CN-121984162-A - Energy storage power station SOC balance control method and device, energy storage system and medium thereof

CN121984162ACN 121984162 ACN121984162 ACN 121984162ACN-121984162-A

Abstract

The application discloses an energy storage power station SOC balance control method and device, an energy storage system and medium, wherein the energy storage power station SOC balance control method comprises the steps of respectively controlling a first energy storage unit in a plurality of energy storage units to discharge and a second energy storage unit to charge under the condition that the unit SOCs of the plurality of energy storage units of an energy storage power station are determined to be unbalanced, wherein the first unit SOCs of the first energy storage unit is larger than the second unit SOCs of the second energy storage unit; and under the condition that the unit SOCs of the plurality of energy storage units are determined to be balanced, respectively controlling the first type of energy storage unit to stop discharging and the second type of energy storage unit to stop charging. According to the method, under the condition that the set SOCs of the energy storage power stations are unbalanced, the energy storage set with larger set SOCs is controlled to discharge, and the energy storage set with smaller set SOCs is controlled to charge until the set SOCs of the energy storage power stations are restored to be balanced, so that the total energy storage power or the total power of power generation in the operation process of the energy storage power stations is improved.

Inventors

LIU YOUWEI
CHEN XIAOBO

Assignees

宁德时代新能源科技股份有限公司
厦门实证储能科技研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20241031

Claims (11)

1. The SOC balance control method for the energy storage power station is characterized by comprising the following steps of: Under the condition that the unit SOC of a plurality of energy storage units of an energy storage power station is unbalanced, respectively controlling the first type of energy storage unit in the plurality of energy storage units to discharge and the second type of energy storage unit to charge, wherein the first unit SOC of the first type of energy storage unit is larger than the second unit SOC of the second type of energy storage unit; And under the condition that the unit SOCs of the plurality of energy storage units are determined to be balanced, respectively controlling the first type of energy storage units to stop discharging and the second type of energy storage units to stop charging.
2. The method of claim 1, wherein the controlling the discharging of the first type of energy storage unit and the charging of the second type of energy storage unit, respectively, further comprises: Determining whether the energy storage power station is in an idle state, wherein no energy exchange exists between the energy storage power station and a power grid in the idle state; The controlling the discharging of the first type energy storage unit and the charging of the second type energy storage unit in the plurality of energy storage units respectively includes: and under the condition that the energy storage power station is in the idle state, controlling the first type energy storage unit to discharge the second type energy storage unit.
3. The method of claim 2, wherein the determining whether the energy storage power station is in the idle state comprises: acquiring a neutral period of the energy storage power station, wherein the energy storage power station is in the idle state in the neutral period; and determining whether the energy storage power station is in the idle state according to the neutral period and the current moment.
4. The method as recited in claim 2, further comprising: Acquiring bus voltage of a three-phase bus of the power grid under the condition that the energy storage power station is not in the idle state; and respectively controlling the discharging of the first type energy storage unit and the charging of the second type energy storage unit according to the bus voltage.
5. The method of claim 4, wherein said controlling the discharge of the first type of energy storage unit and the charging of the second type of energy storage unit according to the bus voltage, respectively, comprises: and under the condition that the bus voltage is greater than or equal to a voltage threshold, respectively controlling the first type energy storage unit to discharge based on the three-phase bus and the second type energy storage unit to charge based on the three-phase bus.
6. The method of claim 4, wherein the controlling the discharging of the first type of energy storage unit and the charging of the second type of energy storage unit according to the bus voltage respectively further comprises: And under the condition that the bus voltage is smaller than a voltage threshold, controlling the first type energy storage unit to discharge the second type energy storage unit.
7. The method according to any one of claims 1 to 6, wherein in case of determining that the set SOCs of a plurality of energy storage sets of an energy storage power station are unbalanced, controlling the first type of energy storage set to discharge and the second type of energy storage set to charge, respectively, the method further comprises: Acquiring one unit SOC of each energy storage unit to obtain a plurality of unit SOCs; And determining whether the unit SOCs of the plurality of energy storage units are balanced according to the plurality of unit SOCs.
8. The method of claim 7, wherein the determining whether the unit SOCs of the plurality of energy storage units are balanced based on the plurality of unit SOCs comprises: Respectively calculating the SOC difference value between any two unit SOCs to obtain a plurality of SOC difference values; Determining that the unit SOCs of the plurality of energy storage units are unbalanced under the condition that the SOC difference value which is larger than or equal to the SOC difference value threshold exists in the plurality of SOC difference values; And determining unit SOC balance of the plurality of energy storage units under the condition that the SOC difference value which is larger than or equal to the SOC difference value threshold value does not exist in the plurality of SOC difference values.
9. The utility model provides an energy storage power station SOC balanced control device which characterized in that includes: The first control module is used for respectively controlling the first type of energy storage units in the plurality of energy storage units to discharge and the second type of energy storage units to charge under the condition that the unit SOCs of the plurality of energy storage units of the energy storage power station are determined to be unbalanced, wherein the first unit SOCs of the first type of energy storage units are larger than the second unit SOCs of the second type of energy storage units; And the second control module is used for respectively controlling the first type energy storage unit to stop discharging and the second type energy storage unit to stop charging under the condition that the unit SOCs of the plurality of energy storage units are determined to be balanced.
10. An energy storage system, comprising: A memory; One or more processors coupled with the memory; One or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the one or more processors, the one or more applications configured to perform the energy storage power station SOC balance control method of any of claims 1-8.
11. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a program code, which is callable by a processor to perform the energy storage power station SOC balancing control method as claimed in any one of claims 1 to 8.

