Microgrid system, control method, converter and equipment

Abstract

The embodiment of the invention provides a micro-grid system, a control method, a converter and equipment. The micro-grid system includes: a bus; the plurality of energy storage converters are connected with the bus; wherein at least a part of the energy storage converters in the plurality of energy storage converters are target energy storage converters, and the target energy storage converters can obtain operation state information of the at least a part of the energy storage converters in the plurality of energy storage converters and electrical parameters of the bus; wherein under the condition that the electrical parameters of the bus indicate that the micro-grid system is in an abnormal working state, each target energy storage converter can generate a corresponding adjustment factor according to the own operation state information and the acquired operation state information; and each target energy storage converter adjusts the output power based on the corresponding adjustment factor, so that the micro-grid system is adjusted to a normal operation state. According to the invention, the operation stability of the micro-grid system can be improved to a certain extent.

Description

Technical Field

[0001] The embodiments in this application relate to the field of power system technology, specifically to a microgrid system, control method, converter, and equipment. Background Technology

[0002] In microgrid systems, power conversion systems (PCS), as an important component of grid-connected energy storage devices, are typically used to provide stable voltage, current, and frequency support, enabling islanded or seamless grid-connected operation of the microgrid. When abnormal operating conditions such as faults or disturbances occur in the microgrid system, the central controller of the microgrid system will issue unified adjustment commands to maintain the transient stability of the system.

[0003] However, in related technologies, due to the large number of energy storage converters in microgrid systems, centralized control suffers from significant response delays caused by lengthy communication links. Especially when the operating state of the microgrid system changes drastically, centralized control struggles to accurately and promptly regulate power, easily leading to imbalances in the operating states of the various energy storage converters. Summary of the Invention

[0004] This application provides a microgrid system, control method, converter, and equipment, which can improve the operational stability of the microgrid system to a certain extent.

[0005] In a first aspect, embodiments of this application provide a microgrid system, comprising: a bus; and a plurality of energy storage converters connected to the bus; wherein at least some of the plurality of energy storage converters are target energy storage converters, and at least some of the plurality of energy storage converters are configured to have a communication connection with the target energy storage converters; the target energy storage converters can acquire electrical parameters of the bus and acquire operating status information of their respective energy storage converters through the communication connection; wherein, when the electrical parameters of the bus indicate that the microgrid system is in an abnormal operating state, each target energy storage converter can generate a corresponding adjustment factor based on its own operating status information and the acquired operating status information, and each target energy storage converter can adjust its active power based on the corresponding adjustment factor, so that the microgrid system is adjusted to a normal operating state; wherein, the adjustment factor is an adjustment coefficient for active power compensation.

[0006] Secondly, this application provides a control method for a microgrid system, applied to a target energy storage converter in the microgrid system. The method includes: acquiring operating status information of at least some energy storage converters and electrical parameters of the bus in the microgrid system; wherein the microgrid system includes multiple energy storage converters; at least some of the multiple energy storage converters are the target energy storage converter, and at least some of the multiple energy storage converters are configured to have a communication connection with the target energy storage converter; when the electrical parameters of the bus indicate that the microgrid system is in an abnormal operating state, generating a corresponding adjustment factor based on the operating status information of the target energy storage converter itself and the acquired operating status information; wherein the adjustment factor is an adjustment coefficient for active power compensation; adjusting the active power based on the corresponding adjustment factor, so that the microgrid system is adjusted to a normal operating state.

[0007] Thirdly, embodiments of this application provide an energy storage converter for a microgrid system. The energy storage converter is configured to communicate with other energy storage converters in the microgrid system. The energy storage converter includes a power conversion circuit and a converter controller. The converter controller acquires the operating status information of the corresponding energy storage converter and the electrical parameters of the bus through the communication connection. When the electrical parameters of the bus indicate that the microgrid system is in an abnormal operating state, an adjustment factor is generated based on the operating status information of the energy storage converter itself and the acquired operating status information. The active power of the power conversion circuit is adjusted based on the adjustment factor to bring the microgrid system back to normal operating status. The adjustment factor is an adjustment coefficient for the active power compensation.

