CN113178928B - Charging and discharging current control method for parallel battery energy storage system - Google Patents
Charging and discharging current control method for parallel battery energy storage system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
本发明公开了一种并联电池储能系统的充放电电流控制方法，包括对储能系统中多个正在并联运行的电池堆储能系统进行序号标定，分别接收每个电池堆储能系统的系统参数信息流；计算维持电网母线系统功率平衡所需的电池堆储能系统充放电电流总参考值，计算出平均充放电电流参考值；计算每个电池堆储能系统的电池堆荷电状态和端电压，计算电池堆储能系统的电池堆荷电状态平均值，计算电池堆储能系统的电池堆端电压平均值，根据和计算每个电池堆充放电电流偏差；计算出每个电池堆储能系统实际充放电电流参考值；通过总控制单元对每个电池堆储能系统进行充放电电流控制；具有延长电池堆使用寿命和保证电池堆良好的性能等优点。
The present invention discloses a charge and discharge current control method for a parallel battery energy storage system, comprising calibrating the serial numbers of a plurality of battery stack energy storage systems operating in parallel in the energy storage system, receiving the system parameter information flow of each battery stack energy storage system respectively; calculating the total reference value of the charge and discharge current of the battery stack energy storage system required to maintain the power balance of the power grid bus system; , calculate the average charge and discharge current reference value ; Calculate the battery stack state of charge for each battery stack energy storage system and terminal voltage , calculate the average value of the battery stack state of charge of the battery stack energy storage system , calculate the average voltage of the battery stack terminal of the battery stack energy storage system ,according to and Calculate the charge and discharge current deviation of each battery stack ; Calculate the actual charge and discharge current reference value of each battery stack energy storage system ; The charging and discharging current of each battery stack energy storage system is controlled through the main control unit; it has the advantages of extending the service life of the battery stack and ensuring the good performance of the battery stack.
Description
技术领域Technical Field
本发明涉及并联电池堆充放电电流控制技术领域，尤其涉及一种并联电池储能系统的充放电电流控制方法。The present invention relates to the technical field of parallel battery stack charging and discharging current control, and in particular to a charging and discharging current control method for a parallel battery energy storage system.
背景技术Background Art
储能电站在智能电网、可再生能源接入、分布式发电、微电网以及电动汽车等应用中是必须的支撑产品。它可以有效地实现需系统能量管理、消除昼夜峰谷差、平滑波动，提高电力设备运行效率、降低供电成本；还可以作为促进可再生能源应用，提高电网运行稳定性、调整频率、补偿负荷波动的一种有效手段。随着新能源发电技术发展和电动汽车退役储能电池的日益增加，储能电站更受关注。Energy storage power stations are essential supporting products in applications such as smart grids, renewable energy access, distributed generation, microgrids, and electric vehicles. They can effectively manage the energy of the system, eliminate peak and valley differences during the day and night, smooth fluctuations, improve the operating efficiency of power equipment, and reduce power supply costs; they can also be used as an effective means to promote the application of renewable energy, improve the stability of grid operation, adjust frequency, and compensate for load fluctuations. With the development of new energy power generation technology and the increasing number of retired energy storage batteries for electric vehicles, energy storage power stations have received more attention.
储能电站中每个电池堆存容量可以通过每个电池堆的荷电状态(SOC)来进行判断，即SOC大的电池堆存储容量大，反之存储容量小。因此，在充电过程中，SOC大的电池堆充电电流要小于SOC小的电池堆充电电流；在放电过程中，SOC大的电池堆放电电流大于SOC小的电池堆放电电流。这就会使每个储能电池堆的SOC趋于平衡，提高电池堆使用寿命。但是，电池堆的容量和性能还受到使用环境、循环次数等各种因素制约。比如，初始SOC相同性能差电池堆可能在没有达到SOC平衡之前就可能充满（端电压达到允许最高值）或放完（端电压达到允许最低值）。这样，必须要停止对该电池堆充电或放电，以保护电池堆免遭损坏。所以，仅靠电池堆的SOC来分配充放电电流的方法并不完美。而在现有文献和专利中提及的分布式储能系统中电池堆充放电电流基本也都是根据SOC来进行分配的，比如，基于SOC各种下垂法分配充放电电流。The storage capacity of each battery stack in the energy storage power station can be judged by the state of charge ( SOC ) of each battery stack, that is, the battery stack with a large SOC has a large storage capacity, and vice versa. Therefore, during the charging process, the charging current of the battery stack with a large SOC is smaller than the charging current of the battery stack with a small SOC ; during the discharging process, the discharge current of the battery stack with a large SOC is larger than the discharge current of the battery stack with a small SOC . This will make the SOC of each energy storage battery stack tend to balance and improve the service life of the battery stack. However, the capacity and performance of the battery stack are also restricted by various factors such as the use environment and the number of cycles. For example, a battery stack with the same initial SOC and poor performance may be fully charged (the terminal voltage reaches the maximum allowable value) or fully discharged (the terminal voltage reaches the minimum allowable value) before reaching SOC balance. In this way, it is necessary to stop charging or discharging the battery stack to protect the battery stack from damage. Therefore, the method of allocating the charge and discharge current based solely on the SOC of the battery stack is not perfect. In the distributed energy storage system mentioned in the existing literature and patents, the charge and discharge current of the battery stack is basically allocated based on the SOC , for example, the charge and discharge current is allocated based on various SOC droop methods.
