Efficiency improvement control method and system of double-branch energy storage converter and medium

Abstract

The invention discloses an efficiency improvement control method for a double-branch energy storage converter, and the method comprises the steps: receiving a power scheduling instruction value, the power instruction value of a branch controller being half of the power scheduling instruction value; comparing the power scheduling instruction value with single branch rated power, and updating the first branch power instruction value and the second branch power instruction value according to a comparison result; judging whether the first branch power instruction value or the second branch power instruction value exceeds amplitude limiting or not; if not, analyzing the whole machine conversion power loss, and judging whether the power loss is reduced or not; if so, updating the power instruction values of the two branches; if the amplitude is not reduced or exceeds the limiting amplitude, respectively recovering to the corresponding power instruction value of the previous moment; calculating a difference value between the total charge and discharge quantities of the current first power branch and the second power branch, and judging whether the difference value exceeds a set difference value threshold value or not; when exceeded, the first power branch and the second power branch are switched. The method improves the efficiency of the whole machine, and achieves the purposes of consumption reduction and energy conservation.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to an efficiency improvement control method, system and medium for a dual-branch energy storage converter. Background Art

[0002] With the continuous development of renewable energy generation technologies, represented by photovoltaic and wind power, my country's power system is experiencing a new "double high" trend: high penetration of new energy and a high proportion of power electronic converters. To adapt to the randomness, intermittency, and volatility of renewable energy, energy storage converters are widely used on both the grid and load sides.

[0003] The main function of the energy storage inverter is to realize energy exchange between the energy storage battery and the power grid and load side. It has certain energy loss itself. As the whole society pays attention to the trend of energy conservation and environmental protection, it is crucial to optimize the operating characteristics of the energy storage inverter and improve the conversion efficiency of the converter to achieve high energy efficiency of electronic equipment.

[0004] High-power energy storage converters typically employ a multi-branch parallel topology to enable rapid development and iteration of converters tailored to varying capacity requirements. For dual-branch energy storage converters, which employ a direct parallel topology with two power branches on the AC side, a power command equalization control strategy is employed throughout the entire power range. This means that each power branch receives half the dispatched power command. This means that the converter does not necessarily operate at optimal overall efficiency, and in particular, the overall efficiency of the converter can be extremely low under low-power operating conditions. Summary of the Invention

[0005] The purpose of the embodiments of the present invention is to provide a method, system and medium for improving the efficiency of a dual-branch energy storage converter, thereby solving the problem of low overall efficiency of the energy storage converter.

[0006] The present invention is achieved through the following technical solutions: In a first aspect, a first embodiment of the present invention provides an efficiency improvement control method for a dual-branch energy storage converter, applicable to a local coordination controller, comprising: Initializing and setting a first power branch and a second power branch, wherein the power of the first power branch is greater than the power of the second power branch; Receive the power dispatch instruction value, and set the power instruction value sent to the branch controller to be half of the power dispatch instruction value; Compare the power dispatch instruction value with the rated power of a single branch, and update the first branch power instruction value and the second branch power instruction value respectively according to the comparison result; Determining whether the first branch power command value or the second branch power command value exceeds the limit; If it does not exceed the limit, analyze the conversion power loss of the whole machine to determine whether the power loss has been reduced; If it decreases, the first branch power instruction value and the second branch power instruction value are updated respectively; If the power command value of the first branch and the power command value of the second branch are not reduced or exceeded, the power command value of the first branch and the power command value of the second branch are respectively restored to the power command value of the corresponding previous moment; Calculating the difference between the total charge and discharge amounts of the first power branch and the second power branch, and determining whether the difference exceeds a set difference threshold; When the voltage exceeds the limit, the first power branch and the second power branch are controlled to switch.