[0008] Fourthly, embodiments of this application provide an electronic device, including a memory and a processor, wherein the memory stores at least one computer program, and the at least one computer program is loaded and executed by the processor to implement the control method of the microgrid system as described above.

[0009] In several embodiments provided in this application, a target energy storage converter among multiple energy storage converters is enabled to acquire operating status information of other energy storage converters and electrical parameters of the bus. When the microgrid system is in an abnormal operating state, it generates an adjustment factor based on its own operating status and the acquired operating status information, and adjusts its output power accordingly. This allows the target energy storage converter in the microgrid system to automatically adjust its power based on its own operating status information and the acquired operating status information without relying on a central controller. This enables the microgrid system to quickly recover to a steady state when it is in an abnormal operating state, thereby improving the stability of the microgrid system. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of a microgrid system provided as an embodiment of the present application.

[0012] Figure 2 This is a schematic diagram of the outer loop control of a virtual synchronizer provided as an embodiment of this application.

[0013] Figure 3 A flowchart of a control method for a microgrid system provided in one embodiment of this application.

[0014] Figure 4 This is a schematic diagram of a module of an electronic device provided in one embodiment of this application. Detailed Implementation

[0015] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0016] In the description of the embodiments of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0017] In related technologies, microgrid systems are gradually becoming an important component of power systems, used to integrate distributed power sources and energy storage systems to improve the stability and reliability of power systems. A microgrid system can include energy storage converters and a central controller. The energy storage converters can communicate with the central controller and receive control commands from it, enabling centralized control of multiple energy storage converters within the microgrid system. Specifically, when a fault disturbance in the microgrid system causes abnormal operation, the central controller collects the operating information of each energy storage converter within the microgrid system and uniformly issues control commands to adjust the output power of each energy storage converter, restoring the system to normal operation. Especially when the microgrid system is off-grid, due to the disconnection from the public grid, large disturbances caused by faults without the support of the public grid can lead to transient instability in the microgrid system. Furthermore, due to the differences in dynamic regulation capabilities among multiple grid-connected energy storage devices in a microgrid system, synchronous instability may occur between these devices.

[0018] However, after in-depth research, the researchers found that under the centralized control scheme, especially when there are a large number of energy storage converters in the microgrid system, the central controller has difficulty making power regulation decisions quickly and accurately due to the long communication path and large data transmission delay.

[0019] Please see Figure 1In some embodiments, a microgrid system may include a bus and a grid-based energy storage device. The grid-based energy storage device may include an energy storage converter and energy storage units. Energy storage units may be physical energy storage units, chemical energy storage units, electromagnetic energy storage units, etc. Physical energy storage units may be compressed air energy storage units, flywheel energy storage units, etc. Chemical energy storage units may be lithium battery units, lead-acid battery units, sodium-sulfur battery units, etc. Electromagnetic energy storage units may be supercapacitor energy storage units, superconducting energy storage units, etc. The energy storage converter is connected between the energy storage units and the bus. The energy storage converter enables the flow of electrical energy from the energy storage units to the bus, and also enables the flow of electrical energy from the bus to the energy storage units. The energy storage converter exhibits voltage source characteristics and may further include a converter controller and a power conversion circuit. The converter controller controls the power conversion circuit and is equipped with a grid-based control strategy, enabling it to actively establish and maintain the voltage and frequency of the microgrid system at normal levels even without the support of a public power grid. Grid-based control strategies include, but are not limited to, droop control strategies and virtual synchronous generator (VSG) control strategies. In some embodiments, a microgrid system may include multiple grid-based energy storage devices, and the converter controllers of the multiple grid-based energy storage devices can communicate with each other, with the power conversion circuits of the multiple grid-based energy storage devices connected in parallel to the bus.

[0020] One embodiment of this application provides a microgrid system. The microgrid system may include a bus and multiple energy storage converters connected to the bus.

[0021] In this embodiment, at least some of the plurality of energy storage converters are target energy storage converters, and at least some of the plurality of energy storage converters are configured to have a communication connection with the target energy storage converter. The target energy storage converter can acquire the electrical parameters of the bus and obtain the operating status information of the corresponding energy storage converter through the communication connection. When the electrical parameters of the bus indicate that the microgrid system is in an abnormal operating state, each target energy storage converter can generate a corresponding adjustment factor based on its own operating status information and the acquired operating status information, and each target energy storage converter adjusts the active power based on the corresponding adjustment factor, so that the microgrid system is adjusted to a normal operating state. The adjustment factor is an adjustment coefficient for the active power compensation.

