A control method and system for coordinated charging and discharging of multiple battery packs in a microgrid

Abstract

The present application provides a control method and system for coordinated charging and discharging of multiple battery packs in a microgrid. The method includes: obtaining charging and discharging data of the battery pack from a battery management system, obtaining a battery health status evaluation index based on the charging and discharging data processing, determining a target battery pack based on the battery health status evaluation index, obtaining SOC data and power threshold setting data of the target battery pack, selecting a charging and discharging mode based on the SOC data and power threshold setting data, and evaluating the collaborative working capabilities of different target battery packs; thereby achieving the purpose of coordinated charging and discharging control of multiple battery packs.

Description

Technical Field

[0001] The present application relates to the field of big data and charging and discharging control technology, and more specifically, to a control method and system for coordinated charging and discharging of multiple battery packs in a microgrid. Background Art

[0002] In existing power systems, the coordinated charging and discharging control of multiple battery packs often has problems such as low efficiency, poor flexibility, and difficulty in meeting complex load requirements. Especially in scenarios involving both grid-connected charging and off-grid power supply, how to achieve efficient, stable and flexible energy management is a technical problem that needs to be solved urgently. Summary of the invention

[0003] The purpose of the present application is to provide a control method and system for the coordinated charging and discharging of multiple battery packs in a microgrid, obtain the charging and discharging data of the battery pack from a battery management system, obtain a battery health status evaluation index based on the charging and discharging data processing, determine the target battery pack based on the battery health status evaluation index, obtain the SOC data and power threshold setting data of the target battery pack, select the charging and discharging mode based on the SOC data and the power threshold setting data, and evaluate the collaborative working ability of different target battery packs, so as to achieve the purpose of coordinated charging and discharging control of multiple battery packs.

[0004] The present application also provides a control method for coordinated charging and discharging of multiple battery packs in a microgrid, comprising the following steps:

[0005] Acquire the charge and discharge data of the battery pack from the battery management system, obtain the battery health status evaluation index according to the charge and discharge data processing, and determine the target battery pack according to the battery health status evaluation index;

[0006] Acquire SOC data and power threshold setting data of the target battery pack, the power threshold setting data including a battery power too low setting value, a battery power low setting value, and a battery power high setting value;

[0007] Comparing the SOC data with the low battery setting value, if the SOC data is less than or equal to the low battery setting value, switching the target battery pack to a separate charging mode;

[0008] If the SOC data is greater than or equal to the high battery power setting value, the target battery pack switches to a separate discharge mode;

[0009] If the SOC data is less than the low battery setting value and greater than the too low battery setting value, the target battery pack switches to a hybrid charge and discharge mode;

[0010] If the SOC data is greater than or equal to a low battery setting value and less than a high battery setting value, the target battery pack maintains the current state.

[0011] Optionally, in the control method for coordinated charging and discharging of multiple battery packs in a microgrid described in the present application, acquiring charging and discharging data of the battery pack from the battery management system, obtaining a battery health status evaluation index according to the charging and discharging data processing, and determining a target battery pack according to the battery health status evaluation index include:

[0012] Obtain the charge and discharge data of the battery pack from the battery management system, including voltage data, current data, temperature data, internal resistance data, charge and discharge cycle data, self-discharge rate data and capacity decay rate data;

[0013] Inputting the voltage data, current data, temperature data, internal resistance data, charge and discharge cycle data, self-discharge rate data and capacity decay rate data into a preset battery health status assessment model for processing to obtain a battery health status assessment index;

[0014] The battery health status evaluation index is compared with a preset battery health status evaluation index threshold, and the battery group whose threshold comparison result meets the preset comparison result requirement is taken as the target battery group, and all target battery groups form a target battery cluster.

[0015] Optionally, in the control method for coordinated charging and discharging of multiple battery packs in a microgrid described in the present application, the SOC data is compared with the low battery setting value, and if the SOC data is less than or equal to the low battery setting value, the target battery pack switches to a separate charging mode, including:

[0016] If the SOC data of the target battery group is less than the low battery setting value, the grid-connected PCS group corresponding to the target battery group is turned on, and the off-grid PCS group corresponding to the target battery group is turned off;

[0017] Obtain the maximum output power of the diesel engine, and process the maximum output power of the diesel engine and the SOC data to obtain the initial conversion power of the grid-connected PCS group;

[0018] Obtain the maximum charging power of the grid-connected PCS group and the maximum charging power of the battery cluster, compare the maximum charging power of the grid-connected PCS group and the maximum charging power of the battery cluster, and select the charging power with the smaller value as the charging power to be compared;

[0019] If the initial conversion power of the grid-connected PCS group is greater than the charging power to be compared, the charging power to be compared is used as the conversion power of the grid-connected PCS group;

[0020] If the initial conversion power of the grid-connected PCS group is less than or equal to the charging power to be compared, the initial conversion power of the grid-connected PCS group is used as the conversion power of the grid-connected PCS group;

[0021] The conversion power of each grid-connected PCS converter is calculated according to the conversion power of the grid-connected PCS group, and the grid-connected PCS converter charges the target battery group according to the conversion power.

[0022] Optionally, in the control method for coordinated charging and discharging of multiple battery packs in a microgrid described in the present application, if the SOC data is greater than or equal to a high battery power setting value, the target battery pack switches to a separate discharge mode, including:

[0023] If the SOC data of the target battery group is greater than the high battery power setting value, the off-grid PCS group corresponding to the target battery group is turned on, and the grid-connected PCS group corresponding to the target battery group is turned off;

[0024] Obtain the off-grid PCS group power and the maximum discharge power of the battery group corresponding to the target battery group. If the off-grid PCS group power is greater than the maximum discharge power of the battery group, the off-grid PCS group corresponding to the target battery group is shut down.

