breaker;
all the DC/AC bidirectional converters are connected with the coordination controller to form a first communication loop, and all the energy storage devices are connected with the coordination controller to form a second communication loop;
the control method comprises the following steps:
the DC/AC bidirectional converter sends first operation information to the coordination controller through the first communication loop, wherein the first operation information is the operation information of the DC/AC bidirectional converter;
the energy storage device sends second operation information to the coordination controller through the second communication loop, wherein the second operation information is the operation information of the energy storage device;
the coordination controller receives a control instruction sent by an upper monitoring system, splits the control instruction into a plurality of sub-instructions according to the received first and second running information, sends the sub-instructions to corresponding DC/AC bidirectional converters through the first communication loop, and receives the corresponding control instruction sent by the coordination controller and executes the control instruction.
Preferably, the method further comprises: when the parallel energy storage converter system is in a shutdown state:
when the coordination controller determines that the grid-connected circuit breaker is in a closed position, according to the first operation information and the second operation information, when at least one of all the energy storage unit distributed converters has no fault and meets a grid-connected starting condition, the coordination controller starts one energy storage unit distributed converter meeting the grid-connected starting condition at intervals in sequence, and all the energy storage unit distributed converters which are started successfully operate in a constant power mode;
when the coordination controller determines that the grid-connected circuit breaker is in the position division state, when at least one of all the energy storage unit distributed converters has no fault and meets the black start condition according to the first operation information and the second operation information, the coordination controller starts one energy storage unit distributed converter meeting the black start condition first and enables the converter to work in a virtual synchronous generator VSG mode, and then starts the next energy storage unit distributed converter meeting the black start condition until all the energy storage unit distributed converters meeting the black start condition are started.
Preferably, the method further comprises:
when the parallel energy storage converter system is in an operating state, the coordination controller receives a shutdown instruction sent by the upper monitoring system and sends the shutdown instruction to the operating DC/AC bidirectional converter at intervals, and the operating DC/AC bidirectional converter turns off a PWM control signal according to the received shutdown instruction and trips an alternating current contactor and a direct current contactor inside the converter.
Preferably, the coordination controller receives a first power control instruction sent by the upper monitoring system, determines the state of charge of the energy storage device in each energy storage unit distributed converter put into operation according to first operation information and second operation information, distributes the total power contained in the first power control instruction according to the size of the state of charge of the energy storage device put into operation in proportion to obtain a second power control instruction, and sends the second power control instruction to the corresponding DC/AC bidirectional converters put into operation respectively.
Preferably, after the second power control commands are respectively sent to the corresponding DC/AC bidirectional converters in operation, when at least one of the DC/AC bidirectional converters in operation fails, the coordination controller cuts off the failed DC/AC bidirectional converter, and allocates the total power included in the first power control command according to the state of charge of the energy storage devices in the energy storage unit distributed converters in normal operation according to the state of charge of the energy storage devices in the remaining energy storage unit distributed converters in operation, so as to obtain updated second power control commands, and sends the updated second power control commands to the corresponding DC/AC bidirectional converters in operation respectively.
Compared with the prior art, the invention has the advantages that: the DC/AC bidirectional converter directly carries out information interaction with the coordination controller through the first communication loop, and information of the energy storage device is directly sent to the coordination controller through the second communication loop, so that transfer of a PCS (personal communications System) is not needed, hardware cost is reduced, and response speed of the whole system is improved. With the improvement of the response speed of the system, the DC/AC bidirectional converter can be developed to high frequency and miniaturization.