[0022] In this embodiment, the target energy storage converter can acquire the operating status information of multiple energy storage converters, including itself, in real time or near real time via a communication link, thus achieving communication connectivity. The operating status information may include, but is not limited to, real-time output active power, reactive power, power angle information, grid frequency, or the state of charge of the energy storage units—statistics characterizing the operating condition of the energy storage converter. Furthermore, the target energy storage converter can continuously monitor the electrical parameters of the bus, including but not limited to bus voltage, bus frequency, and bus power angle information.

[0023] In this embodiment, when the microgrid system is in normal operation, each target energy storage converter monitors the operating status of the microgrid system based on continuously acquired operating status information of itself and other energy storage converters, as well as the electrical parameters of the bus. When a target energy storage converter detects that the electrical parameters of the bus exceed a preset normal range and determines that the microgrid system has entered an abnormal operating state, the target energy storage converter calculates its own adjustment factor relative to other energy storage converters based on its own operating status information and the operating status information obtained from other energy storage converters.

[0024] In this embodiment, the adjustment factor characterizes the active power adjustment range required by the target energy storage converter to restore the microgrid system to normal operation. Specifically, the target energy storage converter can first determine the differences in its operating state with other energy storage converters, such as power angle difference, frequency difference, or active power output difference, and then calculate the corresponding adjustment factor based on the differences. Each target energy storage converter then autonomously adjusts its own active power according to the generated adjustment factor, that is, by coordinating active power, the power output among the grid-type energy storage devices in the microgrid system tends to be coordinated and consistent.

[0025] In this embodiment, the information interaction methods of the target energy storage converter differ under different operating states: During normal operation, the target energy storage converter interacts with information according to a preset fixed cycle, enabling each converter to periodically share operating status information; however, when the target energy storage converter enters an abnormal operating state, information interaction is triggered by events. Specifically, when the bus voltage or bus frequency exceeds a specified range, the target energy storage converter immediately triggers a communication request, sending its own operating status information to the communication link, thereby completing rapid data interaction based on events. This allows multiple energy storage converters in the microgrid system to share operating status information in a short time, reducing delays caused by fixed-cycle communication.

[0026] In the various embodiments provided in this application, by enabling the target energy storage converter among multiple energy storage converters connected to the same bus to obtain the operating status information of other energy storage converters and the electrical parameters of the bus, and when the microgrid system is in an abnormal operating state, an adjustment factor is generated based on the target energy storage converter itself and the obtained operating status information, and the active power is adjusted accordingly. This allows the target energy storage converter in the microgrid system to automatically adjust the active power based on its own operating status information and the obtained operating status information without relying on a central controller. This enables the microgrid system to quickly recover to a steady state when it is in an abnormal operating state, thereby improving the stability of the microgrid system.

[0027] In some embodiments, the target energy storage converter caches its own power angle information; when the electrical parameters of the bus indicate that the microgrid system is in an abnormal operating state, the target energy storage converter saves the power angle information cached before the abnormal operating state as the target power angle information, and when the microgrid system is adjusted back to normal operating state, the target energy storage converter adjusts its own power angle to the power angle represented by the target power angle information.

[0028] In this embodiment, the target energy storage converter can continuously calculate and cache its own power angle information, which characterizes the power angle corresponding to the active power output of the target energy storage converter. Specifically, the power angle information can be obtained by integrating the grid frequency signal inside the energy storage converter. When the microgrid system is in normal operation, the target energy storage converter continuously updates this power angle information to reflect its current active power output status.

[0029] In this embodiment, when the target energy storage converter determines that the microgrid system has entered an abnormal operating state based on the detected electrical parameters of the bus, the target energy storage converter will temporarily store the power angle information corresponding to the moment before entering the abnormal state, and save it as the target power angle information. This target power angle information is used to represent the stable output power angle state of the target energy storage converter before the microgrid system disturbance occurs.

