Distributed energy storage off-grid operation control method and system based on multi-machine parallel connection

Abstract

The invention relates to the technical field of power grid systems, and discloses a distributed energy storage off-grid operation control method and system based on multi-machine parallel connection, and the method comprises the steps: obtaining the operation parameters of each energy storage converter, constructing different mathematical models, and constructing an overall topological structure in combination with a connected load structure, therefore, control parameters of a mathematical model corresponding to each energy storage converter are optimized, efficient parallel operation of the multiple energy storage converters can be ensured, then a load sharing strategy is introduced, load information corresponding to each energy storage converter is acquired in real time, the power demand of each load in different application scenes can be known globally, and the power demand of each load in different application scenes can be acquired in real time. According to the load requirement and the operation state of the energy storage converter, the power distribution can be dynamically adjusted, so that the distributed energy storage off-grid system can stably operate under various working conditions, the condition of unbalanced power distribution is avoided, and the reliability of parallel off-grid operation is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid systems, and in particular to a distributed energy storage off-grid operation control method and system based on multi-machine parallel connection. Background Art

[0002] In remote areas or certain specific situations, the power system needs to operate independently in off-grid mode. In order to improve the stability of the power system, multiple energy storage inverters are usually operated in parallel. However, the parallel operation of multiple energy storage inverters is prone to uneven power distribution, causing failure of some energy storage inverters, which in turn leads to low reliability of off-grid operation. Summary of the invention

[0003] The present invention provides a distributed energy storage off-grid operation control method based on multiple machines in parallel, aiming to solve the technical problem in the prior art that when multiple energy storage converters are operated in parallel, uneven power distribution may occur, causing failure of some energy storage converters, thereby resulting in low reliability of off-grid operation.

[0004] The present invention provides a distributed energy storage off-grid operation control method based on multiple machines in parallel, comprising:

[0005] Acquire operating parameters of a plurality of first energy storage converters in a distributed energy storage off-grid system, and construct a mathematical model of each first energy storage converter according to the operating parameters;

[0006] Constructing an overall topology structure according to the plurality of first energy storage converters and any loads connected to each of the first energy storage converters, and determining control parameters of mathematical models corresponding to the plurality of first energy storage converters according to the overall topology structure;

[0007] Performing parameter control on the first energy storage converter according to the control parameter, and defining the first energy storage converter after the parameter control as the second energy storage converter;

[0008] Acquire multiple load information connected to multiple second energy storage converters according to the overall topology structure;

[0009] Obtaining the load power demand corresponding to each load information and the corresponding operating status of the second energy storage converter;

[0010] The power of the plurality of second energy storage converters is dynamically adjusted according to the load power demand and the operating status of the second energy storage converters.

[0011] Preferably, the step of obtaining the operating parameters of the first energy storage converters in the plurality of distributed energy storage off-grid systems and constructing a mathematical model of each first energy storage converter according to the operating parameters comprises:

[0012] Acquire historical operating parameters of each first energy storage converter within a preset time period, wherein the historical operating parameters include historical output current, historical output voltage, and historical output power;

[0013] Acquire current operating parameters of each first energy storage converter, wherein the current operating parameters include current output current, current output voltage, and current output power;

[0014] Vectorizing the historical operating parameters to obtain a plurality of first vectors, and constructing a historical parameter matrix according to the first vectors;

[0015] Vectorize the current running parameters to obtain multiple second vectors, and construct a current parameter matrix according to the second vectors;

[0016] Compare the historical parameter matrix with the current parameter matrix to obtain a comparison matrix;

[0017] Model building parameters are determined based on the comparison matrix, and a mathematical model of each first energy storage converter is determined according to the model building parameters.

[0018] Preferably, the step of constructing an overall topology structure according to the plurality of first energy storage converters and any loads connected to each first energy storage converter, and determining control parameters of mathematical models corresponding to the plurality of first energy storage converters according to the overall topology structure comprises:

[0019] Acquire a connection relationship among a plurality of first energy storage converters, and use the plurality of first energy storage converters as first nodes according to the connection relationship;

[0020] Obtain load information of the plurality of first energy storage converters connected thereto, and use the load information as a second node connected to the first node;

[0021] Constructing an overall topological structure according to the connection relationship, the first node, and the second node;

[0022] Acquire the number of second nodes corresponding to each first node and specification information of each second node according to the overall topology structure;

[0023] Obtain a mapping relationship table between the first energy storage converter and the load, and obtain the weights corresponding to the number of second nodes and the specification information of the second nodes according to the mapping relationship table;

[0024] Obtain the total number of first nodes according to the overall topological structure;

[0025] Determine the proportion of each first node in the overall topology structure according to the total number of first nodes and the number and weight of second nodes corresponding to each first node;

[0026] The overall operation requirement is obtained, and the control parameter of the mathematical model corresponding to each first node is determined according to the overall operation requirement and the proportion of each first node in the overall topological structure.

