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

Abstract

The application 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, which acquires operation parameters of each energy storage converter, respectively constructs different mathematical models, and combines a connected load structure to construct an overall topological structure, so that the control parameters of the mathematical model corresponding to each energy storage converter are optimized, the multiple energy storage converters can be efficiently operated in parallel, a load sharing strategy is introduced, load information corresponding to each energy storage converter is acquired in real time, so that the power demand of each load under different application scenarios can be globally understood, the power distribution of the energy storage converter can be dynamically adjusted according to the load demand and the operation state of the energy storage converter, so that the distributed energy storage off-grid system can be stably operated under various working conditions, the situation of uneven power distribution is avoided, and the reliability of parallel off-grid operation is improved.

Description

Technical Field

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

[0002] In remote areas or under certain specific circumstances, power systems need to operate independently in off-grid mode. To improve the stability of the power system, multiple energy storage converters are usually connected in parallel. However, the parallel operation of multiple energy storage converters can easily lead to uneven power distribution, causing some energy storage converters to fail, which in turn results in low reliability of off-grid operation. Summary of the Invention

[0003] This invention provides a distributed energy storage off-grid operation control method based on multiple parallel units, aiming to solve the technical problem that uneven power distribution is prone to occur when multiple energy storage converters are connected in parallel in the prior art, which leads to the failure of some energy storage converters and thus the low reliability of off-grid operation.

[0004] This invention provides a method for controlling the off-grid operation of distributed energy storage based on multi-machine parallel operation, comprising:

[0005] Obtain the operating parameters of multiple first energy storage converters in the distributed off-grid energy storage system, and construct a mathematical model for each first energy storage converter based on the operating parameters;

[0006] The overall topology is constructed based on multiple first energy storage converters and any number of loads connected to each first energy storage converter, and the control parameters of the mathematical model corresponding to the multiple first energy storage converters are determined based on the overall topology.

[0007] The first energy storage converter is parameter controlled according to the control parameters, and the first energy storage converter after parameter control is defined as the second energy storage converter.

[0008] Based on the overall topology, obtain information on multiple loads connected to multiple second energy storage converters;

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

[0010] The power of multiple second energy storage converters is dynamically adjusted based on the load power demand and the operating status of the second energy storage converter.

[0011] Preferably, the step of obtaining the operating parameters of the first energy storage converter in multiple distributed off-grid energy storage systems and constructing a mathematical model for each first energy storage converter based on the operating parameters includes:

[0012] Obtain the historical operating parameters of each first energy storage converter within a preset time period, including historical output current, historical output voltage, and historical output power.

[0013] Obtain the current operating parameters of each first energy storage converter, including the current output current, current output voltage, and current output power;

[0014] The historical operating parameters are vectorized to obtain multiple first vectors, and a historical parameter matrix is ​​constructed based on the first vectors.

[0015] The current running parameters are vectorized to obtain multiple second vectors, and the current parameter matrix is ​​constructed based on the second vectors.

[0016] The historical parameter matrix and the current parameter matrix are compared to obtain a comparison matrix;

[0017] The model construction parameters are determined based on the comparison matrix, and the mathematical model of each first energy storage converter is determined based on the model construction parameters.

[0018] Preferably, the step of constructing an overall topology based on multiple first energy storage converters and any number of loads connected to each first energy storage converter, and determining the control parameters of the mathematical model corresponding to the multiple first energy storage converters based on the overall topology, includes:

[0019] Obtain the connection relationship of multiple first energy storage converters, and use the multiple first energy storage converters as first nodes according to the connection relationship;

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

[0021] Construct the overall topology based on the connection relationships, the first node, and the second node;

[0022] Based on the overall topology, obtain the number of second nodes corresponding to each first node and the specification information of each second node;

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

[0024] The total number of the first node is obtained based on the overall topology;

[0025] The proportion of each first node in the overall topology is determined based on the total number of first nodes, the number of second nodes corresponding to each first node, and their weights.

[0026] Obtain the overall operating requirements, and determine the control parameters of the mathematical model corresponding to each first node based on the overall operating requirements and the proportion of each first node in the overall topology.