[0030] In this embodiment, as the microgrid system gradually recovers to normal operation through power regulation by each target energy storage converter, each target energy storage converter can gradually adjust its current output power angle to the power angle represented by the target power angle information at a preset recovery rate, so as to maintain the consistency of the power output state of the microgrid system before and after recovery. To avoid microgrid system oscillations caused by rapid changes in power angle during the recovery process, a control strategy that limits the slope can be adopted in the power angle adjustment process, such as limiting the power angle change rate to no more than 1 rad / s, thereby achieving a smooth transition.

[0031] In some embodiments, the electrical parameters of the bus include bus voltage and bus frequency; the microgrid system being in an abnormal operating state includes: the bus voltage not being within a specified voltage range; or, the bus frequency not being within a specified frequency range; or, the bus voltage not being within a specified voltage range and the bus frequency not being within a specified frequency range.

[0032] In this embodiment, the electrical parameters of the bus can be used to characterize the real-time operating status of the microgrid system, specifically including bus voltage and bus frequency. Here, bus voltage is the voltage amplitude of the bus within the microgrid system, and bus frequency is the operating frequency of the AC voltage signal on the bus.

[0033] In some embodiments, the target energy storage converter continuously monitors the bus voltage and bus frequency. When the target energy storage converter detects that the bus voltage is not within the specified voltage range, i.e., the bus voltage is higher than the upper threshold of the specified voltage range or lower than the lower threshold of the specified voltage range, the target energy storage converter determines that the microgrid system has entered an abnormal operating state. At this time, the target energy storage converter needs to perform power regulation to restore the microgrid system to a normal state.

[0034] In some embodiments, when the target energy storage converter detects that the bus frequency is not within the specified frequency range, that is, when the bus frequency exceeds the upper limit threshold of the specified frequency range or is lower than the lower limit threshold of the specified frequency range, the target energy storage converter also determines that the microgrid system has entered an abnormal operating state and needs to perform power regulation to restore the system to normal.

[0035] In some embodiments, when the bus voltage is not within a specified voltage range and the bus frequency is not within a specified frequency range, the target energy storage converter determines that the microgrid system has entered an abnormal operating state and adjusts the output power accordingly to restore the microgrid system to a stable operating state. This improves the accuracy of identifying abnormal operating states.

[0036] In the various embodiments provided in this application, by clearly defining the steady-state operating range of electrical parameters such as bus voltage and bus frequency when the microgrid system is in a steady state, the target energy storage converter can quickly and accurately determine the specific reasons and extent to which the microgrid system enters an abnormal operating state, thereby further adjusting the power output and quickly restoring the microgrid system to a steady state.

[0037] In some embodiments, the operating status information includes power angle information; each target energy storage converter calculates the sum of its own power angle information and the power angle difference of each power angle information in the acquired operating status information as the total power angle difference; and generates an adjustment factor corresponding to the target energy storage converter based on the total power angle difference.

[0038] In this embodiment, the operating status information acquired by the target energy storage converter includes power angle information from other energy storage converters. This power angle information characterizes the power angle corresponding to the output active power of each energy storage converter. When determining the adjustment factor, the target energy storage converter calculates the power angle difference between its own power angle information and the power angle information acquired from the other energy storage converters. Specifically, the power angle difference refers to the difference between the target energy storage converter's own power angle information and the power angle information of other energy storage converters, representing the power output phase difference of the target energy storage converter relative to the other energy storage converters.

[0039] In this embodiment, each target energy storage converter sums all the power angle differences between its own power angle information and the power angle information of the other energy storage converters to obtain the total power angle difference. This total power angle difference comprehensively characterizes the overall power output state difference between the target energy storage converter and other energy storage converters in the microgrid system. A larger absolute value of the total power angle difference indicates a greater difference in operating state between the target energy storage converter and other energy storage converters, requiring a larger adjustment range for power regulation.

[0040] Specifically, the target energy storage converter can be based on the formula:

[0041]

[0042] The total work angle difference δ is calculated. icount Where n is the total number of energy storage converters in the microgrid system; i represents the target energy storage converter; j represents the energy storage converters in the microgrid system other than the target energy storage converter; δ i δ represents the power angle of the target energy storage converter i; j D represents the power angle of energy storage converter j; ij This indicates whether data communication occurs between target energy storage converter i and energy storage converter j. When data communication occurs, D... ij The value of D is 1, when there is no data communication between the two. ij The value of 0 can also be understood as the target energy storage converter i being able to obtain the operating status information of the energy storage converter that has data communication.

