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This article analyzes the applicability of AC line phase selection components in the context of large-scale offshore wind farms through multi-terminal flexible direct transmission. When the AC line fails, the converter station adopts a control strategy to suppress negative sequence and only outputs positive sequence current, resulting The positive and negative sequence current distribution coefficients on the converter station side are seriously unequal; This leads to adaptability problems of traditional protection phase selection components, which may cause incorrect actions of reclosing, protection ranging and distance protection. The simulation results based on RTDS verify the correctness of the theoretical analysis.

Analysis on the Applicability of Phase Selection Components of Inverter Power Supply Transmission Line