[0025] If the off-grid PCS group power is less than or equal to the maximum discharge power of the battery group, the discharge power of each off-grid PCS converter is calculated according to the off-grid PCS group power;

[0026] The off-grid PCS converter discharges the target battery pack according to the discharge power.

[0027] Optionally, in the control method for coordinated charging and discharging of multiple battery packs in a microgrid described in the present application, if the SOC data is less than a low battery setting value and greater than a too low battery setting value, the target battery pack switches to a hybrid charging and discharging mode, including:

[0028] If the SOC data of the target battery group is less than the low battery setting value and greater than the too low battery setting value, the grid-connected PCS group and the off-grid PCS group corresponding to the target battery group are both turned on;

[0029] The grid-connected PCS converter charges the target battery pack according to the conversion power, and the off-grid PCS converter discharges the target battery pack according to the discharge power.

[0030] Optionally, the control method for coordinated charging and discharging of multiple battery packs in a microgrid described in the present application further includes:

[0031] Acquiring charge and discharge efficiency data, battery pack response time data, capacity attenuation rate data, internal resistance change rate data, and terminal voltage change rate data of the target battery pack;

[0032] Processing the capacity attenuation rate data, the internal resistance change rate data, and the terminal voltage change rate data to obtain a battery pack life attenuation assessment factor;

[0033] Calculate a battery pack performance evaluation index according to the charge and discharge efficiency data, the battery pack response time data, and the battery pack life attenuation evaluation factor;

[0034] The performance evaluation standard deviation data is obtained by calculating the battery pack performance evaluation index of all target battery packs in the target battery cluster.

[0035] Optionally, the control method for coordinated charging and discharging of multiple battery packs in a microgrid described in the present application further includes:

[0036] Acquiring overall charge and discharge efficiency data and coordinated response time data of the target battery cluster;

[0037] Calculate according to the charge and discharge efficiency data, the battery pack response time data, the overall charge and discharge efficiency data and the coordinated response time data to obtain coordinated charge and discharge deviation data;

[0038] Calculate according to the performance evaluation standard deviation data and the collaborative charge and discharge deviation data to obtain a battery pack collaborative evaluation index;

[0039] The battery group collaborative evaluation index is compared with a preset battery group collaborative evaluation index threshold, and if the threshold comparison result does not meet the preset threshold comparison result requirement, a battery group collaborative abnormality determination is performed.

[0040] In a second aspect, the present application provides a control system for coordinated charging and discharging of multiple battery packs in a microgrid, the system comprising: a memory and a processor, wherein the memory stores a program of a control method for coordinated charging and discharging of multiple battery packs in a microgrid, and when the program of the control method for coordinated charging and discharging of multiple battery packs in a microgrid is executed by the processor, the following steps are implemented:

[0041] Acquire the charge and discharge data of the battery pack from the battery management system, obtain the battery health status evaluation index according to the charge and discharge data processing, and determine the target battery pack according to the battery health status evaluation index;

[0042] Acquire SOC data and power threshold setting data of the target battery pack, the power threshold setting data including a battery power too low setting value, a battery power low setting value, and a battery power high setting value;

[0043] Comparing the SOC data with the low battery setting value, if the SOC data is less than or equal to the low battery setting value, switching the target battery pack to a separate charging mode;

[0044] If the SOC data is greater than or equal to the high battery power setting value, the target battery pack switches to a separate discharge mode;

[0045] If the SOC data is less than the low battery setting value and greater than the too low battery setting value, the target battery pack switches to a hybrid charge and discharge mode;

[0046] If the SOC data is greater than or equal to a low battery setting value and less than a high battery setting value, the target battery pack maintains the current state.

[0047] Optionally, in the control system for coordinated charging and discharging of multiple battery packs in a microgrid described in the present application, acquiring charging and discharging data of the battery pack from the battery management system, obtaining a battery health status evaluation index according to the charging and discharging data processing, and determining a target battery pack according to the battery health status evaluation index include:

[0048] Obtain the charge and discharge data of the battery pack from the battery management system, including voltage data, current data, temperature data, internal resistance data, charge and discharge cycle data, self-discharge rate data and capacity decay rate data;

[0049] Inputting the voltage data, current data, temperature data, internal resistance data, charge and discharge cycle data, self-discharge rate data and capacity decay rate data into a preset battery health status assessment model for processing to obtain a battery health status assessment index;

[0050] The battery health status evaluation index is compared with a preset battery health status evaluation index threshold, and the battery group whose threshold comparison result meets the preset comparison result requirement is taken as the target battery group, and all target battery groups form a target battery cluster.

[0051] From the above, it can be seen that the present application provides a control method and system for the coordinated charging and discharging of multiple battery packs in a microgrid, which obtains the charging and discharging data of the battery pack from the battery management system, obtains the battery health status evaluation index based on the charging and discharging data processing, determines the target battery pack based on the battery health status evaluation index, obtains the SOC data and power threshold setting data of the target battery pack, selects the charging and discharging mode based on the SOC data and the power threshold setting data, and evaluates the collaborative working ability of different target battery packs, thereby achieving the purpose of coordinated charging and discharging control of multiple battery packs.