[0043] In some embodiments, the target energy storage converter calculates the product between a specified proportional value and a sign function value to obtain the adjustment factor; wherein, the specified proportional value is the ratio of the difference between the first coefficient and the second coefficient to the sum of the first coefficient and the second coefficient; the first coefficient is a power of the mean power angle difference with Euler's number as the base; the second coefficient is a power of the reciprocal of the mean power angle difference with Euler's number as the base; the sign function value is a specified sign function value, wherein when the total power angle difference is greater than 0, the sign function value is 1, and when the total power angle difference is less than 0, the sign function value is -1.

[0044] In this embodiment, the target energy storage converter can be based on the total power angle difference δ. icount The specific function form can be:

[0045]

[0046] Where e is the Euler number; N is the total number of energy storage converters communicating with the target energy storage converter i; sgn() is the sign function, when the total power angle difference δ icount When greater than 0, sgn(δ) icount The value is 1, when the total power angle difference δ icount When less than 0, sgn(δ) icount The value is -1. The above function uses a hyperbolic tangent function, which has the advantages of rapid slope change and fast convergence speed, thus enabling the target energy storage converter to efficiently achieve power regulation under abnormal operating conditions. Where the total power angle difference δ_icount is greater than 0, it indicates that the power angle of the target energy storage converter is leading, and the total power angle difference δ icount A value less than 0 indicates the power consumption of the target energy storage converter after the corner.

[0047] In several embodiments provided in this application, by enabling the target energy storage converter to calculate the total power angle difference based on its own power angle information and the power angle information obtained from other energy storage converters, and generating an adjustment factor in a nonlinear manner based on the total power angle difference, the target energy storage converter can accurately determine the magnitude of its own power regulation, and more effectively reduce the power output difference between it and other energy storage converters.

[0048] In one specific embodiment, each target energy storage converter can be controlled using a Virtual Synchronous Generator (VSG) to regulate power. (See attached...) Figure 2 As shown, the target energy storage converter will use the grid connection frequency ω from its own operating status information. n The frequency difference between the reference grid frequency ω of the microgrid system and the frequency difference is expressed by the frequency difference and the adjustment gain K. fThe product of these values ​​yields the regulated power value, which is then superimposed onto the active power reference value P. ref The target power reference value is obtained. The target energy storage converter then compares the target power reference value with its actual output active power P. e The power error is obtained by comparison. Furthermore, the target energy storage converter further calculates its own power angle information and the total power angle difference δ between the power angle information of other energy storage converters. icount And based on the total power angle difference δ icount The generated adjustment factor K δi Total work angle difference δ icount The power adjustment is obtained after multiplication. This power adjustment is then added to the power error to achieve power synchronization with other energy storage converters. The target energy storage converter transforms the aforementioned power error using the generator swing equation of a virtual synchronous generator to obtain the power angle information theta, and controls the power conversion circuit of the target energy storage converter.

[0049] Please see Figure 3 This application provides a control method for a microgrid system. The control method is applied to a target energy storage converter within the microgrid system. The control method may include the following steps.

[0050] Step S110: Obtain the operating status information of at least some of the energy storage converters and the electrical parameters of the bus in the microgrid system; wherein, the microgrid system includes multiple energy storage converters; at least some of the multiple energy storage converters are the target energy storage converters, and at least some of the multiple energy storage converters are configured to have a communication connection with the target energy storage converter.

[0051] Step S120: When the electrical parameters of the bus indicate that the microgrid system is in an abnormal operating state, a corresponding adjustment factor is generated based on the operating status information of the target energy storage converter and the acquired operating status information; wherein, the adjustment factor is the adjustment coefficient of the active power compensation.

[0052] Step S130: Adjust the output power based on the corresponding adjustment factor to bring the microgrid system to normal operation.

[0053] In this embodiment, the functions and effects achieved by the control method of the microgrid system can be explained in conjunction with the foregoing embodiments, and will not be repeated here.