[0027] Preferably, the step of dynamically adjusting the power of the plurality of second energy storage converters according to the load power demand and the operating state of the second energy storage converter comprises:

[0028] Obtain the total power requirements of the distributed energy storage off-grid system;

[0029] Obtaining the power proportion of each second energy storage converter in the distributed energy storage off-grid system according to the overall topology structure and the load power demand corresponding to each second energy storage converter;

[0030] Corresponding powers are allocated to the plurality of second energy storage converters according to the total power requirement and the power proportion.

[0031] Preferably, after the step of allocating corresponding power to the plurality of second energy storage converters according to the total power requirement and the power proportion, the method further comprises:

[0032] Obtaining the operating status of each second energy storage converter;

[0033] Determine the real-time power of the connected load according to the operating state of the second energy storage converter, wherein the connected load is any number;

[0034] Determining whether to disconnect the load corresponding to the real-time power according to the real-time power of the connected load and the operating state of the second energy storage converter;

[0035] If it is determined that the load corresponding to the real-time power is disconnected, the load corresponding to the disconnection is used as the target load, and the corresponding second energy storage converter is used as the first target energy storage converter, and a second energy storage converter adjacent to the first target energy storage converter that meets the target load access condition is obtained according to the overall topology structure, and the adjacent second energy storage converter is used as the second target energy storage converter;

[0036] The target load is connected to a second target energy storage converter, and the power of the second target energy storage converter is dynamically adjusted according to the total power requirement and the load power demand of the target load.

[0037] Preferably, the step of acquiring a second energy storage converter adjacent to the first target energy storage converter and satisfying the target load access condition according to the overall topology structure, and using the adjacent second energy storage converter as the second target energy storage converter comprises:

[0038] Acquire multiple sets according to the overall topology structure, wherein each set includes any loads corresponding to each second energy storage converter and connected thereto;

[0039] Get the overall power of each collection run;

[0040] Traverse all sets and determine whether there is redundant space in each set based on the total power requirement and overall power;

[0041] If at least one set has redundant space, determining whether the set with redundant space accessing the target load exceeds a preset requirement;

[0042] The set of redundant spaces that are connected to the target load and do not exceed the preset requirement is taken as a target set, and it is determined whether the target set is at least two;

[0043] If there are at least two target sets, the second energy storage converter corresponding to the target set that is closest to the second target energy storage converter is selected as the second target energy storage converter according to the overall topology structure.

[0044] Preferably, after the step of dynamically adjusting the power of the plurality of second energy storage converters according to the load power demand and the operating state of the second energy storage converter, the method further includes:

[0045] Monitor the operating status of each second energy storage converter in real time, and determine whether the second energy storage converter is abnormal according to the operating status;

[0046] If the second energy storage converter is abnormal, obtaining the operating power of the load connected to the second energy storage converter;

[0047] Determine whether the load is faulty based on the load's operating power;

[0048] If there is a fault in the load, fault information corresponding to the load is generated.

[0049] Preferably, after the step of generating fault information corresponding to the load, the method further comprises:

[0050] Obtain the protection mechanism corresponding to the load according to the fault information;

[0051] Acquire protection operation parameters of the second energy storage converter corresponding to the load according to the protection mechanism;

[0052] The control parameters of the mathematical model corresponding to the second energy storage converter are adjusted according to the protection operation parameters to protect the second energy storage converter and the load connected to the second energy storage converter.

[0053] The present invention also provides a distributed energy storage off-grid operation control system based on multiple machines in parallel, comprising:

[0054] A first acquisition module is used to acquire operating parameters of multiple first energy storage converters in the distributed energy storage off-grid system, and to construct a mathematical model of each first energy storage converter according to the operating parameters;

[0055] A construction module, used to construct an overall topology structure according to the plurality of first energy storage converters and any loads connected to each of the first energy storage converters, and determine control parameters of the mathematical model corresponding to the plurality of first energy storage converters according to the overall topology structure;

[0056] A control module, used for performing parameter control on the first energy storage converter according to the control parameters, and defining the first energy storage converter after the parameter control as the second energy storage converter;

[0057] A second acquisition module is used to acquire multiple load information connected to multiple second energy storage converters according to the overall topology structure;

[0058] A third acquisition module is used to obtain the load power demand corresponding to each load information and the corresponding operating status of the second energy storage converter;

[0059] The adjustment module is used to dynamically adjust the power of the plurality of second energy storage converters according to the load power demand and the operating status of the second energy storage converters.