Drawings
FIG. 1 is a schematic diagram of a parallel energy storage converter system;
fig. 2 is a schematic flow chart of the method for starting the complete energy storage converter system according to an embodiment of the present invention after receiving an instruction from the upper monitoring system;
fig. 3 is a schematic flow chart of an embodiment of the present invention for receiving an instruction from an upper monitoring system to stop the entire packaged energy storage converter system;
fig. 4 is a schematic diagram of the parallel energy storage converter system operating in the constant power mode according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1, the parallel energy storage converter system according to the embodiment of the present invention includes N (N ≧ 2) energy storage unit distributed converters, a coordination controller 002, and a grid-connected circuit breaker MCCB. Each energy storage unit distributed converter comprises a DC/AC bidirectional converter, an energy storage device, an alternating current breaker and a direct current breaker. For convenience of description, the energy storage device in the energy storage unit distributed converter is labeled as 11i, the direct current breaker is labeled as DCKi, the DC/AC bidirectional converter is labeled as 12i, the alternating current breaker is labeled as ACKi, and i is greater than or equal to 1 and less than or equal to N. The energy storage device, the direct current breaker, the DC/AC bidirectional converter and the alternating current breaker in the first energy storage unit distributed converter are respectively marked with numbers 111, DCK1, 121 and ACK1, the energy storage device, the direct current breaker, the DC/AC bidirectional converter and the alternating current breaker in the second energy storage unit distributed converter are respectively marked with numbers 112, DCK2, 122 and ACK2, and so on, and the energy storage device, the direct current breaker, the DC/AC bidirectional converter and the alternating current breaker in the Nth energy storage unit distributed converter are respectively marked with numbers 11N, DCKN and 12N, ACKN.
The N energy storage unit distributed converters are connected in parallel, the direct current breaker DCKi is connected in series between the energy storage device 11i and the direct current side of the DC/AC bidirectional converter 12i, the alternating current breaker ACKi is connected in series between the alternating current side of the DC/AC bidirectional converter 12i and the alternating current bus 101, and the grid-connected breaker MCCB is connected in series between the alternating current bus 101 and the power grid.
The system also comprises a first communication loop formed by connecting the DC/AC bidirectional converter 12i with the coordination controller 002 through a CAN bus, and a second communication loop formed by connecting the energy storage device 11i with the coordination controller 002 through another CAN bus.
Through the first communication loop, the real-time data interaction of the operation information and the control instruction can be performed between the DC/AC bidirectional converter 12i and the coordination controller 002, including: the coordination controller 002 receives operation information of the DC/AC bidirectional converter 12i, which is referred to herein as first operation information; the coordination controller 002 performs independent start-stop control and operation mode control on the DC/AC bidirectional converter 12 i; the coordination controller 002 performs independent power control on the DC/AC bidirectional converter 12i, so that the DC/AC bidirectional converter 12i can operate in any of charging, discharging or static states.
Through the second communication circuit, the energy storage device 11i can send its own operation information to the coordination controller 002 in real time, including: the voltage, SOC, charge/discharge power, and the like of the energy storage device 11i are referred to herein as second operation information. The coordination controller 002 adjusts the control command issued to the DC/AC bidirectional converter 12i connected to the energy storage device 11i in real time according to the information.
The embodiment of the invention also provides a control method based on the parallel energy storage converter system, which comprises the following steps: start-stop control and power control.
As shown in fig. 2, when the parallel energy storage converter system is in a shutdown state, the start control method includes the following steps:
step 201: the coordination controller 002 receives a start instruction sent by the upper monitoring system 001. The upper monitoring system 001 can judge whether the system is in a shutdown state or not according to the operation information of the system energy storage converter system acquired by the coordination controller 002 and the management personnel according to the operation information. When the manager considers that the energy storage converter system needs to be started, the remote control starting operation can be carried out through the upper monitoring system 001.
Step 202: and judging whether the grid-connected circuit breaker MCCB is in a closed position or not. If yes, go to step 203; if not, step 205 is performed. Here, it is necessary to determine the starting method of the DC/AC bidirectional converter 12i based on the position information of the MCCB. When the MCCB is in the on position, the DC/AC bidirectional converter 12i adopts a grid-connected starting mode and works in a constant power mode after being started; when the MCCB is in the tap position, the DC/AC bidirectional converter 12i adopts a black start mode, and operates in the VSG mode after start.
Step 203: and judging whether at least one DC/AC bidirectional converter 12i meets grid-connected starting conditions. If yes, go to step 204; if not, returning to the system shutdown state. The grid-connected starting conditions comprise: the DC/AC bidirectional converter 12i and the energy storage device 11i have no faults, and the first communication loop and the second communication loop are normal.