[0054] This application provides an energy storage converter for a microgrid system. The energy storage converter is configured to communicate with other energy storage converters in the microgrid system; the energy storage converter includes a power conversion circuit and a converter controller.

[0055] The converter controller acquires the operating status information of the corresponding energy storage converter and the electrical parameters of the bus through a communication connection. When the electrical parameters of the bus indicate that the microgrid system is in an abnormal operating state, an adjustment factor is generated based on the operating status information of the energy storage converter itself and the acquired operating status information. The active power of the power conversion circuit is adjusted based on the adjustment factor to bring the microgrid system back to normal operating status. The adjustment factor is a coefficient for adjusting the active power compensation.

[0056] In this embodiment, the energy storage converter can be used as the target energy storage converter in the aforementioned embodiments. The specific functions and effects can be explained in conjunction with the aforementioned multiple embodiments, and will not be repeated here.

[0057] This application also provides a readable storage medium for storing the methods or algorithms provided in the above embodiments. Examples include random access memory (RAM), flash memory, read-only memory (ROM), EPROM, non-volatile read-only memory (Electronic Programmable ROM), registers, hard disks, removable disks, or any other form of storage medium in the art.

[0058] Please see Figure 4 This application also provides an electronic device, including a memory and a processor. The memory stores at least one computer program, which is loaded and executed by the processor to implement the control method for the microgrid system as described above.

[0059] In this embodiment, a memory is communicatively connected to one or more processors. The memory stores a computer program that can be executed by the one or more processors. The computer program is executed by the one or more processors to enable the one or more processors to implement the control method of the microgrid system as described above. The memory can be random access memory (RAM), flash memory, read-only memory (ROM), EPROM, non-volatile read-only memory (EPROM), registers, hard disk, removable disk, etc.

[0060] In some embodiments, the electronic device may include a processor, a memory, and a communication interface, etc. The memory may store computer programs.

[0061] In this embodiment, the functions and effects achieved by the electronic device can be explained in comparison with the aforementioned embodiments, and will not be repeated here.

[0062] It is understood that the term "connection" in the embodiments of this application can be interpreted as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc. can transmit electrical signals or data to each other.

[0063] It is understood that the specific examples in this document are only intended to help those skilled in the art better understand the embodiments of this application, and are not intended to limit the scope of the invention.

[0064] It is understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0065] It is understood that the various embodiments described in this application can be implemented individually or in combination, and the embodiments of this application are not limited in this respect.

[0066] Unless otherwise stated, all technical and scientific terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items. The singular forms "a," "the," and "the" as used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0067] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0068] The above description is merely a specific embodiment of this application, but the scope of protection of this invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this invention should be determined by the scope of the claims.

Claims

1. A microgrid system, characterized by, The method comprises: a bus; a plurality of energy storage converters connected to the bus; wherein at least part of the plurality of energy storage converters is a target energy storage converter, and at least part of the plurality of energy storage converters is configured to have a communication connection with the target energy storage converter; the target energy storage converter can obtain electrical parameters of the bus, and obtain operating state information of the corresponding energy storage converter through the communication connection; wherein, in the case that the electrical parameters of the bus indicate that the microgrid system is in an abnormal working state, each target energy storage converter can generate a corresponding adjustment factor according to its own operating state information and the obtained operating state information, and each target energy storage converter adjusts active power based on the corresponding adjustment factor, so that the microgrid system is adjusted to a normal operating state; wherein the adjustment factor is an adjustment coefficient of active power compensation.

2. The microgrid system of claim 1, wherein, The electrical parameters of the bus include bus voltage and bus frequency; The microgrid system is in an abnormal working state, including: the bus voltage is not in a specified voltage range; or, The bus frequency is not in a specified frequency range; or, The bus voltage is not in a specified voltage range, and the bus frequency is not in a specified frequency range.

3. The microgrid system of claim 1, wherein, The operating state information includes power angle information; Each target energy storage converter calculates the sum of its own power angle information and the power angle difference of each power angle information in the obtained operating state information as the total power angle difference; The target energy storage converter generates a corresponding adjustment factor based on the total power angle difference.