[0060] Preferably, the first acquisition module includes:

[0061] A first acquisition unit, used to acquire historical operating parameters of each first energy storage converter within a preset time period, wherein the historical operating parameters include historical output current, historical output voltage, and historical output power;

[0062] A second acquisition unit is used to acquire current operating parameters of each first energy storage converter, wherein the current operating parameters include current output current, current output voltage, and current output power;

[0063] A first construction unit is used to vectorize the historical operation parameters to obtain a plurality of first vectors, and to construct a historical parameter matrix according to the first vectors;

[0064] A second construction unit is used to vectorize the current operating parameters to obtain a plurality of second vectors, and construct a current parameter matrix according to the second vectors;

[0065] A comparison unit, used for comparing the historical parameter matrix with the current parameter matrix to obtain a comparison matrix;

[0066] A model building unit is used to determine model building parameters based on the comparison matrix, and determine the mathematical model of each first energy storage converter according to the model building parameters.

[0067] The beneficial effects of the present invention are:

[0068] The operating parameters of each energy storage inverter in the distributed energy storage off-grid system are obtained, different mathematical models are constructed according to the operating characteristics, and the overall topological structure is constructed by combining multiple energy storage inverters and the connected load structure, so as to optimize the control parameters of the mathematical model corresponding to each energy storage inverter, and control the parameters of the energy storage inverter based on the control parameters, so as to ensure that multiple energy storage inverters can operate in parallel efficiently, and then introduce a load sharing strategy to obtain the load information corresponding to each energy storage inverter in real time, so as to understand the power demand of each load in different application scenarios from a global perspective, and dynamically adjust the power distribution according to the load demand and the operating status of the energy storage inverter, so as to ensure that the distributed energy storage off-grid system can operate stably under various working conditions, avoid the situation of unbalanced power distribution, and improve the reliability of parallel off-grid operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 The figure is a schematic diagram of a method flow according to an embodiment of the present invention.

[0070] Figure 2 FIG. 1 is a schematic diagram of a system structure according to an embodiment of the present invention.

[0071] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0072] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0073] like Figure 1 , Figure 2 As shown, the present invention provides a distributed energy storage off-grid operation control method based on multi-machine parallel connection, which is applied to a distributed energy storage off-grid system, including:

[0074] S1. Obtain operating parameters of multiple first energy storage converters in a distributed energy storage off-grid system, and construct a mathematical model of each first energy storage converter according to the operating parameters;

[0075] S2, constructing an overall topology structure according to the multiple first energy storage converters and any loads connected to each of the first energy storage converters, and determining control parameters of the mathematical model corresponding to the multiple first energy storage converters according to the overall topology structure;

[0076] S3, performing parameter control on the first energy storage converter according to the control parameter, and defining the first energy storage converter after the parameter control as the second energy storage converter;

[0077] S4. Acquire multiple load information connected to multiple second energy storage converters according to the overall topology structure;

[0078] S5, obtaining the load power demand corresponding to each load information and the corresponding operating status of the second energy storage converter;

[0079] S6. Dynamically adjust the power of the plurality of second energy storage converters according to the load power demand and the operating status of the second energy storage converters.

[0080] As described in the above steps S1-S6, the present invention first obtains the operating parameters of each energy storage converter in the distributed energy storage off-grid system. The energy storage converter can control the charging and discharging process of the battery, perform AC / DC conversion, and directly supply power to the AC load in the absence of a power grid. A controller is provided inside the energy storage converter. The controller can receive background control instructions through communication, and control the charging or discharging of the battery according to the power instruction and the power size to achieve power regulation of the power grid.

[0081] The operating parameters of the energy storage converter include DC input current, battery capacity, parallel output current, off-grid output current, communication information, energy storage converter specification information, etc. Considering the changeable application scenarios, the model, task, and connected load of the energy storage converter in the distributed energy storage off-grid system will also form different distributed connection structures according to the application scenarios. Therefore, in order to maximize the efficiency of each energy storage converter, the present invention constructs different mathematical models according to the operating characteristics of each energy storage converter, and constructs an overall topological structure in combination with multiple energy storage converters and connected load structures. When each mathematical model performs parameter control, it will refer to the overall topological structure.