[0052] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the embodiments of the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0054] Figure 1 A flow chart of a control method for coordinated charging and discharging of multiple battery packs in a microgrid provided in an embodiment of the present application;

[0055] Figure 2 A flow chart of determining a target battery group in a control method for coordinated charging and discharging of multiple battery groups in a microgrid provided in an embodiment of the present application;

[0056] Figure 3 A flow chart of switching a target battery group to a separate charging mode in a control method for coordinated charging and discharging of multiple battery groups in a microgrid provided in an embodiment of the present application;

[0057] Figure 4 A flow chart of switching a target battery group to a separate discharge mode in a control method for coordinated charging and discharging of multiple battery groups in a microgrid provided in an embodiment of the present application. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0059] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0060] Please refer to Figure 1 , Figure 1The flowchart of a control method for coordinated charging and discharging of multiple battery packs in a microgrid in some embodiments of the present application. The control method for coordinated charging and discharging of multiple battery packs in a microgrid is used in a terminal device, such as a computer, a mobile phone terminal, etc. The control method for coordinated charging and discharging of multiple battery packs in a microgrid includes the following steps:

[0061] S11, acquiring charging and discharging data of a battery pack from a battery management system, obtaining a battery health status evaluation index according to the charging and discharging data, and determining a target battery pack according to the battery health status evaluation index;

[0062] S12, obtaining SOC data and power threshold setting data of the target battery pack, where the power threshold setting data includes a battery power too low setting value, a battery power low setting value, and a battery power high setting value;

[0063] S13, comparing the SOC data with the low battery setting value, if the SOC data is less than or equal to the low battery setting value, switching the target battery pack to a separate charging mode;

[0064] S14, if the SOC data is greater than or equal to the high battery power setting value, the target battery pack switches to a separate discharge mode;

[0065] S15, if the SOC data is less than the low battery setting value and greater than the too low battery setting value, the target battery pack switches to a hybrid charge and discharge mode;

[0066] S16: If the SOC data is greater than or equal to a low battery setting value and less than a high battery setting value, the target battery pack maintains the current state.

[0067] It should be noted that the charge and discharge data of the battery pack is obtained from the battery management system, the battery health status assessment index is obtained according to the charge and discharge data processing, the target battery pack is determined according to the battery health status assessment index, the SOC data and power threshold setting data of the target battery pack are obtained, the charge and discharge mode is selected according to the SOC data and the power threshold setting data, and the collaborative working ability of different target battery packs is evaluated, so as to achieve the purpose of collaborative charge and discharge control of multiple battery packs.

[0068] Please refer to Figure 2 , Figure 2 The present invention is a flowchart of determining a target battery group in a control method for coordinated charging and discharging of multiple battery groups in a microgrid in some embodiments of the present application. According to an embodiment of the present invention, obtaining charging and discharging data of a battery group from a battery management system, obtaining a battery health status evaluation index based on the charging and discharging data processing, and determining a target battery group based on the battery health status evaluation index include:

[0069] S21, obtaining the charge and discharge data of the battery pack from the battery management system, including voltage data, current data, temperature data, internal resistance data, charge and discharge cycle data, self-discharge rate data and capacity decay rate data;

[0070] S22, inputting the voltage data, current data, temperature data, internal resistance data, charge and discharge cycle data, self-discharge rate data and capacity decay rate data into a preset battery health status assessment model for processing to obtain a battery health status assessment index;

[0071] S23, comparing the battery health status evaluation index with a preset battery health status evaluation index threshold, taking the battery group whose threshold comparison result meets the preset comparison result requirement as the target battery group, and all the target battery groups constitute a target battery cluster.

[0072] It should be noted that whether to charge or discharge is determined by evaluating the health status of the battery pack. In this embodiment, if the threshold comparison result does not meet the preset comparison result requirements, it means that the battery pack is faulty and will not be charged or discharged. The preset battery health status evaluation model is a model obtained by training a large number of historical samples of voltage data, current data, temperature data, internal resistance data, charge and discharge cycle data, self-discharge rate data, capacity decay rate data and battery health status evaluation index. The corresponding output battery health status evaluation index can be obtained by processing the input relevant information.

[0073] Please refer to Figure 3 , Figure 3 The present invention is a flowchart of a method for controlling the coordinated charging and discharging of multiple battery packs in a microgrid, wherein the target battery pack switches to a separate charging mode. According to an embodiment of the present invention, the SOC data is compared with the low battery setting value, and if the SOC data is less than or equal to the low battery setting value, the target battery pack switches to a separate charging mode, including:

[0074] S31. If the SOC data of the target battery group is less than the low battery setting value, the grid-connected PCS group corresponding to the target battery group is turned on, and the off-grid PCS group corresponding to the target battery group is turned off;

[0075] S32, obtaining the maximum output power of the diesel engine, and performing processing according to the maximum output power of the diesel engine and the SOC data to obtain the initial conversion power of the grid-connected PCS group;

[0076] S33, obtaining the maximum charging power of the grid-connected PCS group and the maximum charging power of the battery cluster, comparing the maximum charging power of the grid-connected PCS group and the maximum charging power of the battery cluster, and selecting the charging power with a smaller value as the charging power to be compared;

[0077] S34. If the initial conversion power of the grid-connected PCS group is greater than the charging power to be compared, the charging power to be compared is used as the conversion power of the grid-connected PCS group;

[0078] S35. If the initial conversion power of the grid-connected PCS group is less than or equal to the charging power to be compared, the initial conversion power of the grid-connected PCS group is used as the conversion power of the grid-connected PCS group;

[0079] S36. Calculate the conversion power of each grid-connected PCS converter according to the conversion power of the grid-connected PCS group, and the grid-connected PCS converter charges the target battery group according to the conversion power.

