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.
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2017, Vol. 32 
