CN-121984165-A - In-phase SOC balance control method, control device, energy storage system and medium

CN121984165ACN 121984165 ACN121984165 ACN 121984165ACN-121984165-A

Abstract

The application discloses an in-phase SOC balance control method, a control device, an energy storage unit and a medium, wherein the method comprises the steps of determining whether the in-phase SOC of a target phase energy storage battery module is balanced or not under the condition that a three-phase energy storage battery module of the energy storage unit is in an operating state; under the condition that the in-phase SOC of the target phase energy storage battery module is unbalanced, determining an energy storage battery pack to be processed from a plurality of target energy storage battery packs of the target phase energy storage battery module according to the preset redundancy quantity, controlling the energy storage battery pack to be processed to be switched from an operating state to a hot standby state, and under the condition that the in-phase SOC of the target phase energy storage battery module is balanced, controlling the energy storage battery pack to be processed to be switched from the hot standby state to the operating state. According to the method, under the condition that the in-phase SOC of the three-phase energy storage battery module of the energy storage unit is unbalanced, the energy storage battery pack is controlled to temporarily quit operation according to the preset redundancy quantity, and the energy efficiency utilization rate of the energy storage unit 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 (12)

1. An in-phase SOC equalization control method, comprising: under the condition that three-phase energy storage battery modules of an energy storage unit are in an operating state, determining whether the in-phase SOC of a target phase energy storage battery module is balanced, wherein the target phase energy storage battery module is at least one phase energy storage battery module in the three-phase energy storage battery modules; Under the condition that the in-phase SOC of the target phase energy storage battery module is unbalanced, determining an energy storage battery pack to be processed from a plurality of target energy storage battery packs of the target phase energy storage battery module according to the preset redundancy quantity of the target phase energy storage battery module; controlling the energy storage battery pack to be processed to be switched from the running state to a hot standby state; and under the condition that the in-phase SOC of the target phase energy storage battery module is determined to be balanced, controlling the energy storage battery pack to be processed to be switched from the hot standby state to the running state.
2. The method of claim 1, wherein the determining a pending energy storage battery pack from a plurality of target energy storage battery packs of the target phase energy storage battery module according to a preset redundancy number of the target phase energy storage battery module comprises: And sequentially selecting the target energy storage battery packs with the preset redundancy number from the target phase energy storage battery modules according to the SOC (state of charge) sequence of each target energy storage battery pack in the target phase energy storage battery modules to obtain the energy storage battery packs to be processed.
3. The method according to claim 2, wherein the operation state is a discharge state, and the sequentially selecting the target energy storage battery packs with the preset redundancy number from the target phase energy storage battery modules according to the SOC order of each target energy storage battery pack in the target phase energy storage battery modules to obtain the energy storage battery pack to be processed includes: And sequentially selecting the target energy storage battery packs with the preset redundancy number according to the sequence of the SOC of each target energy storage battery pack in the target phase energy storage battery module from small to large to obtain the energy storage battery packs to be processed.
4. The method according to claim 2, wherein the running state is a charging state, and the sequentially selecting the target energy storage battery packs with the preset redundancy number from the target phase energy storage battery modules according to the SOC order of each target energy storage battery pack in the target phase energy storage battery modules to obtain the energy storage battery pack to be processed includes: and sequentially selecting the target energy storage battery packs with the preset redundancy number according to the sequence of the SOC of each target energy storage battery pack in the target phase energy storage battery module from large to small to obtain the energy storage battery packs to be processed.
5. The method according to any one of claims 1 to 4, wherein before determining a to-be-processed energy storage battery pack from a plurality of target energy storage battery packs of the target phase energy storage battery module according to a preset redundancy amount of the target phase energy storage battery module, the method further comprises: Determining whether the target phase energy storage battery module is configured with a redundant control function; the determining an energy storage battery pack to be processed from a plurality of target energy storage battery packs of the target phase energy storage battery module according to the preset redundancy number of the target phase energy storage battery module includes: And under the condition that the target phase energy storage battery module is determined to be configured with a redundancy control function, determining an energy storage battery pack to be processed from a plurality of target energy storage battery packs of the target phase energy storage battery module according to the preset redundancy quantity.
6. The method according to any one of claims 1 to 4, wherein a valve control is provided in the three-phase energy storage battery module in one-to-one correspondence with each energy storage battery pack, and the valve control is used for modulating a modulation signal of an energy storage converter of the corresponding energy storage battery pack; The controlling the energy storage battery pack to be processed to be switched from the running state to the hot standby state comprises the following steps: And sending a modulation instruction to a target valve control corresponding to the energy storage battery pack to be processed, so that the amplitude of the modulation signal of the target energy storage converter for modulating the energy storage battery pack to be processed by the target valve control is zero.
7. The method according to any one of claims 1 to 4, wherein determining whether the in-phase SOC of the target phase energy storage battery module is equalized with the three-phase energy storage battery module of the energy storage unit in an operating state, comprises: Under the condition that the three-phase energy storage battery module is in the running state, collecting a plurality of target SOCs (state of charge) of the target energy storage battery modules of the target phase energy storage battery module, wherein each target SOC corresponds to one target energy storage battery; calculating target SOC dispersion of the target phase energy storage battery module according to the target SOCs; And determining whether the in-phase SOC of the target phase energy storage battery module is balanced according to the target SOC dispersion.
8. The method of claim 7, wherein the determining whether the intra-phase SOC of the target phase energy storage battery module is equalized based on the target SOC dispersion comprises: Determining that the intra-phase SOC of the target phase energy storage battery module is unbalanced if the target SOC dispersion is greater than or equal to a SOC dispersion threshold; And determining in-phase SOC balance of the target phase energy storage battery module under the condition that the target SOC dispersion is smaller than the SOC dispersion threshold value.
9. The method of claim 7, wherein the calculating the target SOC dispersion for the target phase energy storage battery module from the plurality of target SOCs comprises: Calculating a target SOC mean value and a target SOC standard deviation according to the target SOCs respectively; and calculating the target SOC dispersion according to the target SOC mean and the target SOC standard deviation.
10. An in-phase SOC equalization control device, comprising: The first determining module is used for determining whether the in-phase SOC of a target phase energy storage battery module is balanced or not under the condition that three phase energy storage battery modules of the energy storage unit are in an operating state, wherein the target phase energy storage battery module is at least one phase energy storage battery module in the three phase energy storage battery modules; The second determining module is used for determining an energy storage battery pack to be processed from a plurality of target energy storage battery packs of the target phase energy storage battery module according to the preset redundancy quantity of the target phase energy storage battery module under the condition that the in-phase SOC of the target phase energy storage battery module is determined to be unbalanced; the first control module is used for controlling the energy storage battery pack to be processed to be switched from the running state to the hot standby state; And the second control module is used for controlling the energy storage battery pack to be processed to be switched from the hot standby state to the running state under the condition that the in-phase SOC of the target phase energy storage battery module is determined to be balanced.
11. 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 method of any of claims 1-9.
12. 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 for executing the method according to any one of claims 1 to 9.