[0080] It should be noted that SOC (State of Charge) indicates the remaining battery power. PCS (Power Conversion System) is one of the key devices in the energy storage system. Its main function is to realize the conversion and control of electric energy between different forms. If the remaining data of the target battery group is less than the low battery power setting value, the grid-connected PCS group corresponding to the target battery group is turned on and starts to enter the charging mode, and the off-grid PCS group is turned off. The grid-connected PCS group contains multiple PCS converters. The conversion power of the grid-connected PCS group is divided by the number of grid-connected PCS converters to obtain the conversion power of each grid-connected PCS converter.

[0081] The calculation formula of the initial conversion power of the grid-connected PCS group is:

[0082] ;

[0083] in, is the initial conversion power of the grid-connected PCS group, is the maximum output power of the diesel engine, is the SOC data of the i-th target battery pack, i=1,...,n, and n is the number of target battery packs.

[0084] Please refer to Figure 4 , Figure 4 The present invention is a flowchart of a method for controlling the coordinated charging and discharging of multiple battery packs in a microgrid in some embodiments of the present application, wherein the target battery pack switches to a separate discharge mode. According to an embodiment of the present invention, if the SOC data is greater than or equal to a high battery power setting value, the target battery pack switches to a separate discharge mode, including:

[0085] S41, if the SOC data of the target battery group is greater than the high battery power setting value, the off-grid PCS group corresponding to the target battery group is turned on, and the grid-connected PCS group corresponding to the target battery group is turned off;

[0086] S42, obtaining the off-grid PCS group power and the maximum discharge power of the battery group corresponding to the target battery group. If the off-grid PCS group power is greater than the maximum discharge power of the battery group, the off-grid PCS group corresponding to the target battery group is shut down;

[0087] S43, if the off-grid PCS group power is less than or equal to the maximum discharge power of the battery group, calculate the discharge power of each off-grid PCS converter according to the off-grid PCS group power;

[0088] S44: The off-grid PCS converter discharges the target battery pack according to the discharge power.

[0089] It should be noted that if the SOC data is greater than or equal to the high setting value of the battery power, the target battery group switches to a separate discharge mode, the off-grid PCS group corresponding to the target battery group is turned on, and the grid-connected PCS group is turned off. If the off-grid PCS group power is less than or equal to the maximum discharge power of the battery group, the off-grid PCS group power is divided by the number of off-grid PCS converters to obtain the discharge power of each off-grid PCS converter.

[0090] According to an embodiment of the present invention, if the SOC data is less than a low battery setting value and greater than a too low battery setting value, the target battery pack switches to a hybrid charge and discharge mode, including:

[0091] If the SOC data of the target battery group is less than the low battery setting value and greater than the too low battery setting value, the grid-connected PCS group and the off-grid PCS group corresponding to the target battery group are both turned on;

[0092] The grid-connected PCS converter charges the target battery pack according to the conversion power, and the off-grid PCS converter discharges the target battery pack according to the discharge power.

[0093] It should be noted that if the SOC data is less than the low battery setting value and greater than the too low battery setting value, the target battery group switches to the hybrid charge and discharge mode, and the grid-connected PCS group and the off-grid PCS group corresponding to the target battery group are both turned on.

[0094] According to an embodiment of the present invention, it also includes:

[0095] Acquiring charge and discharge efficiency data, battery pack response time data, capacity attenuation rate data, internal resistance change rate data, and terminal voltage change rate data of the target battery pack;

[0096] Processing the capacity attenuation rate data, the internal resistance change rate data, and the terminal voltage change rate data to obtain a battery pack life attenuation assessment factor;

[0097] Calculate a battery pack performance evaluation index according to the charge and discharge efficiency data, the battery pack response time data, and the battery pack life attenuation evaluation factor;

[0098] The performance evaluation standard deviation data is obtained by calculating the battery pack performance evaluation index of all target battery packs in the target battery cluster.

[0099] It should be noted that in order to evaluate the collaborative working ability of all target battery groups in the target battery cluster, the capacity attenuation rate data, the internal resistance change rate data and the terminal voltage change rate data are processed to obtain the battery group life attenuation evaluation factor, and the battery group performance evaluation index is calculated based on the charge and discharge efficiency data, the battery group response time data and the battery group life attenuation evaluation factor. The performance evaluation standard deviation data is obtained by calculating the battery group performance evaluation index of all target battery groups in the target battery cluster;

[0100] The calculation formula of the battery pack life attenuation assessment factor is:

[0101] ;

[0102] in, is the battery pack life attenuation assessment factor, is the capacity decay rate data, is the internal resistance change rate data, is the terminal voltage change rate data, , and is a preset characteristic coefficient (which can be obtained by querying the preset energy management system database);

[0103] The calculation formula of the battery pack performance evaluation index is:

[0104] ;

[0105] in, is the battery pack performance evaluation index, is the charge and discharge efficiency data, is the battery pack response time data, is the battery pack life attenuation assessment factor, is a preset characteristic coefficient (which can be obtained by querying the preset energy management system database);

[0106] The calculation formula of the performance evaluation standard deviation data is:

[0107] ;

[0108] in, is the standard deviation data for performance evaluation, is the battery pack performance evaluation index of the i-th battery pack, i=1,...,n, and n is the number of target battery packs.