[0007] Furthermore, the specific method of updating the first branch power instruction value and the second branch power instruction value respectively according to the comparison result includes: When the comparison result is greater than, the first branch power instruction value and the second branch power instruction value are maintained at half of the power scheduling instruction value; When the comparison result is less than or equal to, the local coordination controller sets the first branch power instruction value to the first value obtained by the sum of the first branch power instruction value and the power adjustment step at the previous moment, and the local coordination controller sets the second branch power instruction value to the second value obtained by the difference between the second branch power instruction value and the power adjustment step at the previous moment.

[0008] Furthermore, the specific method for determining whether the first branch power command value or the second branch power command value exceeds the limit includes: Determine whether the first branch power command value is greater than the single branch rated power or the second branch power command value is less than 0.

[0009] Furthermore, the specific method for analyzing the conversion power loss of the whole machine includes: Calculating the difference between the whole machine power loss under the power command value at the previous moment and the whole machine power loss under the current power command value to obtain a third value; The third value is compared with a set power loss threshold.

[0010] Furthermore, the method for calculating the power loss of the entire machine includes: In charging mode, the power loss of the whole machine is equal to the sum of the effective values of the AC side power of the two branches minus the sum of the effective values of the DC side power of the two branches; In the discharge mode, the power loss of the whole machine is equal to the sum of the effective values of the DC side power of the two branches minus the sum of the effective values of the AC side power of the two branches.

[0011] In a second aspect, another embodiment of the present invention provides an efficiency improvement control system for a dual-branch energy storage converter, including a local coordination controller, wherein the local coordination controller includes an initialization module, a receiving module, and an analysis and control module. The initialization module is configured to initialize and set a first power branch and a second power branch, wherein the power of the first power branch is greater than the power of the second power branch; The receiving module is configured to receive a power scheduling instruction value and set the power instruction value issued to the branch controller to be half of the power scheduling instruction value; The analysis and control module is configured to compare the power dispatch instruction value with the rated power of a single branch, and update the first branch power instruction value and the second branch power instruction value respectively according to the comparison result; Determining whether the first branch power command value or the second branch power command value exceeds the limit; If it does not exceed the limit, analyze the conversion power loss of the whole machine to determine whether the power loss has been reduced; If it decreases, the first branch power instruction value and the second branch power instruction value are updated respectively; If the power command value of the first branch and the power command value of the second branch are not reduced or exceeded, the power command value of the first branch and the power command value of the second branch are respectively restored to the power command value of the corresponding previous moment; Calculating the difference between the total charge and discharge amounts of the first power branch and the second power branch, and determining whether the difference exceeds a set difference threshold; When the voltage exceeds the limit, the first power branch and the second power branch are controlled to switch.

[0012] Furthermore, the analysis and control module includes a first comparison unit, which is used to compare the power scheduling instruction value with the rated power of a single branch, and update the first branch power instruction value and the second branch power instruction value respectively according to the comparison result. When the comparison result is greater than, the first branch power instruction value and the second branch power instruction value are maintained as half of the power scheduling instruction value; when the comparison result is less than or equal to, the local coordination controller sets the first branch power instruction value to the first value obtained by the sum of the first branch power instruction value and the power adjustment step at the previous moment, and the local coordination controller sets the second branch power instruction value to the second value obtained by the difference between the second branch power instruction value and the power adjustment step at the previous moment.

[0013] Furthermore, the analysis and control module includes a power loss analysis unit and a power loss calculation unit, wherein the power loss analysis unit is configured to calculate the difference between the power loss of the entire machine under the power command value at a previous moment and the power loss value of the entire machine under the current power command value to obtain a third value, and compare the third value with a set power loss threshold; The power loss calculation unit is configured to calculate, in the charging mode, a total power loss value of the whole machine equal to the sum of the effective values of the AC side powers of the two branches minus the sum of the effective values of the DC side powers of the two branches; In the discharge mode, the power loss of the whole machine is equal to the sum of the effective values of the DC side power of the two branches minus the sum of the effective values of the AC side power of the two branches.