Description

In-phase SOC balance control method, control device, energy storage system and medium Technical Field The application belongs to the technical field of energy storage, and particularly relates to an in-phase SOC balance control method, a control device, an energy storage system and a medium. Background The energy storage unit is a system for storing and releasing electric energy, and aims to balance power supply and demand and improve the stability of a power grid. The three-phase energy storage battery module is an important component of the energy storage unit, each phase energy storage battery module is composed of a plurality of energy storage battery packs, and each phase energy storage battery module is used for processing one phase of current in three-phase currents of the power system. After the energy storage unit is operated for a period of time, the states of Charge (SOC) of the plurality of energy storage battery packs in the phases of the three-phase energy storage battery module are liable to be unbalanced for various reasons. At present, under the condition that the in-phase SOC of the three-phase energy storage battery module is unbalanced in the operation process of the energy storage unit, a short-plate effect easily occurs in the operation process of the energy storage unit, so that the energy efficiency utilization rate of the energy storage unit is lower. Disclosure of Invention In view of the above, the embodiments of the present application provide a method, a device, an energy storage system and a medium for controlling in-phase SOC equalization, 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 in-phase SOC equalization, including: Under the condition that three-phase energy storage battery modules of the energy storage unit are in an operating state, determining whether the in-phase SOC of a target phase energy storage battery module is balanced, wherein the target phase energy storage battery module is at least one phase energy storage battery module in the three-phase energy storage battery modules; Under the condition that the in-phase SOC of the target phase energy storage battery module is unbalanced, determining an energy storage battery pack to be processed from a plurality of target energy storage battery packs of the target phase energy storage battery module according to the preset redundancy quantity of the target phase energy storage battery module; Controlling the energy storage battery pack to be processed to be switched from an operation state to a hot standby state; And under the condition that the in-phase SOC of the target phase energy storage battery module is determined to be balanced, controlling the energy storage battery pack to be processed to be switched from the hot standby state to the running state. According to the scheme provided by the application, in the operation process of the energy storage unit, under the condition that the in-phase SOC of the three-phase energy storage battery module of the energy storage unit is unbalanced, the energy storage battery pack is controlled to temporarily exit the operation according to the preset redundancy quantity until the in-phase SOC of the three-phase energy storage battery module is balanced, the operation of the energy storage battery pack which has temporarily exited the operation is restored, the occurrence of a short-circuit effect can be restrained, and the energy efficiency utilization rate of the energy storage unit is improved. Wherein in some alternative embodiments, determining the to-be-processed energy storage battery pack from the plurality of target energy storage battery packs of the target phase energy storage battery module according to the preset redundancy number of the target phase energy storage battery module comprises: And sequentially selecting target energy storage battery packs with preset redundancy number from the target phase energy storage battery modules according to the SOC size sequence of each target energy storage battery pack in the target phase energy storage battery modules to obtain the energy storage battery packs to be processed. According to the scheme provided by the embodiment, the to-be-processed energy storage battery pack is determined based on the SOC size sequence and the preset redundancy number of the target phase energy storage battery module, so that the in-phase SOC of the three-phase energy storage battery module can be balanced under the condition that the to-be-processed energy storage battery pack temporarily exits from operation, and the control success rate of balanced control of the in-phase SOC of the three-phase energy storage battery module can be improved. In some optional embodiments, the operation state is a discharging state, and according to the SOC size sequence of each target energy storage battery pack in the target phase energy storage bat