[0109] According to an embodiment of the present invention, it also includes:

[0110] Acquiring overall charge and discharge efficiency data and coordinated response time data of the target battery cluster;

[0111] Calculate according to the charge and discharge efficiency data, the battery pack response time data, the overall charge and discharge efficiency data and the coordinated response time data to obtain coordinated charge and discharge deviation data;

[0112] Calculate according to the performance evaluation standard deviation data and the collaborative charge and discharge deviation data to obtain a battery pack collaborative evaluation index;

[0113] The battery group collaborative evaluation index is compared with a preset battery group collaborative evaluation index threshold, and if the threshold comparison result does not meet the preset threshold comparison result requirement, a battery group collaborative abnormality determination is performed.

[0114] It should be noted that the coordinated charge and discharge deviation data is obtained by calculating according to the charge and discharge efficiency data, the battery pack response time data, the overall charge and discharge efficiency data and the coordinated response time data;

[0115] The calculation formula of the coordinated charge and discharge deviation data is:

[0116] ;

[0117] in, For the coordinated charge and discharge deviation data, is the charge and discharge efficiency data, is the overall charge and discharge efficiency data, is the battery pack response time data, It is the collaborative response time data;

[0118] Calculate according to the performance evaluation standard deviation data and the collaborative charge and discharge deviation data to obtain a battery pack collaborative evaluation index;

[0119] The calculation formula of the battery pack synergy evaluation index is:

[0120] ;

[0121] in, is the battery pack synergy evaluation index, For the coordinated charge and discharge deviation data, is the standard deviation data for performance evaluation, is the preset characteristic coefficient (which can be obtained by querying the preset energy management system database).

[0122] The present invention also discloses a control system for coordinated charging and discharging of multiple battery packs in a microgrid, comprising a memory and a processor, wherein the memory stores a control method program for coordinated charging and discharging of multiple battery packs in a microgrid, and when the control method program for coordinated charging and discharging of multiple battery packs in a microgrid is executed by the processor, the following steps are implemented:

[0123] Acquire the charge and discharge data of the battery pack from the battery management system, obtain the battery health status evaluation index according to the charge and discharge data processing, and determine the target battery pack according to the battery health status evaluation index;

[0124] Acquire SOC data and power threshold setting data of the target battery pack, the power threshold setting data including a battery power too low setting value, a battery power low setting value, and a battery power high setting value;

[0125] Comparing the SOC data with the low battery setting value, if the SOC data is less than or equal to the low battery setting value, switching the target battery pack to a separate charging mode;

[0126] If the SOC data is greater than or equal to the high battery power setting value, the target battery pack switches to a separate discharge mode;

[0127] If the SOC data is less than the low battery setting value and greater than the too low battery setting value, the target battery pack switches to a hybrid charge and discharge mode;

[0128] If the SOC data is greater than or equal to a low battery setting value and less than a high battery setting value, the target battery pack maintains the current state.

[0129] It should be noted that the charge and discharge data of the battery pack is obtained from the battery management system, the battery health status assessment index is obtained according to the charge and discharge data processing, the target battery pack is determined according to the battery health status assessment index, the SOC data and power threshold setting data of the target battery pack are obtained, the charge and discharge mode is selected according to the SOC data and the power threshold setting data, and the collaborative working ability of different target battery packs is evaluated, so as to achieve the purpose of collaborative charge and discharge control of multiple battery packs.

[0130] According to an embodiment of the present invention, acquiring the charge and discharge data of a battery pack from a battery management system, obtaining a battery health status evaluation index according to the charge and discharge data processing, and determining a target battery pack according to the battery health status evaluation index include:

[0131] Obtain the charge and discharge data of the battery pack from the battery management system, including voltage data, current data, temperature data, internal resistance data, charge and discharge cycle data, self-discharge rate data and capacity decay rate data;

[0132] Inputting the voltage data, current data, temperature data, internal resistance data, charge and discharge cycle data, self-discharge rate data and capacity decay rate data into a preset battery health status assessment model for processing to obtain a battery health status assessment index;

[0133] The battery health status evaluation index is compared with a preset battery health status evaluation index threshold, and the battery group whose threshold comparison result meets the preset comparison result requirement is taken as the target battery group, and all target battery groups form a target battery cluster.

[0134] It should be noted that whether to charge or discharge is determined by evaluating the health status of the battery pack. In this embodiment, if the threshold comparison result does not meet the preset comparison result requirements, it means that the battery pack is faulty and will not be charged or discharged. The preset battery health status evaluation model is a model obtained by training a large number of historical samples of voltage data, current data, temperature data, internal resistance data, charge and discharge cycle data, self-discharge rate data, capacity decay rate data and battery health status evaluation index. The corresponding output battery health status evaluation index can be obtained by processing the input relevant information.

[0135] According to an embodiment of the present invention, the comparing the SOC data with the low battery setting value, if the SOC data is less than or equal to the low battery setting value, switching the target battery pack to a separate charging mode, includes:

[0136] If the SOC data of the target battery group is less than the low battery setting value, the grid-connected PCS group corresponding to the target battery group is turned on, and the off-grid PCS group corresponding to the target battery group is turned off;

[0137] Obtain the maximum output power of the diesel engine, and process the maximum output power of the diesel engine and the SOC data to obtain the initial conversion power of the grid-connected PCS group;

[0138] Obtain the maximum charging power of the grid-connected PCS group and the maximum charging power of the battery cluster, compare the maximum charging power of the grid-connected PCS group and the maximum charging power of the battery cluster, and select the charging power with the smaller value as the charging power to be compared;

[0139] If the initial conversion power of the grid-connected PCS group is greater than the charging power to be compared, the charging power to be compared is used as the conversion power of the grid-connected PCS group;

[0140] If the initial conversion power of the grid-connected PCS group is less than or equal to the charging power to be compared, the initial conversion power of the grid-connected PCS group is used as the conversion power of the grid-connected PCS group;

[0141] The conversion power of each grid-connected PCS converter is calculated according to the conversion power of the grid-connected PCS group, and the grid-connected PCS converter charges the target battery group according to the conversion power.