Description

Energy storage power station SOC balance control method and device, energy storage system and medium thereof Technical Field The application belongs to the technical field of energy storage, and particularly relates to an energy storage power station SOC balance control method and device, an energy storage system and medium. Background After a period of operation of an energy storage power station, a State of Charge (SOC) of a plurality of energy storage units of the energy storage power station is prone to imbalance for various reasons. At present, under the condition that the set SOC of an energy storage power station is unbalanced, an energy storage set with larger SOC is withdrawn from operation in the energy storage operation process of the energy storage power station, or an energy storage set with smaller SOC is withdrawn from operation in the power generation operation process of the energy storage power station, so that the total energy storage power in the operation process of the energy storage power station is lower or the total power of power generation is lower. Therefore, there is a need for SOC balancing control of energy storage power stations. Disclosure of Invention In view of the above, the embodiments of the present application provide a method and apparatus for controlling SOC balance of an energy storage power station, an energy storage system, and a medium, so as to overcome the above problems in the prior art. In a first aspect, an embodiment of the present application provides a method for controlling SOC equalization of an energy storage power station, including: Under the condition that the unit SOCs of a plurality of energy storage units of the energy storage power station are unbalanced, respectively controlling the first type of energy storage units in the plurality of energy storage units to discharge and the second type of energy storage units to charge, wherein the first unit SOCs of the first type of energy storage units are larger than the second unit SOCs of the second type of energy storage units; And under the condition that the unit SOCs of the plurality of energy storage units are determined to be balanced, respectively controlling the first type of energy storage unit to stop discharging and the second type of energy storage unit to stop charging. According to the scheme provided by the application, under the condition that the set SOC of the energy storage power station is unbalanced, the discharge of the energy storage set with larger set SOC and the charge of the energy storage set with smaller set SOC are controlled until the set SOC of the energy storage power station is restored to be balanced, the energy storage set with larger SOC can be restrained from exiting to operate in the energy storage operation process of the energy storage power station, or the energy storage set with smaller SOC is restrained from exiting to operate in the power generation operation process of the energy storage power station, and the improvement of the total energy storage power or the total power generation power in the power generation operation process of the energy storage power station is facilitated. In some optional embodiments, before the first type of energy storage unit in the plurality of energy storage units is controlled to discharge and the second type of energy storage unit is charged, the method further includes: determining whether the energy storage power station is in an idle state, wherein no energy exchange exists between the energy storage power station and the power grid in the idle state; respectively controlling the discharging of a first type energy storage unit and the charging of a second type energy storage unit in the plurality of energy storage units, comprising: and under the condition that the energy storage power station is in an idle state, controlling the first type energy storage unit to discharge the second type energy storage unit. According to the scheme provided by the embodiment, under the condition that the energy storage power station is in an idle state without energy exchange with the power grid, the energy storage unit of the energy storage power station is controlled to automatically perform SOC equalization, so that interference of an equalization control process on the power grid can be reduced, and the running stability of the power grid is improved. Wherein, in some alternative embodiments, determining whether the energy storage power station is in an idle state comprises: Acquiring a neutral period of an energy storage power station, wherein the energy storage power station is in an idle state in the neutral period; and determining whether the energy storage power station is in an idle state according to the neutral period and the current moment. According to the scheme provided by the embodiment, whether the energy storage power station is in the idle state is judged according to the current moment and the neutral period, so t