Equalization Control Strategy for Series-connected Vanadium Redox Flow Batteries Based on LC Oscillation Circuit

LI Xin, MO Yan-qing, QIU Ya

Control Engineering of China ›› 2022, Vol. 29 ›› Issue (6) : 1098-1103.

Control Engineering of China ›› 2022, Vol. 29 ›› Issue (6) : 1098-1103.

Equalization Control Strategy for Series-connected Vanadium Redox Flow Batteries Based on LC Oscillation Circuit

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Abstract

In order to solve the problems of reduced battery capacity and shortened cycle life of seriesconnected vanadium redox flow batteries(S-VRBs) during operation, we propose an equalization control strategy based on LC oscillation circuit. This strategy uses capacitance and inductance to store energy, so that energy is transferred from a VRB with high SOC to a VRB with low SOC. In this paper, we study the effects of different parameters and switching frequency on equalization performance to select the appropriate parameters of the LC oscillation circuit, which is compared with a conventional capacitance type circuit. Then, battery model based on the LC oscillation circuit is simulated and analyzed under static condition, charging condition and discharge condition in the MATLAB/Simulink. The results show that the proposed strategy has fast equalization speed and high energy transfer efficiency. In the process of charging and discharging, the SOC of different VRBs tends to be consistent, and the voltage of S-VRBs can keep below a certain dispersion, which effectively improves battery utilization and system efficiency.

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Series-connected vanadium redox flow batteries / LC oscillation circuit / energy transfer / equalization control / charge-discharge

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LI Xin, MO Yan-qing, QIU Ya. Equalization Control Strategy for Series-connected Vanadium Redox Flow Batteries Based on LC Oscillation Circuit[J]. Control Engineering of China, 2022, 29(6): 1098-1103

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