[0142] It should be noted that SOC (State of Charge) indicates the remaining battery power. PCS (Power Conversion System) is one of the key devices in the energy storage system. Its main function is to realize the conversion and control of electric energy between different forms. If the remaining data of the target battery group is less than the low battery power setting value, the grid-connected PCS group corresponding to the target battery group is turned on and starts to enter the charging mode, and the off-grid PCS group is turned off. The grid-connected PCS group contains multiple PCS converters. The conversion power of the grid-connected PCS group is divided by the number of grid-connected PCS converters to obtain the conversion power of each grid-connected PCS converter.

[0143] The calculation formula of the initial conversion power of the grid-connected PCS group is:

[0144] ;

[0145] in, is the initial conversion power of the grid-connected PCS group, is the maximum output power of the diesel engine, is the SOC data of the i-th target battery pack, i=1,...,n, and n is the number of target battery packs.

[0146] According to an embodiment of the present invention, if the SOC data is greater than or equal to a high battery power setting value, the target battery pack switches to a separate discharge mode, including:

[0147] If the SOC data of the target battery group is greater than the high battery power setting value, the off-grid PCS group corresponding to the target battery group is turned on, and the grid-connected PCS group corresponding to the target battery group is turned off;

[0148] Obtain the off-grid PCS group power and the maximum discharge power of the battery group corresponding to the target battery group. If the off-grid PCS group power is greater than the maximum discharge power of the battery group, the off-grid PCS group corresponding to the target battery group is shut down.

[0149] If the off-grid PCS group power is less than or equal to the maximum discharge power of the battery group, the discharge power of each off-grid PCS converter is calculated according to the off-grid PCS group power;

[0150] The off-grid PCS converter discharges the target battery pack according to the discharge power.

[0151] It should be noted that if the SOC data is greater than or equal to the high setting value of the battery power, the target battery group switches to a separate discharge mode, the off-grid PCS group corresponding to the target battery group is turned on, and the grid-connected PCS group is turned off. If the off-grid PCS group power is less than or equal to the maximum discharge power of the battery group, the off-grid PCS group power is divided by the number of off-grid PCS converters to obtain the discharge power of each off-grid PCS converter.

[0152] According to an embodiment of the present invention, if the SOC data is less than a low battery setting value and greater than a too low battery setting value, the target battery pack switches to a hybrid charge and discharge mode, including:

[0153] If the SOC data of the target battery group is less than the low battery setting value and greater than the too low battery setting value, the grid-connected PCS group and the off-grid PCS group corresponding to the target battery group are both turned on;

[0154] The grid-connected PCS converter charges the target battery pack according to the conversion power, and the off-grid PCS converter discharges the target battery pack according to the discharge power.

[0155] It should be noted that if the SOC data is less than the low battery setting value and greater than the too low battery setting value, the target battery group switches to the hybrid charge and discharge mode, and the grid-connected PCS group and the off-grid PCS group corresponding to the target battery group are both turned on.

[0156] According to an embodiment of the present invention, it also includes:

[0157] Acquiring charge and discharge efficiency data, battery pack response time data, capacity attenuation rate data, internal resistance change rate data, and terminal voltage change rate data of the target battery pack;

[0158] Processing the capacity attenuation rate data, the internal resistance change rate data, and the terminal voltage change rate data to obtain a battery pack life attenuation assessment factor;

[0159] Calculate a battery pack performance evaluation index according to the charge and discharge efficiency data, the battery pack response time data, and the battery pack life attenuation evaluation factor;

[0160] The performance evaluation standard deviation data is obtained by calculating the battery pack performance evaluation index of all target battery packs in the target battery cluster.

[0161] It should be noted that in order to evaluate the collaborative working ability of all target battery groups in the target battery cluster, the capacity attenuation rate data, the internal resistance change rate data and the terminal voltage change rate data are processed to obtain the battery group life attenuation evaluation factor, and the battery group performance evaluation index is calculated based on the charge and discharge efficiency data, the battery group response time data and the battery group life attenuation evaluation factor. The performance evaluation standard deviation data is obtained by calculating the battery group performance evaluation index of all target battery groups in the target battery cluster;

[0162] The calculation formula of the battery pack life attenuation assessment factor is:

[0163] ;

[0164] in, is the battery pack life attenuation assessment factor, is the capacity decay rate data, is the internal resistance change rate data, is the terminal voltage change rate data, , and is a preset characteristic coefficient (which can be obtained by querying the preset energy management system database);

[0165] The calculation formula of the battery pack performance evaluation index is:

[0166] ;

[0167] in, is the battery pack performance evaluation index, is the charge and discharge efficiency data, The battery pack response time data is: is the battery pack life attenuation assessment factor, is a preset characteristic coefficient (which can be obtained by querying the preset energy management system database);

[0168] The calculation formula of the performance evaluation standard deviation data is:

[0169] ;

[0170] in, is the standard deviation data for performance evaluation, is the battery pack performance evaluation index of the i-th battery pack, i=1,...,n, and n is the number of target battery packs.