所以本发明提供一种并联电池储能系统的充放电电流控制方法。解决上述问题。Therefore, the present invention provides a charge and discharge current control method for a parallel battery energy storage system to solve the above problems.
发明内容Summary of the invention
本发明所要解决的技术问题在于，现有的仅靠电池堆的SOC来分配充放电电流的方法存在误差，所以提供一种并联电池储能系统的充放电电流控制方法，所述并联电池储能系统的充放电电流控制方法包括：The technical problem to be solved by the present invention is that the existing method of distributing the charge and discharge current only by the SOC of the battery stack has errors, so a charge and discharge current control method of a parallel battery energy storage system is provided, and the charge and discharge current control method of the parallel battery energy storage system includes:
电网母线、参数信息流母线、多个电池堆储能系统和总控制单元，所述电网母线同时与多个所述电池堆储能系统电连接，多个所述电池堆储能系统同时与所述参数信息流母线电连接，所述参数信息流母线与所述总控制单元电连接，所述充放电电流控制方法包括：A power grid bus, a parameter information flow bus, a plurality of battery stack energy storage systems and a total control unit, wherein the power grid bus is electrically connected to the plurality of battery stack energy storage systems at the same time, and the plurality of battery stack energy storage systems are electrically connected to the parameter information flow bus at the same time, and the parameter information flow bus is electrically connected to the total control unit, and the charge and discharge current control method comprises:
通过总控制单元对多个正在并联运行的电池堆储能系统进行序号标定，序号依次分别标定为1、2、3、…n；The multiple battery stack energy storage systems running in parallel are serially calibrated by the main control unit, and the serial numbers are calibrated as 1, 2, 3, ... n respectively;
通过总控制单元分别接收第1个电池堆储能系统的系统参数信息流、第2个电池堆储能系统的系统参数信息流、…和第n个电池堆储能的系统参数信息流；Receiving the system parameter information flow of the first battery stack energy storage system, the system parameter information flow of the second battery stack energy storage system, ... and the system parameter information flow of the nth battery stack energy storage system respectively through the general control unit;
通过总控制单元计算维持电网母线系统功率平衡所需的电池堆储能系统充放电电流总参考值 ，同时计算出平均充放电电流参考值；The total reference value of the battery stack energy storage system charging and discharging current required to maintain the power balance of the grid bus system is calculated by the total control unit , and calculate the average charge and discharge current reference value ;
通过总控制单元计算每个电池堆储能系统的电池堆荷电状态和端电压，计算电池堆储能系统的荷电状态平均值，计算电池堆储能系统的端电压平均值，根据电池堆储能系统的荷电状态平均值和电池堆储能系统的端电压平均值计算每个电池堆充放电电流偏差；The overall control unit calculates the battery stack state of charge of each battery stack energy storage system and terminal voltage , calculate the average state of charge of the battery stack energy storage system , calculate the average terminal voltage of the battery stack energy storage system , according to the average state of charge of the battery stack energy storage system and the average terminal voltage of the battery stack energy storage system Calculate the charge and discharge current deviation of each battery stack ;
通过总控制单元计算出每个电池堆储能系统实际充放电电流参考值；The actual charge and discharge current reference value of each battery stack energy storage system is calculated by the total control unit ;
通过总控制单元对每个电池堆储能系统进行充放电。Each battery stack energy storage system is charged and discharged through the main control unit.
进一步地，所述和所述均为大于零且小于1的偏差系数。Furthermore, the and The coefficient of variation is greater than zero and less than 1.
