含四桥臂H桥变流器的不对称配电网综合补偿方法

doi:10.19595/j.cnki.1000-6753.tces.210588

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Abstract In order to solve the problems of single function, low utilization rate, high cost and difficulty in coordination of power electronic equipment in the distribution network, a new comprehensive compensation method for unbalanced distribution network with four-arm H-bridge converter was proposed. A new topology structure of adding cascade H-bridge to ground branch at the neutral point of static var generator was proposed to provide circulation circuit for ground fault and parameter asymmetry compensation current. Considering the influence of unbalanced parameters of three phase to ground and unbalanced load in distribution network, the functions of active and reactive power compensation, three-phase unbalanced load compensation, unbalanced voltage suppression and ground fault current compensation were comprehensive into the same comprehensive compensation device. Based on the analysis of the principle and interaction mechanism of each function, the multi-objective cooperative control strategy based on sequence decoupling control, and the switching method of three-phase parameter unbalance suppression and ground fault current compensation were proposed. In normal operation, the comprehensive compensation device dynamically compensated active and reactive power of distribution network, suppresses three-phase unbalanced load and unbalanced voltage of three-phase parameters. In case of grounding fault, three-phase parameter unbalanced voltage suppression switched to ground fault current compensation. Simulation results verify the effectiveness of the proposed method.

Key words： Unbalanced distribution networks comprehensive compensation power compensation asymmetry compensation ground fault compensation four-arm H-bridge converter

Received: 27 April 2021

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TM726

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	You Jianzhang
	Guo Moufa

Cite this article:

You Jianzhang,Guo Moufa. Comprehensive Compensation Method for Asymmetric Distribution Network with Four-Arm H-Bridge Converter[J]. Transactions of China Electrotechnical Society, 2022, 37(11): 2849-2858.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.210588 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I11/2849

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