[0171] According to an embodiment of the present invention, it also includes:

[0172] Acquiring overall charge and discharge efficiency data and coordinated response time data of the target battery cluster;

[0173] Calculate according to the charge and discharge efficiency data, the battery pack response time data, the overall charge and discharge efficiency data and the coordinated response time data to obtain coordinated charge and discharge deviation data;

[0174] Calculate according to the performance evaluation standard deviation data and the collaborative charge and discharge deviation data to obtain a battery pack collaborative evaluation index;

[0175] The battery group collaborative evaluation index is compared with a preset battery group collaborative evaluation index threshold, and if the threshold comparison result does not meet the preset threshold comparison result requirement, a battery group collaborative abnormality determination is performed.

[0176] It should be noted that the coordinated charge and discharge deviation data is obtained by calculating according to the charge and discharge efficiency data, the battery pack response time data, the overall charge and discharge efficiency data and the coordinated response time data;

[0177] The calculation formula of the coordinated charge and discharge deviation data is:

[0178] ;

[0179] in, For the coordinated charge and discharge deviation data, is the charge and discharge efficiency data, is the overall charge and discharge efficiency data, The battery pack response time data is: It is the collaborative response time data;

[0180] Calculate according to the performance evaluation standard deviation data and the collaborative charge and discharge deviation data to obtain a battery pack collaborative evaluation index;

[0181] The calculation formula of the battery pack synergy evaluation index is:

[0182] ;

[0183] in, is the battery pack synergy evaluation index, For the coordinated charge and discharge deviation data, is the standard deviation data for performance evaluation, is the preset characteristic coefficient (which can be obtained by querying the preset energy management system database).

[0184] The present invention discloses a control method and system for the coordinated charging and discharging of multiple battery groups in a microgrid, which obtains the charging and discharging data of the battery group from a battery management system, obtains a battery health status evaluation index based on the charging and discharging data processing, determines a target battery group based on the battery health status evaluation index, obtains the SOC data and power threshold setting data of the target battery group, selects a charging and discharging mode based on the SOC data and the power threshold setting data, and evaluates the collaborative working capabilities of different target battery groups, thereby achieving the purpose of coordinated charging and discharging control of multiple battery groups.

[0185] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0186] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed on multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0187] In addition, all functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above-mentioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

Claims

1. A control method for coordinated charging and discharging of multiple battery packs in a microgrid, characterized in that: The following steps are involved: Acquire the charge and discharge data of the battery pack from the battery management system, obtain the battery health status evaluation index according to the charge and discharge data processing, and determine the target battery pack according to the battery health status evaluation index; Acquire SOC data and power threshold setting data of the target battery pack, the power threshold setting data including a battery power too low setting value, a battery power low setting value, and a battery power high setting value; Comparing the SOC data with the low battery setting value, if the SOC data is less than or equal to the low battery setting value, switching the target battery pack to a separate charging mode; If the SOC data is greater than or equal to the high battery power setting value, the target battery pack switches to a separate discharge mode; If the SOC data is less than the low battery setting value and greater than the too low battery setting value, the target battery pack switches to a hybrid charge and discharge mode; If the SOC data is greater than or equal to the low battery setting value and less than the high battery setting value, the target battery pack maintains the current state; The method of acquiring the charge and discharge data of the battery pack from the battery management system, obtaining a battery health status evaluation index according to the charge and discharge data processing, and determining the target battery pack according to the battery health status evaluation index includes: Obtain the charge and discharge data of the battery pack from the battery management system, including voltage data, current data, temperature data, internal resistance data, charge and discharge cycle data, self-discharge rate data and capacity decay rate data; Inputting the voltage data, current data, temperature data, internal resistance data, charge and discharge cycle data, self-discharge rate data and capacity decay rate data into a preset battery health status assessment model for processing to obtain a battery health status assessment index; Comparing the battery health status evaluation index with a preset battery health status evaluation index threshold, taking the battery group whose threshold comparison result meets the preset comparison result requirement as the target battery group, and all the target battery groups constitute a target battery cluster; The comparing the SOC data with the low battery setting value, if the SOC data is less than or equal to the low battery setting value, switching the target battery pack to a separate charging mode, includes: If the SOC data of the target battery group is less than the low battery setting value, the grid-connected PCS group corresponding to the target battery group is turned on, and the off-grid PCS group corresponding to the target battery group is turned off; Obtain the maximum output power of the diesel engine, and process the maximum output power of the diesel engine and the SOC data to obtain the initial conversion power of the grid-connected PCS group; Obtain the maximum charging power of the grid-connected PCS group and the maximum charging power of the battery cluster, compare the maximum charging power of the grid-connected PCS group and the maximum charging power of the battery cluster, and select the charging power with the smaller value as the charging power to be compared; If the initial conversion power of the grid-connected PCS group is greater than the charging power to be compared, the charging power to be compared is used as the conversion power of the grid-connected PCS group; If the initial conversion power of the grid-connected PCS group is less than or equal to the charging power to be compared, the initial conversion power of the grid-connected PCS group is used as the conversion power of the grid-connected PCS group; The conversion power of each grid-connected PCS converter is calculated according to the conversion power of the grid-connected PCS group, and the grid-connected PCS converter charges the target battery group according to the conversion power.

2. The control method for coordinated charging and discharging of multiple battery packs in a microgrid according to claim 1, characterized in that: If the SOC data is greater than or equal to the battery power high setting value, the target battery pack switches to a separate discharge mode, including: If the SOC data of the target battery group is greater than the high battery power setting value, the off-grid PCS group corresponding to the target battery group is turned on, and the grid-connected PCS group corresponding to the target battery group is turned off; Obtain the off-grid PCS group power and the maximum discharge power of the battery group corresponding to the target battery group. If the off-grid PCS group power is greater than the maximum discharge power of the battery group, the off-grid PCS group corresponding to the target battery group is shut down. If the off-grid PCS group power is less than or equal to the maximum discharge power of the battery group, the discharge power of each off-grid PCS converter is calculated according to the off-grid PCS group power; The off-grid PCS converter discharges the target battery pack according to the discharge power.