进一步地，所述的值大于所述。Furthermore, the The value is greater than the .
进一步地，所述电池储能堆系统包括电池堆、双向变换器和参数信息检测装置所述双向变换器用于连接所述电网母线和所述电池堆，所述参数信息检测装置用于采集电池堆的参数信息并整合成参数信息流发送至总控制单元。Furthermore, the battery energy storage stack system includes a battery stack, a bidirectional converter and a parameter information detection device. The bidirectional converter is used to connect the power grid bus and the battery stack, and the parameter information detection device is used to collect parameter information of the battery stack and integrate it into a parameter information stream and send it to the main control unit.
进一步地，所述通过总控制单元计算出每个电池堆储能系统实际充放电电流参考值包括：Furthermore, the actual charge and discharge current reference value of each battery stack energy storage system is calculated by the overall control unit. include:
当电池堆储能系统实际为放电状态时，通过总控制单元计算每个电池堆储能系统实际放电电流参考值为 When the battery stack energy storage system is actually in a discharging state, the total control unit calculates the actual discharge current reference value of each battery stack energy storage system as
当电池堆储能系统实际为充电状态时，通过总控制单元计算每个电池堆储能系统实际充电电流参考值为。When the battery stack energy storage system is actually in a charging state, the total control unit calculates the actual charging current reference value of each battery stack energy storage system. .
进一步地，所述通过总控制单元计算每个电池堆储能系统的荷电状态和端电压包括：Furthermore, the state of charge of each battery stack energy storage system is calculated by the overall control unit. and terminal voltage include:
通过总控制单元计算每个电池堆储能系统的荷电状态；The overall control unit calculates the state of charge of each battery stack energy storage system ;
通过总控制单元接收每个电池堆储能系统的端电压。The terminal voltage of each battery stack energy storage system is received by the main control unit .
进一步地，所述通过总控制单元计算每个电池堆储能系统的荷电状态包括：Furthermore, the state of charge of each battery stack energy storage system is calculated by the overall control unit. include:
,为电池堆剩余容量，为电池堆基准容量。 , is the remaining capacity of the battery stack, It is the base capacity of the battery stack.
进一步地，每个所述电池堆储能系统的标称参数相同。Furthermore, the nominal parameters of each of the battery stack energy storage systems are the same.
实施本发明，具有如下有益效果：The implementation of the present invention has the following beneficial effects:
1.本发明提供的并联电池储能系统的充放电电流控制方法能够依据每个电池堆的SOC和端电压，实时计算所有正在运行的电池堆SOC平均值和端电压平均值，并根据每个电池的SOC和端电压与对应平均值关系，动态分配电池堆充放电电流。这样在考虑电池堆端电压的情况下，使每个电池堆的SOC尽可能趋于平衡，延长电池堆使用寿命、保证电池堆良好的性能和提高电池堆利用率。1. The charge and discharge current control method of the parallel battery energy storage system provided by the present invention can calculate the average SOC and terminal voltage of all running battery stacks in real time according to the SOC and terminal voltage of each battery stack, and dynamically allocate the battery stack charge and discharge current according to the relationship between the SOC and terminal voltage of each battery and the corresponding average value. In this way, the SOC of each battery stack is made as balanced as possible while considering the terminal voltage of the battery stack, thereby extending the service life of the battery stack, ensuring good performance of the battery stack and improving the utilization rate of the battery stack.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1是本发明的流程图。FIG. 1 is a flow chart of the present invention.