[0027] Preferably, the step of dynamically adjusting the power of multiple second energy storage converters according to the load power demand and the operating status of the second energy storage converter includes:

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

[0029] Based on the overall topology and the load power requirements corresponding to each second energy storage converter, the power ratio of each second energy storage converter in the distributed energy storage off-grid system is obtained.

[0030] The power is allocated to the multiple second energy storage converters according to the total power requirement and power ratio.

[0031] Preferably, after the step of allocating corresponding power to the multiple second energy storage converters according to the total power requirement and power ratio, the following steps are included:

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

[0033] The real-time power of the connected loads is determined based on the operating status of the second energy storage converter, wherein the number of connected loads is arbitrary;

[0034] Determine whether to disconnect the load corresponding to the real-time power based on the real-time power of the connected load and the operating status 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 taken as the target load, the corresponding second energy storage converter is taken as the first target energy storage converter, and according to the overall topology, the second energy storage converter that meets the target load access conditions and is adjacent to the first target energy storage converter is obtained, and the adjacent second energy storage converter is taken as the second target energy storage converter.

[0036] The target load is connected to the 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 obtaining a second energy storage converter adjacent to the first target energy storage converter that meets the target load access conditions according to the overall topology, and using the adjacent second energy storage converter as the second target energy storage converter, includes:

[0038] Multiple sets are obtained based on the overall topology, where each set includes each second energy storage converter and any number of loads connected to it.

[0039] Obtain the overall power of each set in operation;

[0040] Iterate through all sets and determine whether each set has redundant space based on the total power requirement and the overall power.

[0041] If at least one set has redundant space, determine whether connecting the set with redundant space to the target load exceeds the preset requirements;

[0042] The set of objects whose access to the target load does not exceed the preset requirement and have redundant space is taken as the target set, and it is determined whether the target set is at least two.

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

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

[0045] The operating status of each second energy storage converter is monitored in real time, and the abnormality of the second energy storage converter is determined based on the operating status.

[0046] If the second energy storage converter malfunctions, obtain the operating power of the load connected to the second energy storage converter;

[0047] Determine if the load is faulty based on its operating power;

[0048] If a load is faulty, generate the corresponding fault information for the load.

[0049] Preferably, after the step of generating fault information corresponding to the load, the following steps are included:

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

[0051] The protection operation parameters of the second energy storage converter corresponding to the load are obtained 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 in order to protect the second energy storage converter and the load connected to the second energy storage converter.

[0053] This invention also provides a distributed energy storage off-grid operation control system based on multi-machine parallel connection, comprising:

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

[0055] The module is used to construct an overall topology based on multiple first energy storage converters and any number of loads connected to each first energy storage converter, and to determine the control parameters of the mathematical model corresponding to the multiple first energy storage converters based on the overall topology.

[0056] The control module is used to perform parameter control on the first energy storage converter according to the control parameters, and to define the first energy storage converter after parameter control as the second energy storage converter.

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

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

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

[0060] Preferably, the first acquisition module includes:

[0061] The first acquisition unit is used to acquire the 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] The second acquisition unit is used to acquire the current operating parameters of each first energy storage converter, wherein the current operating parameters include the current output current, the current output voltage, and the current output power;

[0063] The first building unit is used to vectorize the historical running parameters to obtain multiple first vectors, and to construct a historical parameter matrix based on the first vectors;

[0064] The second building unit is used to vectorize the current running parameters to obtain multiple second vectors, and to construct the current parameter matrix based on the second vectors;

[0065] The comparison unit is used to compare the historical parameter matrix and the current parameter matrix to obtain the comparison matrix;

[0066] Model units are constructed to determine model construction parameters based on the comparison matrix, and to determine the mathematical model of each first energy storage converter based on the model construction parameters.

