Health State Equalization Control Strategy for Multi-battery Clusters in Energy Storage Systems

doi:10.11930/j.issn.1004-9649.202401124

Abstract

Abstract:

To address the issue of health state equalization among multiple battery clusters in energy storage systems, this paper designs a multi-battery cluster health state equalization control strategy for the energy storage system. This strategy sets the minimum grid-connected power limit for the storage converter according to the change rule of battery life and the grid connection requirements and determines the number of storage converter units involved in the operation of the system based on this limit. Furthermore, the hierarchical analysis method is combined to evaluate the health state of the various clusters of batteries involved in the operation and quantify the value to get the weight coefficients and corresponding power sizes of the storage converter to assume the grid-connected power command. The number of participating energy storage converters and the transmitted power are adjusted to ensure that the power of each energy storage converter does not exceed the limit. Compared with the equalization control strategy, the proposed control strategy can effectively equalize the health state of each battery cluster, extending the overall service life of the energy storage power plant by 40.6% and effectively improving the safety and economy of the energy storage power plant.

Key words: energy storage system, battery life change rule, energy storage converter, hierarchical analysis method, safety, economy

Hao PENG, Zhengjing LUO, Xiangyang XIA, Gang ZENG, Yujian OU, Guiquan CHEN, Jijun WANG, Lihong LIU. Health State Equalization Control Strategy for Multi-battery Clusters in Energy Storage Systems[J]. Electric Power, 2024, 57(6): 45-52.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202401124

https://www.electricpower.com.cn/EN/Y2024/V57/I6/45

Figures/Tables 11

References 28

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	S_OH1	S_OH2	···	S_OHm
S_OH1	1	a₁₂	···	a_1m
S_OH2	a₂₁	1	···	a_2m
$\vdots $	$\vdots $	$\vdots $	$\ddots $	$\vdots $
S_OHm	a_m1	a_m2	···	1

	S_OH1	S_OH2	···	S_OHm
S_OH1	1	a₁₂	···	a_1m
S_OH2	a₂₁	1	···	a_2m
$\vdots $	$\vdots $	$\vdots $	$\ddots $	$\vdots $
S_OHm	a_m1	a_m2	···	1

参数		数值
储能系统直流侧电压/V		800
电网电压/V		380
储能系统交流侧电感/mH		21
单台PCS额定运行功率/kW		15
单台PCS转换功率下限/kW		6
S_OH1/%		98
S_OH2/%		94
S_OH3/%		92
S_OH4/%		90

参数		数值
储能系统直流侧电压/V		800
电网电压/V		380
储能系统交流侧电感/mH		21
单台PCS额定运行功率/kW		15
单台PCS转换功率下限/kW		6
S_OH1/%		98
S_OH2/%		94
S_OH3/%		92
S_OH4/%		90

因素i比因素j		量化值
同等重要		1
稍微重要		3
较强重要		5
强烈重要		7
极端重要		9
两相邻判断的中间值		2，4，6，8