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Overvoltage Simulation Research of UHVDC Transmission Converter Caused by Upper Converter Midpoint Bus Grounding Fault

Based on the parameters of the equipment of Xiangjiaba-Shanghai ±800kV UHVDC transmission project, the power system simulation model is established in this paper. Generation mechanism and distribution law of operating overvoltage is analyzed, which is caused by upper converter unit midpoint bus grounding fault. On the basis of simulation results, the effects of protection delay and fault location on overvoltage are analyzed separately. This study has certain guiding significance for the following arrester configuration optimization in UHVDC project.