[0067] The beneficial effects of this invention are as follows:

[0068] By acquiring the operating parameters of each energy storage converter in the distributed off-grid energy storage system, constructing different mathematical models based on their operating characteristics, and combining multiple energy storage converters and connected load structures to build an overall topology, the control parameters of the mathematical model corresponding to each energy storage converter are optimized. Based on these control parameters, parameter control is applied to the energy storage converters, ensuring efficient parallel operation of multiple energy storage converters. Furthermore, a load sharing strategy is introduced to acquire real-time load information for each energy storage converter, providing a global understanding of the power requirements of each load under different application scenarios. Power allocation can be dynamically adjusted based on load requirements and the operating status of the energy storage converters, ensuring stable operation of the distributed off-grid energy storage system under various working conditions, avoiding uneven power distribution, and improving the reliability of parallel off-grid operation. Attached Figure Description

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

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

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

[0072] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

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

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

[0075] S2. Construct an overall topology based on multiple first energy storage converters and any number of 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 based on the overall topology.

[0076] S3. Perform parameter control on the first energy storage converter according to the control parameters, and define the first energy storage converter after parameter control as the second energy storage converter.

[0077] S4. Obtain multiple load information connected to multiple second energy storage converters based on the overall topology;

[0078] S5. Obtain the load power requirement corresponding to each load information and the operating status of the corresponding second energy storage converter;

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

[0080] As described in steps S1-S6 above, 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 and perform AC-DC conversion. It can directly supply power to AC loads when there is no power grid. It is equipped with a controller. The controller can receive background control commands through communication and control the charging or discharging of the battery according to the power command and the power level 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, and energy storage converter specifications. Considering the variability of application scenarios, the model, task, and connected load of the energy storage converter in the distributed off-grid energy storage system will also form different distributed connection structures according to the application scenario. Therefore, in order to maximize the efficiency of each energy storage converter, this invention constructs different mathematical models based on the operating characteristics of each energy storage converter, and combines multiple energy storage converters and connected load structures to construct an overall topology. Each mathematical model will refer to the overall topology when performing parameter control.

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

[0083] Considering the overall characteristics and the features of each energy storage converter, the control parameters of the mathematical model corresponding to each energy storage converter are optimized, and parameter control of the energy storage converter is performed based on the control parameters. This ensures that multiple energy storage converters can operate in parallel efficiently. Furthermore, a load sharing strategy is introduced to obtain the load information corresponding to each energy storage converter in real time. This allows for a global understanding of the power demand of each load under different application scenarios. Based on the load demand and the operating status of the energy storage converter, the power distribution can be dynamically adjusted. This ensures that the distributed off-grid energy storage system can operate stably under various working conditions, avoids uneven power distribution, and improves the reliability of parallel off-grid operation.

[0084] In one embodiment, step S1, which involves obtaining the operating parameters of the first energy storage converter in a plurality of distributed off-grid energy storage systems and constructing a mathematical model for each first energy storage converter based on the operating parameters, includes:

[0085] S11. Obtain the 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. Obtain the current operating parameters of each first energy storage converter, wherein the current operating parameters include the current output current, the current output voltage, and the current output power;

[0087] S13. Vectorize the historical operating parameters to obtain multiple first vectors, and construct the historical parameter matrix based on the first vectors;

[0088] S14. Vectorize the current running parameters to obtain multiple second vectors, and construct the current parameter matrix based on the second vectors;

[0089] S15. Compare the historical parameter matrix and the current parameter matrix to obtain the comparison matrix;

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

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

[0092] In one embodiment, step S2, which involves constructing an overall topology based on a plurality of first energy storage converters and any number of loads connected to each first energy storage converter, and determining the control parameters of the mathematical model corresponding to the plurality of first energy storage converters based on the overall topology, includes:

[0093] S21. Obtain the connection relationship of multiple first energy storage converters, and use the multiple first energy storage converters as first nodes according to the connection relationship;

[0094] S22. Obtain the load information connected to multiple first energy storage converters, and use the load information as the second node connected to the first node;

[0095] S23. Construct the overall topology based on the connection relationships, the first node, and the second node;

[0096] S24. Obtain the number of second nodes corresponding to each first node and the specification information of each second node based on the overall topology;

[0097] S25. Obtain the mapping relationship table of the first energy storage converter-load, and obtain the number of second nodes and the weight corresponding to the specification information of the second nodes according to the mapping relationship table;

[0098] S26. Obtain the total number of first nodes based on the overall topology;

[0099] S27. Determine the proportion of each first node in the overall topology based on the total number of first nodes, the number of second nodes corresponding to each first node, and the weight.

