一种基于电压反馈控制的配电网短路故障柔性限流方法

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Abstract The short circuit current can be limited quickly after being detected in the incipient stage of short circuit fault,in this case,the operation safety of power system can be ensured.In this paper,the area surrounded by current half-cycle curve and the time axis is taken as the criterion of early detection on short circuit fault.Combining the characteristics of distribution network short circuit fault with the output features of cascaded H-bridge converter,a method based on three single-phase cascaded H-bridge multi-level converters is proposed in flexible short-current limiting.These converters are connected to the grid via coupled capacitors.The voltage signal is selected as the feedback so that the converters can generate output voltage to achieve the goal of limiting fault current using an appropriate control method.The simulation results show that based on the early detection,the proposed method can suppress the first peak value of the fault current to mitigate the harms and relieve the burden of circuit breaker.In addition,the selection of faulty phases is unnecessary.

Key words： Distribution network short circuit fault early detection flexible current limiting cascaded H-bridge converter

Received: 22 May 2016 Published: 20 June 2017

PACS:

TM713

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	Articles by authors
	Guo Moufa
	You Linxu
	Wei Xiaoying
	Gao Wei
	Yang Gengjie

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Guo Moufa,You Linxu,Wei Xiaoying等. A Flexible Current Limiting Method of Distribution Network Short Circuit Fault Based on the Voltage Feedback Control[J]. Transactions of China Electrotechnical Society, 2017, 32(11): 48-56.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I11/48

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