具体实施方式DETAILED DESCRIPTION
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
实施例Example
请参阅说明书附图1，本实施例中所要解决的技术问题在于，现有的仅靠电池堆的SOC来分配充放电电流的方法存在误差，所以提供一种并联电池储能系统的充放电电流控制方法，本发明主要针对标称参数相同的同类型电池堆，并联电池储能系统的充放电电流控制方法包括：Please refer to Figure 1 of the specification. The technical problem to be solved in this embodiment is that the existing method of distributing the charge and discharge current only by the SOC of the battery stack has errors, so a charge and discharge current control method for a parallel battery energy storage system is provided. The present invention is mainly aimed at the same type of battery stacks with the same nominal parameters. The charge and discharge current control method for a parallel battery energy storage system includes:
电网母线、参数信息流母线、多个电池堆储能系统和总控制单元，电网母线同时与多个电池堆储能系统电连接，多个电池堆储能系统同时与参数信息流母线电连接，参数信息流母线与总控制单元电连接；A power grid bus, a parameter information flow bus, multiple battery stack energy storage systems and a total control unit, the power grid bus is electrically connected to the multiple battery stack energy storage systems at the same time, the multiple battery stack energy storage systems are electrically connected to the parameter information flow bus at the same time, and the parameter information flow bus is electrically connected to the total control unit;
所述充放电电流控制方法包括：The charge and discharge current control method comprises:
通过总控制单元对多个电池堆储能系统进行序号标定，序号依次分别标定为1、2、3、…n；The multiple battery stack energy storage systems are serially calibrated by the general control unit, and the serial numbers are calibrated as 1, 2, 3, ... n respectively;
通过总控制单元分别接收第1个电池堆储能系统的系统参数信息流、第2个电池堆储能系统的系统参数信息流、…和第n个电池堆储能的系统参数信息流；Receiving the system parameter information flow of the first battery stack energy storage system, the system parameter information flow of the second battery stack energy storage system, ... and the system parameter information flow of the nth battery stack energy storage system respectively through the general control unit;
通过总控制单元计算维持电网母线系统功率平衡所需的电池堆储能系统充放电电流总参考值 ，同时计算出平均充放电电流参考值；The total reference value of the battery stack energy storage system charging and discharging current required to maintain the power balance of the grid bus system is calculated by the total control unit , and calculate the average charge and discharge current reference value ;
通过总控制单元计算每个电池堆储能系统的电池堆荷电状态和端电压，计算电池堆储能系统的荷电状态平均值，计算电池堆储能系统的端电压平均值，根据电池堆储能系统的荷电状态平均值和电池堆储能系统的端电压平均值计算每个电池堆充放电电流偏差；The overall control unit calculates the battery stack state of charge of each battery stack energy storage system and terminal voltage , calculate the average state of charge of the battery stack energy storage system , calculate the average terminal voltage of the battery stack energy storage system , according to the average state of charge of the battery stack energy storage system and the average terminal voltage of the battery stack energy storage system Calculate the charge and discharge current deviation of each battery stack ;
通过总控制单元计算出每个电池堆储能系统实际充放电电流参考值;The actual charge and discharge current reference value of each battery stack energy storage system is calculated by the total control unit ;
通过总控制单元对每个电池堆储能系统进行充放电。Each battery stack energy storage system is charged and discharged through the main control unit.
和均为大于零且小于1的偏差系数。 and The coefficient of variation is greater than zero and less than 1.
的值大于。 The value is greater than .
电池储能堆系统包括电池堆、双向变换器和参数信息检测装置双向变换器用于连接电网母线和电池堆，参数信息检测装置用于采集电池堆的参数信息并整合成参数信息流发送至总控制单元。The battery energy storage stack system includes a battery stack, a bidirectional converter and a parameter information detection device. The bidirectional converter is used to connect the grid bus and the battery stack. The parameter information detection device is used to collect parameter information of the battery stack and integrate it into a parameter information stream and send it to the main control unit.
通过总控制单元计算出每个电池堆储能系统实际充放电电流参考值包括：The actual charge and discharge current reference value of each battery stack energy storage system is calculated by the total control unit include:
当电池堆储能系统实际为放电状态时，通过总控制单元计算每个电池堆储能系统实际放电电流参考值为 When the battery stack energy storage system is actually in a discharging state, the total control unit calculates the actual discharge current reference value of each battery stack energy storage system as
当电池堆储能系统实际为充电状态时，通过总控制单元计算每个电池堆储能系统实际充电电流参考值为。When the battery stack energy storage system is actually in a charging state, the total control unit calculates the actual charging current reference value of each battery stack energy storage system. .
通过总控制单元计算每个电池堆储能系统的荷电状态和端电压包括：The overall control unit calculates the state of charge of each battery stack energy storage system and terminal voltage include:
通过总控制单元计算每个电池堆储能系统的荷电状态；The overall control unit calculates the state of charge of each battery stack energy storage system ;
通过总控制单元接收每个电池堆储能系统的端电压。The terminal voltage of each battery stack energy storage system is received by the main control unit .
通过总控制单元计算每个电池堆储能系统的荷电状态包括：The overall control unit calculates the state of charge of each battery stack energy storage system include:
,为电池堆剩余容量，为电池堆基准容量。 , is the remaining capacity of the battery stack, It is the base capacity of the battery stack.
尽管已经示出和描述了本发明的实施例，对于本领域的普通技术人员而言，可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型，本发明的范围由所附权利要求及其等同物限定。Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
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