CN-115102197-B - Battery energy storage coordination control method and device and related equipment

CN115102197BCN 115102197 BCN115102197 BCN 115102197BCN-115102197-B

Abstract

The application discloses a battery energy storage coordination control method, a device and related equipment, wherein the method comprises the steps of obtaining compensation power of a power system, wherein the compensation power is used for representing power difference between a power generation unit and a power utilization unit in the power system; and determining the interaction power of each battery energy storage based on the operation mode and combining the charge state and the rated interaction power of each battery energy storage. When the interactive power of each battery energy storage is determined, the charge states and rated interactive power of each battery energy storage are considered, so that the charge states of each battery energy storage connected in parallel in the energy storage unit gradually tend to be the same, the situation that the charge state of one battery energy storage reaches 100% and the charge states of other battery energy storage is far less than 100% is avoided, the safe operation of the battery energy storage is guaranteed, and the service life of the battery energy storage is prolonged.

Inventors

GUO TIANYU
YU HAO
DUAN YAO
GUO QI
ZHU YIHUA
HUANG LIBIN
ZENG GUANMING
LUO CHAO
LU XUAN
GONG DAQIAN
LIN YONG

Assignees

南方电网科学研究院有限责任公司
广东电网有限责任公司

Dates

Publication Date: 20260508
Application Date: 20220519

Claims (7)

1. The battery energy storage coordination control method is characterized by comprising the following steps of: Acquiring compensation power of the power system, wherein the compensation power is used for representing a power difference between a power generation unit and a power utilization unit in the power system; Determining an operation mode of an energy storage unit of the power system according to rated interaction power of energy storage of each battery and the compensation power; Based on the operation mode, determining the interaction power of each battery energy storage by combining the charge state and rated interaction power of each battery energy storage; And determining an operation mode of the energy storage unit according to rated interaction power of energy storage of each battery in the energy storage unit of the power system and the compensation power, wherein the process comprises the following steps: Determining the mode of operation of the energy storage unit using the following equation : Wherein, the To compensate for the absolute value of the power; Indicating that the compensation power is positive; Indicating that the compensation power is negative; Is the first Rated interactive power of energy storage of the batteries; the total number of energy storage of the batteries connected in parallel in the energy storage unit is calculated; The first mode is used for restricting the charging mode when the compensation power is smaller than the rated interaction power; The second mode is used for restraining a discharge mode when the compensation power is smaller than the rated interaction power; A third mode for restricting a charging mode when the compensation power is between the rated interaction power and the total rated interaction power; A fourth mode for restricting a discharge mode when the compensation power is smaller than the rated interaction power; A fifth mode for constraining a charging mode and a discharging mode when the compensation power is greater than the total rated interaction power; based on the operation mode, combining the charge state and rated interaction power of each battery energy storage, the process of determining the interaction power of each battery energy storage comprises the following steps: The following equation is used to determine the first Charging power of energy storage of each battery : Wherein, the Is the first The state of charge of the energy stored by the individual cells, In order to compensate for the absolute value of the power, The total number of energy storage of the batteries connected in parallel in the energy storage unit is calculated; based on the operation mode, combining the charge state and rated interaction power of each battery energy storage, the process of determining the interaction power of each battery energy storage comprises the following steps: The following equation is used to determine the first Discharge power of energy storage of each battery : Wherein, the Is the first The state of charge of the energy stored by the individual cells, In order to compensate for the absolute value of the power, And storing the total number of the energy stored by the batteries connected in parallel in the energy storage unit.
2. The method of claim 1, wherein the operating mode is a third mode, and wherein determining the interaction power of each battery in combination with the state of charge of each battery and the rated interaction power based on the operating mode comprises: The following equation is used to determine the first Charging power of energy storage of each battery : Wherein, the Is the first The state of charge of the energy stored by the individual cells, In order to compensate for the absolute value of the power, For the total number of battery energy storage in parallel in the energy storage unit, Is the first Rated interactive power stored by the batteries.
3. The method of claim 1, wherein the operating mode is a fourth mode, and wherein determining the interaction power of each battery in combination with the state of charge of each battery and the rated interaction power based on the operating mode comprises: The following equation is used to determine the first Discharge power of energy storage of each battery : Wherein, the Is the first The state of charge of the energy stored by the individual cells, In order to compensate for the absolute value of the power, For the total number of battery energy storage in parallel in the energy storage unit, Is the first Rated interactive power stored by the batteries.
4. The method of claim 1, wherein the operating mode is a fifth mode, and wherein determining the interaction power of each battery in combination with the state of charge of each battery and the rated interaction power based on the operating mode comprises: The following equation is used to determine the first Interactive power of individual battery energy storage : Wherein, the Is the first Rated interactive power stored by the batteries.
5. A battery energy storage coordination control device, characterized by comprising: The compensation power acquisition unit is used for acquiring compensation power of the power system, and the compensation power is used for representing the power difference between the power generation unit and the power utilization unit in the power system; the operation mode determining unit is used for determining the operation mode of the energy storage unit according to the rated interaction power of energy storage of each battery in the energy storage unit of the power system and the compensation power; The interaction power determining unit is used for determining the interaction power of each battery energy storage by combining the charge state of each battery energy storage and the rated interaction power based on the operation mode; The operation mode determining unit determines an operation mode of the energy storage unit according to rated interaction power stored by each battery in the energy storage unit of the power system and the compensation power, and the operation mode determining unit comprises the following steps: Determining the mode of operation of the energy storage unit using the following equation : Wherein, the To compensate for the absolute value of the power; Indicating that the compensation power is positive; Indicating that the compensation power is negative; Is the first Rated interactive power of energy storage of the batteries; the total number of energy storage of the batteries connected in parallel in the energy storage unit is calculated; The first mode is used for restricting the charging mode when the compensation power is smaller than the rated interaction power; The second mode is used for restraining a discharge mode when the compensation power is smaller than the rated interaction power; A third mode for restricting a charging mode when the compensation power is between the rated interaction power and the total rated interaction power; A fourth mode for restricting a discharge mode when the compensation power is smaller than the rated interaction power; A fifth mode for constraining a charging mode and a discharging mode when the compensation power is greater than the total rated interaction power; the interactive power determining unit determines the interactive power of each battery energy storage based on the operation mode by combining the charge state of each battery energy storage and rated interactive power, and comprises the following steps: The following equation is used to determine the first Charging power of energy storage of each battery : Wherein, the Is the first The state of charge of the energy stored by the individual cells, In order to compensate for the absolute value of the power, The total number of energy storage of the batteries connected in parallel in the energy storage unit is calculated; The interactive power determining unit determines the interactive power of each battery energy storage based on the operation mode by combining the charge state of each battery energy storage and rated interactive power, and comprises the following steps: The following equation is used to determine the first Discharge power of energy storage of each battery : Wherein, the Is the first The state of charge of the energy stored by the individual cells, In order to compensate for the absolute value of the power, And storing the total number of the energy stored by the batteries connected in parallel in the energy storage unit.
6. The battery energy storage coordination control device is characterized by comprising a memory and a processor; the memory is used for storing programs; The processor is configured to execute the program to implement the steps of the battery energy storage coordination control method according to any one of claims 1 to 4.
7. A storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the battery energy storage coordination control method of any one of claims 1-4.