[0100] S28. Obtain the overall operating requirements, and determine the control parameters of the mathematical model corresponding to each first node based on the overall operating requirements and the proportion of each first node in the overall topology.

[0101] As described in steps S21-S28 above, in the prior art, load information between energy storage converters cannot be shared. Typically, each energy storage converter is responsible for the load in its own area, making unified management of all loads impossible. This results in uneven power distribution among the 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, once the mathematical model is determined, the connection relationships between multiple energy storage converters and the load information connected to each energy storage converter can be obtained. Thus, based on the connection relationships and node information, a complete system can be constructed. Based on the overall topology and the mapping table of energy storage converters and loads, we can understand the proportion of different energy storage converters in the entire topology. Specifically, the more loads connected, the higher the proportion of the corresponding energy storage converter, or the higher the weight of the load specification information, the higher the proportion. Alternatively, we can combine the quantity and weight to determine the proportion. This can be adjusted according to the requirements and is not a unique limitation. Then, based on the overall operation requirements of the distributed energy storage off-grid system, we generate different control parameters for the mathematical model corresponding to different proportions, thereby optimizing the control parameters and improving the stability of multiple energy storage converters operating in parallel.

[0102] In addition, it also includes real-time monitoring of the connection relationship of multiple first energy storage converters, changes in the number of first nodes, and changes in the number of second nodes, and updating the overall topology based on the connection relationship, changes in the number of first nodes, and changes in the number of second nodes.

[0103] In one embodiment, step S6, which dynamically adjusts the power of multiple second energy storage converters based on load power demand and the operating status of the second energy storage converters, includes:

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

[0105] S62. Based on the overall topology and the load power requirements corresponding to each second energy storage converter, obtain the power ratio of each second energy storage converter in the distributed energy storage off-grid system.

[0106] S63. Allocate corresponding power to multiple second energy storage converters according to the total power requirements and power ratio.

[0107] As described in steps S61-S63 above, since the distributed energy storage off-grid system needs to be applied to different scenarios, the total power corresponding to different scenarios is different. Therefore, the power allocated to each energy storage converter and the corresponding load will also change. Thus, the power demand of each load and the current operating status of the energy storage converter can be obtained. Based on the current operating status, load power demand and power ratio, the corresponding power is allocated to each second energy storage converter to meet the 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 step S63 of allocating corresponding power to multiple second energy storage converters according to total power requirements and power percentages, the following steps are included:

[0109] S64. Obtain the operating status of each second energy storage converter;

[0110] S65. Determine the real-time power of the connected loads based on the operating status of the second energy storage converter, wherein the number of connected loads is arbitrary;

[0111] S66. Determine whether to disconnect the load corresponding to the real-time power based on the real-time power of the connected load and the operating status 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 taken as the target load, the corresponding second energy storage converter is taken as the first target energy storage converter, and according to the overall topology, the second energy storage converter that meets the target load access conditions and is adjacent to the first target energy storage converter is obtained, and the adjacent second energy storage converter is taken as the second target energy storage converter.

[0113] S68. Connect the target load to the second target energy storage converter, and dynamically adjust 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 steps S64-S68 above, after power allocation is completed, the energy storage converter can be monitored to ensure its stable operation. Specifically, the operating status of the energy storage converter and the real-time power of the load can be monitored, and it can be determined whether it is necessary to disconnect from the load based on the operating status and real-time power. Specifically, it can be determined based on whether the operating status is abnormal and whether the real-time power exceeds the range. If disconnection is required, in order to ensure overall operation stability, the operating status and load of adjacent energy storage converters can be obtained, and it can be determined whether the adjacent energy storage converters meet the access conditions. If they do, the load can be connected to the target energy storage converter. 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 converter is regenerated to achieve dynamic power adjustment.

