Fault-tolerant control strategy for modular multi-level hybrid converter battery energy storage system

doi:10.19799/j.cnki.2095-4239.2021.0482

Abstract

Abstract:

Battery energy storage system based on modular multilevel converter (MMHC-BESS) is suitable for medium and low voltage power grid, which is conducive to solve the problem of renewable energy grid connection. But as the number of sub-modules increases, the reliability of the system is facing great challenges. To enhance the fault-tolerant operation capability of energy storage systems, aiming at the unbalanced operation state of sub module fault, a fault-tolerant control strategy without hardware redundancy is proposed. Based on carrier phase-shift modulation algorithm, the line voltage balance and grid connected power are maintained by modulation signal reconstruction algorithm. In addition, in order to improve the utilization rate of energy storage battery capacity, a SOC equalization strategy based on fault-tolerant control is proposed. Through zero-sequence voltage injection and dynamic adjustment of in-phase SOC equalization factors, an inter-phase and in-phase two-stage SOC equalization strategy is constructed. Finally, a simulation model based on PLECS is built to verify the feasibility and effectiveness of the proposed strategy.

Key words: MMHC, fault-tolerant control, battery energy storage system, state of charge (SOC)

CLC Number:

TM 46

Feng TIAN, Zhijiang CHENG, Handi YANG, Tianxiang YANG. Fault-tolerant control strategy for modular multi-level hybrid converter battery energy storage system[J]. Energy Storage Science and Technology, 2022, 11(5): 1583-1591.

Figures/Tables 19

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参数	数值
交流电网电压峰值	311 V
并网功率	24 kW
网侧电感	1 mH
并网等效电阻	0.1 Ω
桥臂子模块数	6个
储能电池模块额定容量	0.3 Ah
子模块直流电容储能电池模块额定电压	475 uF 64 V
开关频率	10 kHz

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