Step 205: it is judged whether at least one of the DC/AC bidirectional converters 12i satisfies the black start condition. If so, go to step 206; if not, returning to the system shutdown state. The black start condition includes: the DC/AC bidirectional converter 12i and the energy storage device 11i have no faults, and the first communication loop and the second communication loop are normal.
Step 204: and sequentially starting 1 DC/AC bidirectional converter 12i meeting grid-connected starting conditions at intervals, and enabling all the successfully started DC/AC bidirectional converters 12i to operate in a constant power mode. Judging whether at least 1 DC/AC bidirectional converter 12i is started successfully or not, if so, the grid-connected starting is successful; if not, returning to the system shutdown state.
Step 206: starting 1 DC/AC bidirectional converter 12i meeting the black start condition, enabling the DC/AC bidirectional converter to work in a VSG mode, and then starting the next DC/AC bidirectional converter 12i meeting the black start condition for one time. Judging whether at least 1 DC/AC bidirectional converter 12i is started successfully or not, if so, the black start is successful; if not, returning to the system shutdown state.
As shown in fig. 3, when the parallel energy storage converter system is in an operating state, the shutdown control method includes the following steps:
step 301: the coordination controller 002 receives the shutdown command from the upper monitoring system 001. The upper monitoring system 001 can judge whether the system is in an operating state according to the operating information of the system energy storage converter system acquired by the coordination controller 002 and the manager. When the manager considers that the energy storage converter system needs to be stopped, the remote control shutdown operation can be carried out through the upper monitoring system 001.
Step 302: the PWM control signal of the operating DC/AC bidirectional converter 12i is in turn blocked. Here, the shutdown signal is sequentially issued to the operating DC/AC bidirectional converter 12i at intervals, and the DC/AC bidirectional converter 12i turns off its own PWM signal after receiving the shutdown signal.
Step 303: the DC/AC bidirectional converter 12i trips the DC-side contactor and the AC-side contactor. After shutdown, the DC/AC bidirectional converter 12i trips its AC/DC contactor to disconnect the power loop for safety.
As shown in fig. 4, when the parallel energy storage converter system operates in the constant power mode, the power control method includes the following steps:
step 401: the coordinating controller 002 receives the power command. The power instruction is calculated by the energy storage system according to the state of the power grid, and can also be generated by remote regulation operation of a manager through the upper monitoring system 001.
Step 402: the power command, referred to herein as the second power command, assigned to each operating DC/AC bidirectional converter 12i is calculated. The coordination controller 002 distributes the received power commands in proportion according to the SOC of the energy storage device 11i connected with the running DC/AC bidirectional converter 12i to obtain a plurality of second power commands.
Step 403: the coordinating controller 002 distributes the second power command to the corresponding DC/AC bidirectional converter 12 i. The coordination controller 002 sends the second power command to the corresponding DC/AC bidirectional converter 12i through the first communication circuit.
Step 404: the DC/AC bidirectional converter 12i executes the received second power command. The DC/AC bidirectional converter 12i changes the PWM signal according to the received second power command, and outputs the same power as the second power command.
Step 405: and judging whether the running DC/AC bidirectional converter 12i has a fault or not. And if so, rejecting the DC/AC bidirectional converter with the fault, and returning to recalculate the second power instruction.
According to the control method of the parallel energy storage converter system, the PMS CAN be directly communicated with the DC/AC bidirectional converter and the energy storage device through the CAN protocol, the DC/AC bidirectional converter directly carries out information interaction with the coordination controller through the first communication loop, the information of the energy storage device is directly sent to the coordination controller through the second communication loop, transfer of the PCS is not needed, hardware cost is reduced, and response speed of the whole system is improved. With the improvement of the response speed of the system, the DC/AC bidirectional converter can be developed to high frequency and miniaturization.
The above description is only an embodiment of the present invention, but the technical features of the present invention are not limited thereto, and any changes or modifications within the technical field of the present invention by those skilled in the art are covered by the claims of the present invention.