[0115] In one embodiment, step S67, which involves obtaining a second energy storage converter adjacent to the first target energy storage converter that meets the target load access conditions based on the overall topology, and designating the adjacent second energy storage converter as the second target energy storage converter, includes:

[0116] S671. Obtain multiple sets based on the overall topology, wherein each set includes each second energy storage converter and any number of loads connected to it.

[0117] S672. Obtain the overall power of each set in operation;

[0118] S673. Traverse all sets and determine whether each set has redundant space based on the total power requirement and the overall power.

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

[0120] S675. Take the set of redundant space that does not exceed the preset requirement when accessing the target load as the target set, and determine whether the target set is at least two;

[0121] S676. If the target set is at least two, then the second energy storage converter corresponding to the target set closest to the second target energy storage converter is selected as the second target energy storage converter according to the overall topology.

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

[0123] In one embodiment, after step S68 of dynamically adjusting the power of multiple second energy storage converters according to 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 based on the operating status;

[0125] S682. If the second energy storage converter malfunctions, obtain the operating power of the load connected to the second energy storage converter.

[0126] S683. Determine if the load is faulty based on its operating power;

[0127] S684. If the load has a fault, generate the corresponding fault information for the load.

[0128] As described in steps S681-S684 above, in order to improve overall stability, the present invention monitors the operating status of the energy storage converter in real time to detect faults. 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 fault source can be quickly identified.

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

[0130] S6841. Obtain the protection mechanism corresponding to the load based on the fault information;

[0131] S6842. Obtain the 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 in order to protect the second energy storage converter and the load connected to the second energy storage converter.

[0133] As described in steps S6841-S6843 above, in order to improve overall safety, a corresponding protection mechanism can be generated based on the fault information, and protection operation parameters can be obtained based on the protection mechanism. Then, the control parameters can be adjusted in real time based on the protection operation parameters to prevent the energy storage converter and load from spreading due to the fault information.

[0134] This invention also provides a distributed energy storage off-grid operation control system based on multi-machine parallel connection, comprising:

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

[0136] Module 2 is used to construct an overall topology based on multiple first energy storage converters and any number of loads connected to each first energy storage converter, and to determine the control parameters of the mathematical model corresponding to the multiple first energy storage converters based on the overall topology.

[0137] Control module 3 is used to perform parameter control on the first energy storage converter according to the control parameters, and to define the first energy storage converter after parameter control as the second energy storage converter.

[0138] The second acquisition module 4 is used to acquire multiple load information connected to multiple second energy storage converters according to the overall topology;

[0139] The third acquisition module 5 is used to acquire the load power requirement corresponding to each load information and the operating status of the corresponding second energy storage converter;

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

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

[0142] The first acquisition unit is used to acquire the 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] The second acquisition unit is used to acquire the current operating parameters of each first energy storage converter, wherein the current operating parameters include the current output current, the current output voltage, and the current output power;

[0144] The first building unit is used to vectorize the historical running parameters to obtain multiple first vectors, and to construct a historical parameter matrix based on the first vectors;

[0145] The second building unit is used to vectorize the current running parameters to obtain multiple second vectors, and to construct the current parameter matrix based on the second vectors;

[0146] The comparison unit is used to compare the historical parameter matrix and the current parameter matrix to obtain the comparison matrix;

[0147] Model units are constructed to determine model construction parameters based on the comparison matrix, and to determine the mathematical model of each first energy storage converter based on the model construction parameters.

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

[0149] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the present invention and 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. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual-rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0150] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, apparatus, article, or method that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, apparatus, article, or method. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, apparatus, article, or method that includes that element.