[0014] In a third aspect, another embodiment of the present invention provides a local coordination controller, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method described in the first embodiment when executing the program.

[0015] In a fourth aspect, another embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method described in the first embodiment is implemented.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects: The present invention provides an efficiency improvement control method, system, and medium for a dual-branch energy storage converter. By receiving power scheduling instructions and calculating the overall power loss, the system analyzes the overall power loss under different power instructions, rationally allocates power instruction values for each power branch, and obtains a branch power instruction value combination with the lowest overall loss. This allows the energy storage converter to operate at the optimal efficiency possible, improves overall efficiency, and achieves energy conservation and consumption reduction. By calculating the difference between the total charge and discharge amounts of the current high-power branch and the low-power branch, switching between the high-power branch and the low-power branch occurs when the difference exceeds a set difference threshold, preventing a branch from operating in a high-power or low-power state for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the examples. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can also derive other relevant drawings based on these drawings without inventive effort. In the drawings: Figure 1 A flow chart of a method for improving the efficiency of a dual-branch energy storage converter provided by the first embodiment of the present invention; Figure 2 is a flowchart of a specific example of the first embodiment of the present invention; Figure 3 A structural block diagram of an efficiency improvement control system for a dual-branch energy storage converter provided by another embodiment of the present invention; Figure 4Schematic diagram of a dual-branch energy storage converter system in another embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0019] like Figure 1 As shown, a first embodiment of the present invention provides an efficiency improvement control method for a dual-branch energy storage converter, comprising the following steps: Initializing and setting a first power branch and a second power branch, wherein the power of the first power branch is greater than the power of the second power branch; Receive the power dispatch instruction value, and set the power instruction value sent to the branch controller to be half of the power dispatch instruction value; Compare the power dispatch instruction value with the rated power of a single branch, and update the first branch power instruction value and the second branch power instruction value respectively according to the comparison result; Determining whether the first branch power command value or the second branch power command value exceeds the limit; If it does not exceed the limit, analyze the conversion power loss of the whole machine to determine whether the power loss has been reduced; If it decreases, the first branch power instruction value and the second branch power instruction value are updated respectively; If the power command value of the first branch and the power command value of the second branch are not reduced or exceeded, the power command value of the first branch and the power command value of the second branch are respectively restored to the power command value of the corresponding previous moment; Calculating the difference between the total charge and discharge amounts of the first power branch and the second power branch, and determining whether the difference exceeds a set difference threshold; When the voltage exceeds the limit, the first power branch and the second power branch are controlled to switch.

[0020] Specifically, if Figure 2 As shown, an efficiency improvement control method for a dual-branch energy storage converter provided by an embodiment of the present invention includes: S1: The local coordination controller initializes and sets branch 1 as the high-power branch and branch 2 as the low-power branch. The threshold of the difference between the total charge and discharge amount of the high-power branch and the low-power branch is ;Power adjustment step ;Power loss threshold .

[0021] S2: The local coordination controller receives the power scheduling instruction value , then the power instruction sent to the branch controller is ,in, is the power command value of the high power branch, is the power command value of the low power branch.

[0022] S3: Compare the power dispatch command value with the rated power of a single branch. If , then the power instructions of the two branches are kept as , no branch power command adjustment is performed, where, is the rated power of the whole machine, is the rated power of a single branch; if , the local coordination controller adjusts the power command value of the high power branch to , the power command value of the low power branch is ,in, is the high power branch power command value at the previous moment, is the low power branch power command value at the previous moment.

[0023] S4: Determine whether the branch power command value exceeds the limit. Specifically: if the high-power branch power command is greater than the rated power of a single branch or the low-power branch power command value is less than 0, it means that the limit is exceeded, then the high-power branch power command value is restored to , restore the low power branch power command value to , go to step S6.