3. The control method for coordinated charging and discharging of multiple battery packs in a microgrid according to claim 2, characterized in that: If the SOC data is less than a low battery setting value and greater than a too low battery setting value, the target battery pack switches to a hybrid charge and discharge mode, including: If the SOC data of the target battery group is less than the low battery setting value and greater than the too low battery setting value, the grid-connected PCS group and the off-grid PCS group corresponding to the target battery group are both turned on; The grid-connected PCS converter charges the target battery pack according to the conversion power, and the off-grid PCS converter discharges the target battery pack according to the discharge power.

4. The control method for coordinated charging and discharging of multiple battery packs in a microgrid according to claim 3, characterized in that: Also includes: Acquiring charge and discharge efficiency data, battery pack response time data, capacity attenuation rate data, internal resistance change rate data, and terminal voltage change rate data of the target battery pack; Processing the capacity attenuation rate data, the internal resistance change rate data, and the terminal voltage change rate data to obtain a battery pack life attenuation assessment factor; Calculate a battery pack performance evaluation index according to the charge and discharge efficiency data, the battery pack response time data, and the battery pack life attenuation evaluation factor; The performance evaluation standard deviation data is obtained by calculating the battery pack performance evaluation index of all target battery packs in the target battery cluster.

5. The control method for coordinated charging and discharging of multiple battery packs in a microgrid according to claim 4, characterized in that: Also includes: Acquiring overall charge and discharge efficiency data and coordinated response time data of the target battery cluster; Calculate according to the charge and discharge efficiency data, the battery pack response time data, the overall charge and discharge efficiency data and the coordinated response time data to obtain coordinated charge and discharge deviation data; Calculate according to the performance evaluation standard deviation data and the collaborative charge and discharge deviation data to obtain a battery pack collaborative evaluation index; The battery group collaborative evaluation index is compared with a preset battery group collaborative evaluation index threshold, and if the threshold comparison result does not meet the preset threshold comparison result requirement, a battery group collaborative abnormality determination is performed.

6. A control system for coordinated charging and discharging of multiple battery packs in a microgrid, characterized in that: The invention comprises a memory and a processor, wherein the memory stores a program of a control method for coordinated charging and discharging of multiple battery groups in a microgrid, and when the program of the control method for coordinated charging and discharging of multiple battery groups in a microgrid is executed by the processor, the following steps are implemented: Acquire the charge and discharge data of the battery pack from the battery management system, obtain the battery health status evaluation index according to the charge and discharge data processing, and determine the target battery pack according to the battery health status evaluation index; Acquire SOC data and power threshold setting data of the target battery pack, the power threshold setting data including a battery power too low setting value, a battery power low setting value, and a battery power high setting value; Comparing the SOC data with the low battery setting value, if the SOC data is less than or equal to the low battery setting value, switching the target battery pack to a separate charging mode; If the SOC data is greater than or equal to the high battery power setting value, the target battery pack switches to a separate discharge mode; If the SOC data is less than the low battery setting value and greater than the too low battery setting value, the target battery pack switches to a hybrid charge and discharge mode; If the SOC data is greater than or equal to the low battery setting value and less than the high battery setting value, the target battery pack maintains the current state; The method of acquiring the charge and discharge data of the battery pack from the battery management system, obtaining a battery health status evaluation index according to the charge and discharge data processing, and determining the target battery pack according to the battery health status evaluation index includes: Obtain the charge and discharge data of the battery pack from the battery management system, including voltage data, current data, temperature data, internal resistance data, charge and discharge cycle data, self-discharge rate data and capacity decay rate data; Inputting the voltage data, current data, temperature data, internal resistance data, charge and discharge cycle data, self-discharge rate data and capacity decay rate data into a preset battery health status assessment model for processing to obtain a battery health status assessment index; Comparing the battery health status evaluation index with a preset battery health status evaluation index threshold, taking the battery group whose threshold comparison result meets the preset comparison result requirement as the target battery group, and all the target battery groups constitute a target battery cluster; The comparing the SOC data with the low battery setting value, if the SOC data is less than or equal to the low battery setting value, switching the target battery pack to a separate charging mode, includes: If the SOC data of the target battery group is less than the low battery setting value, the grid-connected PCS group corresponding to the target battery group is turned on, and the off-grid PCS group corresponding to the target battery group is turned off; Obtain the maximum output power of the diesel engine, and process the maximum output power of the diesel engine and the SOC data to obtain the initial conversion power of the grid-connected PCS group; Obtain the maximum charging power of the grid-connected PCS group and the maximum charging power of the battery cluster, compare the maximum charging power of the grid-connected PCS group and the maximum charging power of the battery cluster, and select the charging power with the smaller value as the charging power to be compared; If the initial conversion power of the grid-connected PCS group is greater than the charging power to be compared, the charging power to be compared is used as the conversion power of the grid-connected PCS group; If the initial conversion power of the grid-connected PCS group is less than or equal to the charging power to be compared, the initial conversion power of the grid-connected PCS group is used as the conversion power of the grid-connected PCS group; The conversion power of each grid-connected PCS converter is calculated according to the conversion power of the grid-connected PCS group, and the grid-connected PCS converter charges the target battery group according to the conversion power.

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