[0082] It should be noted that the present invention can generate different overall topological structures according to different working conditions. Under different working conditions, a controller is provided in the distributed energy storage off-grid system, and the controller is used to control the connection or disconnection with multiple energy storage converters. The energy storage converter and the load are also connected or disconnected through a control switch. Therefore, the number of energy storage converters and the number and specifications of the loads connected thereto may change according to different working conditions. Therefore, the overall topological structure will be adjusted in real time according to the change of the number of energy storage converters and the corresponding loads.

[0083] Taking into account the overall characteristics and the characteristics of each energy storage inverter, the control parameters of the mathematical model corresponding to each energy storage inverter are optimized, and the energy storage inverter is parameter controlled based on the control parameters. This ensures that multiple energy storage inverters can operate in parallel efficiently. Then, a load sharing strategy is introduced to obtain the load information corresponding to each energy storage inverter in real time, so that the power demand of each load in different application scenarios can be understood from a global perspective. The power distribution can be dynamically adjusted according to the load demand and the operating status of the energy storage inverter, thereby ensuring that the distributed energy storage off-grid system can operate stably under various working conditions, avoiding the problem of unbalanced power distribution, and improving the reliability of parallel off-grid operation.

[0084] In one embodiment, the step S1 of obtaining the operating parameters of the first energy storage converters in the plurality of distributed energy storage off-grid systems and constructing the mathematical model of each first energy storage converter according to the operating parameters includes:

[0085] S11, obtaining historical operating parameters of each first energy storage converter within a preset time period, wherein the historical operating parameters include historical output current, historical output voltage, and historical output power;

[0086] S12, obtaining current operating parameters of each first energy storage converter, wherein the current operating parameters include current output current, current output voltage, and current output power;

[0087] S13, vectorizing the historical operating parameters to obtain a plurality of first vectors, and constructing a historical parameter matrix according to the first vectors;

[0088] S14, vectorizing the current operating parameters to obtain a plurality of second vectors, and constructing a current parameter matrix according to the second vectors;

[0089] S15, comparing the historical parameter matrix and the current parameter matrix to obtain a comparison matrix;

[0090] S16. Determine model building parameters based on the comparison matrix, and determine a mathematical model of each first energy storage converter according to the model building parameters.

[0091] As described in the above steps S11-S16, the current operating parameters and the historical operating parameters are vectorized, and the corresponding matrix is ​​constructed, which facilitates the subsequent unified processing of the data. By comparing the historical parameter matrix with the current parameter matrix and obtaining a comparison matrix, the operating change trend of each energy storage inverter can be reflected; first, a basic mathematical model can be obtained, such as a prediction model, and then the historical parameter matrix and the current parameter matrix are input into the prediction model as training samples for training. During the training process, the parameters corresponding to the fitting curve closest to the comparison matrix are found based on the least squares method or other parameter identification methods, and the parameters are determined as the construction parameters in the mathematical model, so that the generated mathematical model can reflect the actual data of the corresponding energy storage inverter to the greatest extent.

[0092] In one embodiment, the step S2 of constructing an overall topology structure according to the plurality of first energy storage converters and any loads connected to each first energy storage converter, and determining control parameters of the mathematical model corresponding to the plurality of first energy storage converters according to the overall topology structure, comprises:

[0093] S21, obtaining a connection relationship between a plurality of first energy storage converters, and using the plurality of first energy storage converters as first nodes according to the connection relationship;

[0094] S22, obtaining load information of a plurality of first energy storage converters connected thereto, and using the load information as a second node connected to the first node;

[0095] S23, constructing an overall topology structure according to the connection relationship, the first node and the second node;

[0096] S24. Acquire the number of second nodes corresponding to each first node and specification information of each second node according to the overall topology structure;

[0097] S25, obtaining a mapping relationship table between the first energy storage converter and the load, and obtaining the weights corresponding to the number of second nodes and the specification information of the second nodes according to the mapping relationship table;

[0098] S26. Obtaining the total number of first nodes according to the overall topological structure;

[0099] S27, determining the proportion of each first node in the overall topological structure according to the total number of first nodes, the number of second nodes corresponding to each first node, and the weight;

[0100] S28. Obtain overall operation requirements, and determine control parameters of the mathematical model corresponding to each first node according to the overall operation requirements and the proportion of each first node in the overall topological structure.