Claims (5)
1. A control method based on a parallel energy storage converter system is characterized in that: the parallel energy storage converter system comprises at least two energy storage unit distributed converters, a coordination controller and a grid-connected circuit breaker, wherein each energy storage unit distributed converter comprises a DC/AC bidirectional converter, an energy storage device, an AC circuit breaker and a DC circuit breaker;
all the DC/AC bidirectional converters are connected with the coordination controller to form a first communication loop, and all the energy storage devices are connected with the coordination controller to form a second communication loop;
the control method comprises the following steps:
the DC/AC bidirectional converter sends first operation information to the coordination controller through the first communication loop, wherein the first operation information is the operation information of the DC/AC bidirectional converter;
the energy storage device sends second operation information to the coordination controller through the second communication loop, wherein the second operation information is the operation information of the energy storage device;
the coordination controller receives a control instruction sent by an upper monitoring system, splits the control instruction into a plurality of sub-instructions according to the received first and second running information, sends the sub-instructions to corresponding DC/AC bidirectional converters through the first communication loop, and receives the corresponding control instruction sent by the coordination controller and executes the control instruction.
2. A control method based on a parallel energy storage converter system according to claim 1, characterized in that: the method further comprises the following steps: when the parallel energy storage converter system is in a shutdown state:
when the coordination controller determines that the grid-connected circuit breaker is in a closed position, according to the first operation information and the second operation information, when at least one of all the energy storage unit distributed converters has no fault and meets a grid-connected starting condition, the coordination controller starts one energy storage unit distributed converter meeting the grid-connected starting condition at intervals in sequence, and all the energy storage unit distributed converters which are started successfully operate in a constant power mode;
when the coordination controller determines that the grid-connected circuit breaker is in the position division state, when at least one of all the energy storage unit distributed converters has no fault and meets the black start condition according to the first operation information and the second operation information, the coordination controller starts one energy storage unit distributed converter meeting the black start condition first and enables the converter to work in a virtual synchronous generator VSG mode, and then starts the next energy storage unit distributed converter meeting the black start condition until all the energy storage unit distributed converters meeting the black start condition are started.
3. A control method based on a parallel energy storage converter system according to claim 1, characterized in that: the method further comprises the following steps:
when the parallel energy storage converter system is in an operating state, the coordination controller receives a shutdown instruction sent by the upper monitoring system and sends the shutdown instruction to the operating DC/AC bidirectional converter at intervals, and the operating DC/AC bidirectional converter turns off a PWM control signal according to the received shutdown instruction and trips an alternating current contactor and a direct current contactor inside the converter.
4. A control method based on a parallel energy storage converter system according to claim 1, characterized in that: the coordination controller receives a first power control instruction sent by the upper monitoring system, confirms the charge state of an energy storage device in each energy storage unit distributed converter which is put into operation according to first operation information and second operation information, distributes the total power contained in the first power control instruction according to the charge state of the energy storage device which is put into operation in proportion to obtain a second power control instruction, and sends the second power control instruction to the corresponding DC/AC bidirectional converters which are put into operation respectively.
5. A control method based on a parallel energy storage converter system according to claim 4, characterized in that: after the second power control commands are respectively sent to the corresponding DC/AC bidirectional converters which are put into operation, when at least one of the DC/AC bidirectional converters which are put into operation fails, the coordination controller cuts off the failed DC/AC bidirectional converter, distributes the total power contained in the first power control command according to the charge state of the energy storage devices in the energy storage unit distributed converters which are left to be normally put into operation in proportion to obtain updated second power control commands, and respectively sends the updated second power control commands to the corresponding DC/AC bidirectional converters which are put into operation.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112436532A (en) * | 2020-11-11 | 2021-03-02 | 许继集团有限公司 | Modular converter control method and device |
| CN112865154A (en) * | 2021-03-08 | 2021-05-28 | 阳光电源股份有限公司 | Energy storage system and battery cluster balance control method thereof |
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| CN112865154A (en) * | 2021-03-08 | 2021-05-28 | 阳光电源股份有限公司 | Energy storage system and battery cluster balance control method thereof |
| CN112865154B (en) * | 2021-03-08 | 2024-04-12 | 阳光电源股份有限公司 | Energy storage system and battery cluster balance control method thereof |
| WO2024077697A1 (en) * | 2022-10-14 | 2024-04-18 | 深圳市倍思科技有限公司 | Energy storage device, control device, and paralleling system |
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