Study on Statistical Characteristics of Battery Consistency in Large-scale Energy Storage Power Stations

doi:10.12096/j.2096-4528.pgt.20063

Abstract

Abstract:

In the long-term operation of MW-level energy storage power stations composed of series and parallel connections, the inconsistency of battery cells will occur. Because the variation characteristics of voltage and temperature can directly reflect the inconsistency between battery cells in energy storage power station, the statistical characteristics of battery cell consistency in energy storage power station were analyzed by using extreme difference voltage, accumulated extreme difference voltage, voltage standard deviation, extreme difference temperature, accumulated extreme difference temperature of energy storage battery. By analyzing the statistical characteristics of the consistency of battery cells on a long-term scale, combined with the on-site operating status of energy storage battery, abnormal battery cells can be found in time, which can provide data support for the health assessment of energy storage power station, and reduce the systematic operation risk of energy storage power station.

Key words: energy storage power station, battery cell, consistency, extreme difference voltage

CLC Number:

TK02
TM912

Wentao JIN, Xiangjun LI, Dong HUI, Jingli LI, Wannian QI, Chengyuan Lü. Study on Statistical Characteristics of Battery Consistency in Large-scale Energy Storage Power Stations[J]. Power Generation Technology, 2021, 42(3): 298-305.

Figures/Tables 16

Fig.1 Topological structure of energy storage power station system

Fig.2 DC voltage, current and equivalent power curves

Fig.3 SOC curve of energy storage power station

Fig.4 Voltage curves of battery cell on typical day

参数	SOC/%
参数	15.2	15.2~100 (充电)	100 (静置)	100~15 (放电)	15 (静置)
最大值	3.231 0	3.399 0	3.345 6	3.190 0	3.234 1
平均值	3.224 4	3.374 8	3.343 0	3.182 2	3.229 0
最小值	3.218 0	3.384 0	3.339 7	3.166 0	3.221 2

Fig.5 DC voltage and current curves

Fig.6 Voltage curves of each battery cell

Fig.7 Extreme difference voltage curves of each battery cell

Fig.8 ID number of two battery cells for maximum and minimum voltage

Fig.9 Frequency statistics of maximum and minimum voltage corresponding to each battery cell

Fig.10 Accumulated extreme difference voltage curve of each battery cell

Fig.11 Voltage standard deviation curve of each battery cell

Fig.12 Temperature curves of each collection point

Fig.13 Extreme difference temperature curve of each collection point

Fig.14 Maximum, average and minimum temperature of each collection point

Fig.15 Accumulated extreme difference temperature curve of each collection point

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