Abstract
Adaptive reclosing capable of identifying fault properties and arc extinction time can make up for the blindness defects of traditional auto-reclosing. Research on adaptive reclosing is necessary to quickly restore power supply and improve power system stability. At first, fault characteristics are divided into different fault stages. The characteristics of faulty pole voltage under different fault stages are derived. Then, an integral ratio algorithm is used to extract the characteristic differences of faulty pole voltage. After the transient fault arc is extinguished, the integral ratio will always exceed threshold within a cycle judgment time. Finally, different arc extinction times are simulated by the arc model. An adaptive reclosing scheme for true bipolar flexible high voltage direct current (HVDC) systems is proposed. The scheme can withstand the influence of arc combustion time, fault location, transition resistance, and noise. The performance of the proposed scheme has been verified via the simulation results obtained from PSCAD/EMTDC.
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