[0024] S5: If the limit is not exceeded, the whole machine conversion power loss analysis is performed to determine whether the power loss is reduced. Specifically: calculate the whole machine power loss under the power command value at the previous moment The power loss of the whole machine under the current power command value The difference is compared with the preset power loss threshold. , then the current high power branch power command value is restored to the high power branch power command value at the previous moment , restore the current low power branch power command value to the low power branch power command value of the previous moment , go to step S6; if , repeat steps S3 to S5. Among them, the power loss of the whole machine The local coordination controller collects the effective value of the DC side power of the two branches and And AC side power effective value and The power loss calculation formula of the whole machine in charging mode is: , The calculation formula for the power loss of the whole machine in discharge mode is: .

[0025] The local coordination controller uses steps S1-S5 to analyze the power loss of the entire machine using the power adjustment step, power loss threshold parameters, received power scheduling instruction value and the power loss of the entire machine, reasonably allocates the power instruction value of each branch, and improves the efficiency of the entire machine of the converter, especially the efficiency of the entire machine under low power.

[0026] S6: The local coordination controller calculates the difference between the total charge and discharge amount of the current high power branch and the low power branch , if the difference Exceeds the set difference threshold , the high power branch and the low power branch are controlled to switch.

[0027] The local coordination controller compares the calculated difference between the total charge and discharge amounts of the current high-power branch and the low-power branch with the set difference threshold through step S6, and switches the high-power branch and the low-power branch when the difference exceeds the difference threshold to avoid a branch running in a high-power or low-power state for a long time.

[0028] An embodiment of the present invention provides an efficiency improvement control method for a dual-branch energy storage converter. By receiving power scheduling instructions and calculating the overall power loss, the overall power loss of the converter is analyzed under different power instructions. The power instruction values of each power branch are reasonably allocated to obtain the branch power instruction value combination with the lowest overall loss. This method enables the energy storage converter to operate at the optimal efficiency as much as possible, improves overall efficiency, and achieves the purpose of reducing consumption and energy. By calculating the difference between the total charge and discharge amount of the current high-power branch and the low-power branch, when the difference exceeds a set difference threshold, the high-power branch and the low-power branch are switched to prevent a branch from operating in a high-power or low-power state for a long time.

[0029] like Figure 3As shown, another embodiment of the present invention provides an efficiency improvement control system for a dual-branch energy storage converter, including a local coordination controller, the local coordination controller including an initialization module, a receiving module and an analysis control module, wherein the initialization module is configured to initialize the setting of a first power branch and a second power branch, the power of the first power branch is greater than the power of the second power branch; the receiving module is configured to receive a power scheduling instruction value, and set the power instruction value issued to the branch controller to half of the power scheduling instruction value; the analysis control module is configured to compare the power scheduling instruction value with the rated power of a single branch, and respectively adjust the power instruction value of the first branch according to the comparison result. and update the power instruction value of the second branch; determine whether the power instruction value of the first branch or the power instruction value of the second branch exceeds the limit; if it does not exceed the limit, analyze the conversion power loss of the entire machine to determine whether the power loss is reduced; if it is reduced, update the power instruction value of the first branch and the power instruction value of the second branch respectively; if it does not decrease or exceeds the limit, restore the power instruction value of the first branch and the power instruction value of the second branch to the power instruction value of the corresponding previous moment respectively; calculate the difference between the total charge and discharge amount of the current first power branch and the second power branch, and determine whether the difference exceeds the set difference threshold; when it exceeds, control the first power branch and the second power branch to switch.

[0030] The analysis and control module includes a first comparison unit, which is used to compare the power scheduling instruction value with the rated power of a single branch, and update the first branch power instruction value and the second branch power instruction value respectively according to the comparison result. When the comparison result is greater than, the first branch power instruction value and the second branch power instruction value are maintained as half of the power scheduling instruction value; when the comparison result is less than or equal to, the local coordination controller sets the first branch power instruction value to a first value obtained by the sum of the first branch power instruction value and the power adjustment step at the previous moment, and the local coordination controller sets the second branch power instruction value to a second value obtained by the difference between the second branch power instruction value and the power adjustment step at the previous moment.