[0101] As described in the above steps S21-S28, in the prior art, the load information between energy storage converters cannot be shared. Usually, each energy storage converter is responsible for the load in its own area, so it is impossible to manage all loads in a unified manner, which causes unbalanced power distribution between energy storage converters. Therefore, considering the above reasons, this embodiment adopts a sharing strategy for all loads. Since different energy storage converters correspond to different mathematical models, and multiple energy storage converters need to cooperate with each other, after the mathematical model is determined, the connection relationship between multiple energy storage converters and the load information of each energy storage converter connection can be obtained, so that the whole energy storage converter can be constructed according to the connection relationship and node information. The overall topology structure can be understood according to the mapping relationship table of the overall topology structure and the energy storage converter-load, and the proportion of different energy storage converters in the overall topology structure can be understood. Specifically, the more loads connected, the higher the proportion of the corresponding energy storage converter, or the higher the weight corresponding to the load specification information, the higher the proportion, or the number and the weight are combined to determine the proportion. It can be adjusted according to the needs here, and there is no unique limitation here; then, according to the overall operation requirements of the distributed energy storage off-grid system, different control parameters of the mathematical model corresponding to different proportions are generated, so as to achieve the purpose of optimizing the control parameters and improve the stability of parallel operation of multiple energy storage converters.

[0102] In addition, it also includes real-time monitoring of the connection relationship of multiple first energy storage inverters, the change in the number of first nodes, and the change in the number of second nodes, and updating the overall topology structure according to the connection relationship, the change in the number of first nodes, and the change in the number of second nodes.

[0103] In one embodiment, the step S6 of dynamically adjusting the power of the plurality of second energy storage converters according to the load power demand and the operating state of the second energy storage converter comprises:

[0104] S61. Obtaining the total power requirement of the distributed energy storage off-grid system;

[0105] S62, obtaining the power proportion of each second energy storage converter in the distributed energy storage off-grid system according to the overall topology structure and the load power demand corresponding to each second energy storage converter;

[0106] S63. Allocate corresponding power to the plurality of second energy storage converters according to the total power requirement and the power proportion.

[0107] As described in the above steps S61-S63, since the distributed energy storage off-grid system needs to be applied in different scenarios, the total power corresponding to different scenarios is different, so the power allocated to each energy storage inverter and the corresponding load will also change. Therefore, the power demand of each load and the current operating status of the energy storage inverter can be obtained, and the corresponding power allocated to each second energy storage inverter is obtained according to the current operating status, load power demand and power ratio to load power demand, so that the distributed energy storage off-grid system can adapt to various application scenarios and operate stably.

[0108] In one embodiment, after the step S63 of allocating corresponding power to the plurality of second energy storage converters according to the total power requirement and the power proportion, the following steps are included:

[0109] S64, obtaining the operating status of each second energy storage converter;

[0110] S65, determining the real-time power of the connected load according to the operating state of the second energy storage converter, wherein the connected load is any number;

[0111] S66, judging whether to disconnect the load corresponding to the real-time power according to the real-time power of the connected load and the operating state of the second energy storage converter;

[0112] S67: If it is determined that the load corresponding to the real-time power is disconnected, the load corresponding to the disconnection is used as the target load, and the corresponding second energy storage converter is used as the first target energy storage converter, and a second energy storage converter that meets the target load access condition and is adjacent to the first target energy storage converter is obtained according to the overall topology structure, and the adjacent second energy storage converter is used as the second target energy storage converter;

[0113] S68, connecting the target load to the second target energy storage converter, and dynamically adjusting the power of the second target energy storage converter according to the total power requirement and the load power demand of the target load.

[0114] As described in the above steps S64-S68, after the power distribution is completed, the energy storage inverter can be monitored to ensure its stable operation. Specifically, the operating status of the energy storage inverter and the real-time power of the load can be monitored, and whether it is necessary to disconnect from the load can be determined based on the operating status and real-time power. Specifically, the judgment can be made based on whether the operating status is abnormal and whether the real-time power exceeds the range. If disconnection is required, in order to stabilize the overall operation, the operating status and load conditions of the adjacent energy storage inverter can be obtained, and it can be determined whether the adjacent energy storage inverter meets the access conditions. If so, the load can be connected to the target energy storage inverter. At this time, the overall topology is updated according to the access information and disconnection information, and the power adjustment information of the target energy storage inverter is regenerated to achieve dynamic power adjustment.