[0151] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within 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: Obtain the operating parameters of multiple first energy storage converters in the distributed off-grid energy storage system, and construct a mathematical model for each first energy storage converter based on the operating parameters; The overall topology is constructed based on multiple first energy storage converters and any number of loads connected to each first energy storage converter, and the control parameters of the mathematical model corresponding to the multiple first energy storage converters are determined based on the overall topology. The first energy storage converter is parameter controlled according to the control parameters, and the first energy storage converter after parameter control is defined as the second energy storage converter. Based on the overall topology, obtain information on multiple loads connected to multiple second energy storage converters; Obtain the load power requirement corresponding to each load information and the operating status of the corresponding second energy storage converter; Dynamically adjust the power of multiple second energy storage converters according to the load power demand and the operating status of the second energy storage converter; The steps of constructing an overall topology based on multiple first energy storage converters and any number of loads connected to each first energy storage converter, and determining the control parameters of the mathematical model corresponding to the multiple first energy storage converters based on the overall topology, include: Obtain the connection relationship of multiple first energy storage converters, and use the multiple first energy storage converters as first nodes according to the connection relationship; Obtain the load information connected to multiple first energy storage converters, and use the load information as the second node connected to the first node; Construct the overall topology based on the connection relationships, the first node, and the second node; Based on the overall topology, obtain the number of second nodes corresponding to each first node and the specification information of each second node; Obtain the mapping relationship table of the first energy storage converter-load, and obtain the weights corresponding to the number of second nodes and the specification information of the second nodes based on the mapping relationship table; The total number of the first node is obtained based on the overall topology; The proportion of each first node in the overall topology is determined based on the total number of first nodes, the number of second nodes corresponding to each first node, and their weights. Obtain the overall operating requirements, and determine the control parameters of the mathematical model corresponding to each first node based on the overall operating requirements and the proportion of each first node in the overall topology.

2. The off-grid operation control method for distributed energy storage based on multi-machine parallel connection according to claim 1, characterized in that, The steps of obtaining the operating parameters of the first energy storage converter in multiple distributed off-grid energy storage systems and constructing a mathematical model for each first energy storage converter based on the operating parameters include: Obtain the historical operating parameters of each first energy storage converter within a preset time period, including historical output current, historical output voltage, and historical output power. Obtain the current operating parameters of each first energy storage converter, including the current output current, current output voltage, and current output power; The historical operating parameters are vectorized to obtain multiple first vectors, and a historical parameter matrix is ​​constructed based on the first vectors. The current running parameters are vectorized to obtain multiple second vectors, and the current parameter matrix is ​​constructed based on the second vectors. The historical parameter matrix and the current parameter matrix are compared to obtain a comparison matrix; The model construction parameters are determined based on the comparison matrix, and the mathematical model of each first energy storage converter is determined based on the model construction parameters.

3. The off-grid operation control method for distributed energy storage based on multi-machine parallel connection according to claim 1, characterized in that, The step of dynamically adjusting the power of multiple second energy storage converters according to the load power demand and the operating status of the second energy storage converters includes: Obtain the total power requirements of the distributed energy storage off-grid system; Based on the overall topology and the load power requirements corresponding to each second energy storage converter, the power ratio of each second energy storage converter in the distributed energy storage off-grid system is obtained. The power is allocated to the multiple second energy storage converters according to the total power requirement and power ratio.

4. The off-grid operation control method for distributed energy storage based on multi-machine parallel connection according to claim 3, characterized in that, Following the step of allocating corresponding power to multiple second energy storage converters based on total power requirements and power proportions, the following steps are included: Obtain the operating status of each second energy storage converter; The real-time power of the connected loads is determined based on the operating status of the second energy storage converter, wherein the number of connected loads is arbitrary; Determine whether to disconnect the load corresponding to the real-time power based on the real-time power of the connected load and the operating status 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 taken as the target load, the corresponding second energy storage converter is taken as the first target energy storage converter, and according to the overall topology, the second energy storage converter that meets the target load access conditions and is adjacent to the first target energy storage converter is obtained, and the adjacent second energy storage converter is taken as the second target energy storage converter. The target load is connected to the 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.

5. The off-grid operation control method for distributed energy storage based on multi-machine parallel connection according to claim 4, characterized in that, The step of obtaining a second energy storage converter adjacent to the first target energy storage converter that meets the target load access conditions based on the overall topology, and using the adjacent second energy storage converter as the second target energy storage converter, includes: Multiple sets are obtained based on the overall topology, where each set includes each second energy storage converter and any number of loads connected to it. Obtain the overall power of each set in operation; Iterate through all sets and determine whether each set has redundant space based on the total power requirement and the overall power. If at least one set has redundant space, determine whether connecting the set with redundant space to the target load exceeds the preset requirements; The set of objects with redundant space whose access to the target load does not exceed the preset requirements is taken as the target set, and it is determined whether the target set is at least two. If the target set is at least two, then the second energy storage converter corresponding to the target set closest to the second target energy storage converter is selected as the second target energy storage converter according to the overall topology.