4. The microgrid system of claim 3, wherein, The target energy storage converter calculates the product between a specified proportion value and a sign function value to obtain the adjustment factor; wherein the specified proportion value is the difference between a first coefficient and a second coefficient, and the proportion of the sum of the first coefficient and the second coefficient; the first coefficient is based on Euler number as the base number and the power angle difference average as the power; the second coefficient is based on Euler number as the base number and the inverse of the power angle difference average as the power; the sign function value is the value of a specified sign function, wherein when the total power angle difference is greater than 0, the sign function value is 1, and when the total power angle difference is less than 0, the sign function value is -1.

5. The microgrid system of claim 1, wherein, In the case that the microgrid system is adjusted to a normal operating state, the target energy storage converter adjusts its power angle to the power angle before the abnormal working state.

6. A control method of a microgrid system, characterized by, The method applied to a target energy storage converter in a microgrid system, the method comprising: obtaining the operating state information of at least part of the energy storage converters in the microgrid system and the electrical parameters of the bus; wherein the microgrid system comprises a plurality of energy storage converters; at least part of the plurality of energy storage converters is the target energy storage converter, and at least part of the plurality of energy storage converters is configured to have a communication connection with the target energy storage converter; In a case where the electrical parameter of the bus indicates that the micro-grid system is in an abnormal working state, a corresponding adjustment factor is generated according to the running state information of the target energy storage converter itself and the obtained running state information; wherein the adjustment factor is a regulation coefficient of active power compensation amount; Based on the corresponding adjustment factor, the active power is adjusted, so that the micro-grid system is adjusted to a normal working state.

7. The method of claim 6, wherein, The electrical parameter of the bus includes bus voltage and bus frequency; The micro-grid system being in an abnormal working state includes: the bus voltage is not in a specified voltage range; or, The bus frequency is not in a specified frequency range; or, The bus voltage is not in a specified voltage range, and the bus frequency is not in a specified frequency range.

8. The method of claim 6, wherein, The step of generating a corresponding adjustment factor according to the running state information of the target energy storage converter itself and the obtained running state information includes: The sum of the power angle difference between the power angle information of the target energy storage converter itself and each power angle information in the obtained running state information is calculated as a total power angle difference; The corresponding adjustment factor of the target energy storage converter is generated based on the total power angle difference.

9. The method of claim 8, wherein, The corresponding adjustment factor of the target energy storage converter is generated based on the total power angle difference, including: The product of a specified proportion value and a sign function value is calculated to obtain the adjustment factor; wherein the specified proportion value is the difference between a first coefficient and a second coefficient, and the proportion of the sum of the first coefficient and the second coefficient; the first coefficient is based on Euler number as the base number and the power angle difference average as the power; the second coefficient is based on Euler number as the base number and the inverse of the power angle difference average as the power; the sign function value is the value of a specified sign function, wherein the sign function value is 1 when the total power angle difference is greater than 0, and the sign function value is -1 when the total power angle difference is less than 0.

10. The method of claim 6, wherein, The method further includes: The power angle information is calculated and cached according to the running state information of the target energy storage converter itself; In a case where the electrical parameter of the bus indicates that the micro-grid system is in an abnormal working state, the power angle information cached before the abnormal working state is saved as target power angle information; In a case where the micro-grid system is adjusted to a normal working state, the power angle of the target energy storage converter is adjusted to the power angle represented by the target power angle information.

11. An energy storage converter for a microgrid system, the energy storage converter comprising: The energy storage converter is configured to be communicatively connected with the remaining energy storage converters in the micro-grid system; the energy storage converter includes: a power conversion circuit and a converter controller; The converter controller obtains the running state information of the corresponding energy storage converter and the electrical parameter of the bus through the communication connection; wherein in a case where the electrical parameter of the bus indicates that the micro-grid system is in an abnormal working state, an adjustment factor is generated according to the running state information of the energy storage converter itself and the obtained running state information; based on the adjustment factor, the active power of the power conversion circuit is adjusted, so that the micro-grid system is adjusted to a normal working state; wherein the adjustment factor is a regulation coefficient of active power compensation amount.

12. An electronic device, comprising: The micro-grid system comprises a memory and a processor, at least one computer program is stored in the memory, the at least one computer program is loaded and executed by the processor to realize the control method of the micro-grid system as claimed in any one of claims 6 to 10.

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