[0115] In one embodiment, the step S67 of acquiring a second energy storage converter adjacent to the first target energy storage converter and satisfying the target load access condition according to the overall topology structure, and using the adjacent second energy storage converter as the second target energy storage converter includes:

[0116] S671. Acquire multiple sets according to the overall topology structure, wherein each set includes any loads corresponding to each second energy storage converter and connected thereto;

[0117] S672, obtaining the overall power of each set operation;

[0118] S673, traverse all sets, and determine whether there is redundant space in each set according to the total power requirement and the overall power;

[0119] S674. If at least one set has redundant space, determine whether the set with redundant space accessing the target load exceeds a preset requirement;

[0120] S675, taking the set with redundant space that accesses the target load and does not exceed the preset requirement as the target set, and determining whether the target set is at least two;

[0121] S676: If there are at least two target sets, select the second energy storage converter corresponding to the target set that is closest to the second target energy storage converter as the second target energy storage converter according to the overall topology structure.

[0122] As described in the above steps S671-S676, the target energy storage inverter can be determined by judging whether there is redundant space in each set. When there are at least two, the energy storage inverter with the closest connection relationship in the overall topology structure can be used as the target energy storage inverter based on the proximity principle, thereby reducing operation and maintenance costs.

[0123] In one embodiment, after the step S68 of dynamically adjusting the power of the plurality of second energy storage converters according to the load power demand and the operating state of the second energy storage converter, the method further includes:

[0124] S681. Monitor the operating status of each second energy storage converter in real time, and determine whether the second energy storage converter is abnormal according to the operating status;

[0125] S682: if the second energy storage converter is abnormal, obtain the operating power of the load connected to the second energy storage converter;

[0126] S683, judging whether the load has a fault according to the operating power of the load;

[0127] S684: If there is a fault in the load, generate fault information corresponding to the load.

[0128] As described in the above steps S681-S684, in order to improve the overall stability, the present invention monitors the operating status of the energy storage inverter in real time to perform fault detection thereon. When an abnormality occurs, fault information is generated. More preferably, the fault information can be directly sent to the overall topology diagram, so that the source of the fault can be quickly identified.

[0129] In one embodiment, after step S684 of generating fault information corresponding to the load, the following steps are included:

[0130] S6841. Obtain a protection mechanism corresponding to the load according to the fault information;

[0131] S6842. Obtain protection operation parameters of the second energy storage converter corresponding to the load according to the protection mechanism;

[0132] S6843. Adjust the control parameters of the mathematical model corresponding to the second energy storage converter according to the protection operation parameters to protect the second energy storage converter and the load connected to the second energy storage converter.

[0133] As described in the above steps S6841-S6843, in order to improve the overall safety, a corresponding protection mechanism can be generated according to the fault information, and the protection operation parameters can be obtained according to the protection mechanism, and then the control parameters can be adjusted in real time according to the protection operation parameters to avoid the spread of faults in the energy storage inverter and the load due to the fault information.

[0134] The present invention also provides a distributed energy storage off-grid operation control system based on multiple machines in parallel, comprising:

[0135] A first acquisition module 1 is used to acquire operating parameters of multiple first energy storage converters in a distributed energy storage off-grid system, and to construct a mathematical model of each first energy storage converter according to the operating parameters;

[0136] Construction module 2, used to construct an overall topology structure according to the multiple first energy storage converters and any loads connected to each first energy storage converter, and determine the control parameters of the mathematical model corresponding to the multiple first energy storage converters according to the overall topology structure;

[0137] A control module 3, used for performing parameter control on the first energy storage converter according to the control parameters, and defining the first energy storage converter after the parameter control as a second energy storage converter;

[0138] A second acquisition module 4, used for acquiring multiple load information connected to multiple second energy storage converters according to the overall topology structure;

[0139] A third acquisition module 5 is used to obtain the load power demand corresponding to each load information and the corresponding operating state of the second energy storage converter;

[0140] The adjustment module 6 is used to dynamically adjust the power of the plurality of second energy storage converters according to the load power demand and the operating status of the second energy storage converters.

[0141] In one embodiment, the first acquisition module 1 includes:

[0142] A first acquisition unit, used to acquire historical operating parameters of each first energy storage converter within a preset time period, wherein the historical operating parameters include historical output current, historical output voltage, and historical output power;

[0143] A second acquisition unit is used to acquire current operating parameters of each first energy storage converter, wherein the current operating parameters include current output current, current output voltage, and current output power;

[0144] A first construction unit is used to vectorize the historical operation parameters to obtain a plurality of first vectors, and to construct a historical parameter matrix according to the first vectors;

[0145] A second construction unit is used to vectorize the current operating parameters to obtain a plurality of second vectors, and construct a current parameter matrix according to the second vectors;

[0146] A comparison unit, used for comparing the historical parameter matrix with the current parameter matrix to obtain a comparison matrix;

[0147] A model building unit is used to determine model building parameters based on the comparison matrix, and determine the mathematical model of each first energy storage converter according to the model building parameters.