6. The off-grid operation control method for distributed energy storage based on multi-machine parallel connection according to claim 1, characterized in that, Following the step of dynamically adjusting the power of multiple second energy storage converters based on load power demand and the operating status of the second energy storage converters, the method further includes: The operating status of each second energy storage converter is monitored in real time, and the abnormality of the second energy storage converter is determined based on the operating status. If the second energy storage converter malfunctions, obtain the operating power of the load connected to the second energy storage converter; Determine if the load is faulty based on its operating power; If a load is faulty, generate the corresponding fault information for the load.

7. The off-grid operation control method for distributed energy storage based on multi-machine parallel connection according to claim 6, characterized in that, After generating the fault information corresponding to the load, the following steps are included: Obtain the protection mechanism corresponding to the load based on the fault information; The protection operation parameters of the second energy storage converter corresponding to the load are obtained 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 in order to protect the second energy storage converter and the load connected to the second energy storage converter.

8. A distributed energy storage off-grid operation control system based on multi-machine parallel connection, characterized in that, include: The first acquisition module is used to acquire the operating parameters of multiple first energy storage converters in the distributed off-grid energy storage system, and to construct a mathematical model for each first energy storage converter based on the operating parameters. The module is used to construct an overall topology based on multiple first energy storage converters and any number of loads connected to each first energy storage converter, and to determine the control parameters of the mathematical model corresponding to the multiple first energy storage converters based on the overall topology. The control module is used to perform parameter control on the first energy storage converter according to the control parameters, and to define the first energy storage converter after parameter control as the second energy storage converter. The second acquisition module is used to acquire multiple load information connected to multiple second energy storage converters according to the overall topology. The third acquisition module is used to acquire the load power requirement corresponding to each load information and the operating status of the corresponding second energy storage converter; The adjustment module is used to dynamically adjust the power of multiple second energy storage converters according to the load power demand and the operating status of the second energy storage converter. The steps of constructing an overall topology based on multiple first energy storage converters and any number of loads connected to each first energy storage converter, and determining the control parameters of the mathematical model corresponding to the multiple first energy storage converters based on the overall topology, include: Obtain the connection relationship of multiple first energy storage converters, and use the multiple first energy storage converters as first nodes according to the connection relationship; Obtain the load information connected to multiple first energy storage converters, and use the load information as the second node connected to the first node; Construct the overall topology based on the connection relationships, the first node, and the second node; Based on the overall topology, obtain the number of second nodes corresponding to each first node and the specification information of each second node; Obtain the mapping relationship table of the first energy storage converter-load, and obtain the weights corresponding to the number of second nodes and the specification information of the second nodes based on the mapping relationship table; The total number of the first node is obtained based on the overall topology; The proportion of each first node in the overall topology is determined based on the total number of first nodes, the number of second nodes corresponding to each first node, and their weights. Obtain the overall operating requirements, and determine the control parameters of the mathematical model corresponding to each first node based on the overall operating requirements and the proportion of each first node in the overall topology.

9. The off-grid operation control system for distributed energy storage based on multi-machine parallel connection according to claim 8, characterized in that, The first acquisition module includes: The first acquisition unit is used to acquire the 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. The second acquisition unit is used to acquire the current operating parameters of each first energy storage converter, wherein the current operating parameters include the current output current, the current output voltage, and the current output power; The first building unit is used to vectorize the historical running parameters to obtain multiple first vectors, and to construct a historical parameter matrix based on the first vectors; The second building unit is used to vectorize the current running parameters to obtain multiple second vectors, and to construct the current parameter matrix based on the second vectors; The comparison unit is used to compare the historical parameter matrix and the current parameter matrix to obtain the comparison matrix; Model units are constructed to determine model construction parameters based on the comparison matrix, and to determine the mathematical model of each first energy storage converter based on the model construction parameters.

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