[0031] The analysis and control module includes a power loss analysis unit and a power loss calculation unit. The power loss analysis unit is configured to calculate the difference between the power loss of the entire machine under the power command value at a previous moment and the power loss value of the entire machine under the current power command value to obtain a third value, and compare the third value with a set power loss threshold; The power loss calculation unit is configured to calculate, in the charging mode, a total power loss value of the whole machine equal to the sum of the effective values of the AC side powers of the two branches minus the sum of the effective values of the DC side powers of the two branches; In the discharge mode, the power loss of the whole machine is equal to the sum of the effective values of the DC side power of the two branches minus the sum of the effective values of the AC side power of the two branches.

[0032] An embodiment of the present invention provides an efficiency improvement system for a dual-branch energy storage converter. A local coordination controller receives power scheduling instructions and calculates the overall power loss. It analyzes the overall power loss under different power instructions, rationally allocates power instruction values for each power branch, and obtains a branch power instruction value combination with the lowest overall loss. This allows the energy storage converter to operate at optimal efficiency, improves overall efficiency, and achieves energy conservation. By calculating the difference between the total charge and discharge amounts of the current high-power branch and the low-power branch, switching between the high-power branch and the low-power branch occurs when the difference exceeds a set difference threshold, preventing a branch from operating in a high-power or low-power state for an extended period of time.

[0033] like Figure 4 As shown, another embodiment of the present invention provides a dual-branch energy storage converter system, comprising: a dual-branch energy storage converter, a branch controller, and a local coordination controller. This embodiment of the present invention provides a local coordination controller, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the efficiency improvement control method for the dual-branch energy storage converter described in the first embodiment.

[0034] The present invention also describes a computer-readable medium having a computer program stored thereon. The computer program is executed by a processor to implement the efficiency improvement control method of a dual-branch energy storage converter as described in the first embodiment.

[0035] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0036] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0037] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0038] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 The steps for the function specified in one or more boxes.

[0039] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for improving the efficiency of a dual-branch energy storage converter, characterized in that: For local coordination controllers, including: Initializing and setting a first power branch and a second power branch, wherein the power of the first power branch is greater than the power of the second power branch; Receive the power dispatch instruction value, and set the power instruction value sent to the branch controller to be half of the power dispatch instruction value; Compare the power dispatch instruction value with the rated power of a single branch, and update the first branch power instruction value and the second branch power instruction value respectively according to the comparison result; Determining whether the first branch power command value or the second branch power command value exceeds the limit; If it does not exceed the limit, analyze the conversion power loss of the whole machine to determine whether the power loss has been reduced; If it decreases, the first branch power instruction value and the second branch power instruction value are updated respectively; If the power command value of the first branch and the power command value of the second branch are not reduced or exceeded, the power command value of the first branch and the power command value of the second branch are respectively restored to the power command value of the corresponding previous moment; Calculating the difference between the total charge and discharge amounts of the first power branch and the second power branch, and determining whether the difference exceeds a set difference threshold; When the voltage exceeds the limit, the first power branch and the second power branch are controlled to switch.

2. The efficiency improvement control method of a dual-branch energy storage converter according to claim 1, characterized in that: The specific method of updating the first branch power instruction value and the second branch power instruction value respectively according to the comparison result includes: When the comparison result is greater than, the first branch power instruction value and the second branch power instruction value are maintained at half of the power scheduling instruction value; When the comparison result is less than or equal to, the local coordination controller sets the first branch power instruction value to the first value obtained by the sum of the first branch power instruction value and the power adjustment step at the previous moment, and the local coordination controller sets the second branch power instruction value to the second value obtained by the difference between the second branch power instruction value and the power adjustment step at the previous moment.