[0148] It should be noted that each module and unit in the distributed energy storage off-grid operation control system based on multiple machines in parallel corresponds one-to-one to the steps in the distributed energy storage off-grid operation control method based on multiple machines in parallel.

[0149] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media provided by the present invention and used in the embodiments can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double-speed data rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0150] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, device, article or method including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, device, article or method. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the presence of other identical elements in the process, device, article or method including the element.

[0151] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A distributed energy storage off-grid operation control method based on multi-machine parallel connection, applied to a distributed energy storage off-grid system, characterized in that: include: Acquire operating parameters of a plurality of first energy storage converters in a distributed energy storage off-grid system, and construct a mathematical model of each first energy storage converter according to the operating parameters; Constructing an overall topology structure according to the plurality of first energy storage converters and any loads connected to each of the first energy storage converters, and determining control parameters of mathematical models corresponding to the plurality of first energy storage converters according to the overall topology structure; Performing parameter control on the first energy storage converter according to the control parameter, and defining the first energy storage converter after the parameter control as the second energy storage converter; Acquire multiple load information connected to multiple second energy storage converters according to the overall topology structure; Obtaining the load power demand corresponding to each load information and the corresponding operating status of the second energy storage converter; The power of the plurality of second energy storage converters is dynamically adjusted according to the load power demand and the operating status of the second energy storage converters.

2. The off-grid operation control method of distributed energy storage based on multi-machine parallel connection according to claim 1 is characterized in that: The step of obtaining the operating parameters of the first energy storage converters in the plurality of distributed energy storage off-grid systems and constructing a mathematical model of each first energy storage converter according to the operating parameters includes: Obtaining historical operating parameters of each first energy storage converter within a preset time period, wherein the historical operating parameters include historical output current, historical output voltage, and historical output power; Acquire current operating parameters of each first energy storage converter, wherein the current operating parameters include current output current, current output voltage, and current output power; Vectorizing the historical operating parameters to obtain a plurality of first vectors, and constructing a historical parameter matrix according to the first vectors; Vectorize the current running parameters to obtain multiple second vectors, and construct a current parameter matrix according to the second vectors; Compare the historical parameter matrix with the current parameter matrix to obtain a comparison matrix; Model building parameters are determined based on the comparison matrix, and a mathematical model of each first energy storage converter is determined according to the model building parameters.

3. The off-grid operation control method of distributed energy storage based on multi-machine parallel connection according to claim 1 is characterized in that: The step of constructing an overall topology structure according to the plurality of first energy storage converters and any loads connected to each first energy storage converter, and determining control parameters of mathematical models corresponding to the plurality of first energy storage converters according to the overall topology structure includes: Acquire a connection relationship among a plurality of first energy storage converters, and use the plurality of first energy storage converters as first nodes according to the connection relationship; Obtain load information of the plurality of first energy storage converters connected thereto, and use the load information as a second node connected to the first node; Constructing an overall topological structure according to the connection relationship, the first node, and the second node; Acquire the number of second nodes corresponding to each first node and specification information of each second node according to the overall topology structure; Obtain a mapping relationship table between the first energy storage converter and the load, and obtain the weights corresponding to the number of second nodes and the specification information of the second nodes according to the mapping relationship table; Obtain the total number of first nodes according to the overall topological structure; Determine the proportion of each first node in the overall topology structure according to the total number of first nodes and the number and weight of second nodes corresponding to each first node; The overall operation requirement is obtained, and the control parameter of the mathematical model corresponding to each first node is determined according to the overall operation requirement and the proportion of each first node in the overall topological structure.

4. The off-grid operation control method of distributed energy storage based on multi-machine parallel connection according to claim 1 is characterized in that: The step of dynamically adjusting the power of the plurality of second energy storage converters according to the load power demand and the operating status of the second energy storage converters comprises: Obtain the total power requirements of the distributed energy storage off-grid system; Obtaining the power proportion of each second energy storage converter in the distributed energy storage off-grid system according to the overall topology structure and the load power demand corresponding to each second energy storage converter; Corresponding powers are allocated to the plurality of second energy storage converters according to the total power requirement and the power proportion.

