交直流并联系统中三相重合时序对距离保护动作特性的影响

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Abstract Significant effect of three-phase reclosure sequence on distance protection in AC-DC system has been discovered.AC and DC parallel system model is established,expression of measuring impedance on perfect line’s both sides is deduced under different reclosure sequences when AC transmission line symmetry fault occured.Hereby,the critical analysis of the impact of distance protection characteristics of fault distance,and to explore the measuring impedance with the rectifier and inverter system variation of the reactance.Commutation failure in DC system,the relationships among DC system’s equivalent impedance with fault voltage component and fire angle are derived.According to the expression,analyzing on the variation trend of the perfect line’s measured impedance along with the fire angle and fault voltage component,and obtain the best reclosure sequence method that decreases the risk of distance protection’s maloperation in DC parallel system.Simulation results of two-area AC-DC series system verify the conclusions’ correctness and validity.

Key words： Three-phase reclosure sequence distance protection AC-DC parallel system maloperation

Received: 28 July 2015 Published: 19 January 2017

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	Sun Shiyun
	Shu Hongchun
	Han Junqiang
	Chen Chunmin

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Sun Shiyun,Shu Hongchun,Han Junqiang等. Influence of Three-Phase Reclosure Sequence on Distance Protection in AC-DC Parallel System[J]. Transactions of China Electrotechnical Society, 2017, 32(1): 32-39.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I1/32

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