3. The efficiency improvement control method of the dual-branch energy storage converter according to claim 2 is characterized in that: The specific method for determining whether the first branch power instruction value or the second branch power instruction value exceeds the limit includes: Determine whether the first branch power command value is greater than the single branch rated power or the second branch power command value is less than 0.

4. The efficiency improvement control method of the dual-branch energy storage converter according to claim 2 or 3, characterized in that: The specific method for analyzing the conversion power loss of the whole machine includes: Calculating the difference between the whole machine power loss under the power command value at the previous moment and the whole machine power loss under the current power command value to obtain a third value; The third value is compared with a set power loss threshold.

5. The efficiency improvement control method of a dual-branch energy storage converter according to claim 4, characterized in that: The method for calculating the power loss of the entire machine includes: In charging mode, the power loss of the whole machine is equal to the sum of the effective values of the AC side power of the two branches minus the sum of the effective values of the DC side power of the two branches; In the discharge mode, the power loss of the whole machine is equal to the sum of the effective values of the DC side power of the two branches minus the sum of the effective values of the AC side power of the two branches.

6. An efficiency improvement control system for a dual-branch energy storage converter, characterized in that: It includes a local coordination controller, which includes an initialization module, a receiving module and an analysis and control module. The initialization module is configured to initialize and set a first power branch and a second power branch, wherein the power of the first power branch is greater than the power of the second power branch; The receiving module is configured to receive a power scheduling instruction value and set the power instruction value issued to the branch controller to be half of the power scheduling instruction value; The analysis and control module is configured to compare the power dispatch instruction value with the rated power of a single branch, and update the first branch power instruction value and the second branch power instruction value respectively according to the comparison result; Determining whether the first branch power command value or the second branch power command value exceeds the limit; If it does not exceed the limit, analyze the conversion power loss of the whole machine to determine whether the power loss has been reduced; If it decreases, the first branch power instruction value and the second branch power instruction value are updated respectively; If the power command value of the first branch and the power command value of the second branch are not reduced or exceeded, the power command value of the first branch and the power command value of the second branch are respectively restored to the power command value of the corresponding previous moment; Calculating the difference between the total charge and discharge amounts of the first power branch and the second power branch, and determining whether the difference exceeds a set difference threshold; When the voltage exceeds the limit, the first power branch and the second power branch are controlled to switch.

7. The efficiency improvement control system of the dual-branch energy storage converter according to claim 6, characterized in that: The analysis and control module includes a first comparison unit, which is used to compare the power scheduling instruction value with the rated power of a single branch, and update the first branch power instruction value and the second branch power instruction value respectively according to the comparison result. When the comparison result is greater than, the first branch power instruction value and the second branch power instruction value are maintained as half of the power scheduling instruction value; when the comparison result is less than or equal to, the local coordination controller sets the first branch power instruction value to a first value obtained by the sum of the first branch power instruction value and the power adjustment step at the previous moment, and the local coordination controller sets the second branch power instruction value to a second value obtained by the difference between the second branch power instruction value and the power adjustment step at the previous moment.

8. The efficiency improvement control system of the dual-branch energy storage converter according to claim 7, characterized in that: The analysis and control module includes a power loss analysis unit and a power loss calculation unit, wherein the power loss analysis unit is configured to calculate the difference between the power loss of the entire machine under the power command value at the previous moment and the power loss value of the entire machine under the current power command value to obtain a third value, and compare the third value with a set power loss threshold; The power loss calculation unit is configured to calculate, in the charging mode, a total power loss value of the whole machine equal to the sum of the effective values of the AC side powers of the two branches minus the sum of the effective values of the DC side powers of the two branches; In the discharge mode, the power loss of the whole machine is equal to the sum of the effective values of the DC side power of the two branches minus the sum of the effective values of the AC side power of the two branches.

9. A local coordination controller comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the method according to any one of claims 1 to 5 is implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.

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