5. The off-grid operation control method of distributed energy storage based on multi-machine parallel connection according to claim 4 is characterized in that: After the step of allocating corresponding power to the plurality of second energy storage converters according to the total power requirement and the power proportion, the method further comprises: Obtaining the operating status of each second energy storage converter; Determine the real-time power of the connected load according to the operating state of the second energy storage converter, wherein the connected load is any number; Determining whether to disconnect the load corresponding to the real-time power according to the real-time power of the connected load and the operating state of the second energy storage converter; If it is determined that the load corresponding to the real-time power is disconnected, the load corresponding to the disconnection is used as the target load, and the corresponding second energy storage converter is used as the first target energy storage converter, and a second energy storage converter adjacent to the first target energy storage converter that meets the target load access condition is obtained according to the overall topology structure, and the adjacent second energy storage converter is used as the second target energy storage converter; The target load is connected to a second target energy storage converter, and the power of the second target energy storage converter is dynamically adjusted according to the total power requirement and the load power demand of the target load.

6. The off-grid operation control method of distributed energy storage based on multi-machine parallel connection according to claim 5 is characterized in that: The step of acquiring a second energy storage converter that meets the target load access condition and is adjacent to the first target energy storage converter according to the overall topology structure, and using the adjacent second energy storage converter as the second target energy storage converter includes: Acquire multiple sets according to the overall topology structure, wherein each set includes any loads corresponding to each second energy storage converter and connected thereto; Get the overall power of each collection run; Traverse all sets and determine whether there is redundant space in each set based on the total power requirement and overall power; If at least one set has redundant space, determining whether the set with redundant space accessing the target load exceeds a preset requirement; The set of redundant spaces that are connected to the target load and do not exceed the preset requirement is taken as a target set, and it is determined whether the target set is at least two; If there are at least two target sets, the second energy storage converter corresponding to the target set that is closest to the second target energy storage converter is selected as the second target energy storage converter according to the overall topology structure.

7. The off-grid operation control method of distributed energy storage based on multi-machine parallel connection according to claim 3 is characterized in that: After the step of dynamically adjusting the power of the plurality of second energy storage converters according to the load power demand and the operating state of the second energy storage converter, the method further includes: Monitor the operating status of each second energy storage converter in real time, and determine whether the second energy storage converter is abnormal according to the operating status; If the second energy storage converter is abnormal, obtaining the operating power of the load connected to the second energy storage converter; Determine whether the load is faulty based on the load's operating power; If there is a fault in the load, fault information corresponding to the load is generated.

8. The off-grid operation control method of distributed energy storage based on multi-machine parallel connection according to claim 7 is characterized in that: After the step of generating fault information corresponding to the load, it includes: Obtain protection mechanism corresponding to the load according to fault information; Acquire protection operation parameters of the second energy storage converter corresponding to the load according to the protection mechanism; The control parameters of the mathematical model corresponding to the second energy storage converter are adjusted according to the protection operation parameters to protect the second energy storage converter and the load connected to the second energy storage converter.

9. A distributed energy storage off-grid operation control system based on multiple machines in parallel, characterized in that: include: A first acquisition module is used to acquire operating parameters of multiple first energy storage converters in the distributed energy storage off-grid system, and to construct a mathematical model of each first energy storage converter according to the operating parameters; A construction module, used to construct an overall topology structure according to the plurality of first energy storage converters and any loads connected to each of the first energy storage converters, and determine control parameters of the mathematical model corresponding to the plurality of first energy storage converters according to the overall topology structure; A control module, used for performing parameter control on the first energy storage converter according to the control parameters, and defining the first energy storage converter after the parameter control as the second energy storage converter; A second acquisition module is used to acquire multiple load information connected to multiple second energy storage converters according to the overall topology structure; A third acquisition module is used to obtain the load power demand corresponding to each load information and the corresponding operating status of the second energy storage converter; The adjustment module is used to dynamically adjust the power of the plurality of second energy storage converters according to the load power demand and the operating status of the second energy storage converters.

10. The distributed energy storage off-grid operation control system based on multiple machines in parallel according to claim 9, characterized in that: The first acquisition module includes: A first acquisition unit, used to acquire historical operating parameters of each first energy storage converter within a preset time period, wherein the historical operating parameters include historical output current, historical output voltage, and historical output power; A second acquisition unit is used to acquire current operating parameters of each first energy storage converter, wherein the current operating parameters include current output current, current output voltage, and current output power; A first construction unit is used to vectorize the historical operation parameters to obtain a plurality of first vectors, and to construct a historical parameter matrix according to the first vectors; A second construction unit is used to vectorize the current operating parameters to obtain a plurality of second vectors, and construct a current parameter matrix according to the second vectors; A comparison unit, used for comparing the historical parameter matrix with the current parameter matrix to obtain a comparison matrix; A model building unit is used to determine model building parameters based on the comparison matrix, and determine the mathematical model of each first energy storage converter according to the model building parameters.

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