Description

Battery energy storage coordination control method and device and related equipment Technical Field The application relates to the technical field of energy storage systems, in particular to a battery energy storage coordination control method, a device and related equipment. Background The access proportion of new energy sources such as wind power, photovoltaic power generation and the like in the novel power system is larger and larger, and because the output of wind power and photovoltaic power has uncertainty, and the supply and demand of source load in the system are difficult to predict in real time and accurately, the power of the system needs to be adjusted by adopting an energy storage unit so as to ensure the safe and stable operation of the system. Among them, battery energy storage is one of the most common forms of energy storage, and it is required to ensure that the state of charge (SOC) of the battery energy storage is less than 100% and the output power does not exceed the rated value. When a plurality of battery energy storage are operated in parallel, the traditional processing method is that the plurality of battery energy storage equally bears the dynamic power of the system or bears the dynamic power of the system in equal proportion according to the rated capacity of the battery energy storage, and the operation mode can lead to that some battery energy storage SOC in the system reaches 100 percent, thereby causing unbalanced operation of the battery energy storage and affecting the service life of the battery energy storage. How to coordinate the control to the battery energy storage system of parallel operation in the novel electric power system, avoid appearing that a certain battery energy storage SOC reaches 100%, and the condition that other battery energy storage SOCs are less than 100% to guarantee the safe operation of battery energy storage, prolong its life, and then guarantee novel electric power system safety, stability, economic operation be need the problem of focus. Disclosure of Invention In view of the above, the application provides a battery energy storage coordination control method, a device and related equipment, so as to realize coordination control of energy storage of each battery in an energy storage unit. In order to achieve the above object, a first aspect of the present application provides a battery energy storage coordination control method, including: Acquiring compensation power of the power system, wherein the compensation power is used for representing a power difference between a power generation unit and a power utilization unit in the power system; Determining an operation mode of an energy storage unit of the power system according to rated interaction power of energy storage of each battery and the compensation power; And based on the operation mode, determining the interaction power of each battery energy storage by combining the charge state and rated interaction power of each battery energy storage. Preferably, the process of determining the operation mode of the energy storage unit according to the rated interaction power stored by each battery in the energy storage unit of the power system and the compensation power includes: the following equation is used to determine the operating mode S of the energy storage unit: wherein, delta P is the absolute value of the compensation power, in is positive, out is negative; The method comprises the steps of setting a rated interaction power for the ith battery energy storage, setting n as the total number of battery energy storage connected in parallel in an energy storage unit, setting a model1 as a first mode for restraining a charging mode when the compensation power is smaller than the rated interaction power, setting a model2 as a second mode for restraining a discharging mode when the compensation power is smaller than the rated interaction power, setting a model3 as a third mode for restraining the charging mode when the compensation power is between the rated interaction power and the total rated interaction power, setting a model4 as a fourth mode for restraining the discharging mode when the compensation power is smaller than the rated interaction power, and setting a model5 as a fifth mode for restraining the charging mode and the discharging mode when the compensation power is larger than the total rated interaction power. Preferably, the operation mode is a first mode, and the process of determining the interaction power of each battery energy storage by combining the charge state of each battery energy storage and the rated interaction power based on the operation mode comprises the following steps: The charging power P i of the ith battery storage is determined using the following equation: the SOC i is the state of charge of the i-th battery, Δp is the absolute value of the compensation power, and n is the total number of the battery energy storage in parallel in the energy storage