Research on Internal Overvoltage and Insulation Coordination of Offshore Wind Power with Flexible and Direct Grid Connection

Under the flexible DC grid connected mode, the wind power output will have a great impact on the overvoltage transient characteristics under typical operation and fault conditions. It is introduced that the topology structure and typical fault conditions of offshore wind power flexible direct grid connected system. the maximum overvoltage level at the key position of the system is obtained based on PSCAD software, and the decisive fault condition of overvoltage is proposed. The insulation level of key equipment of offshore wind power flexible DC grid connection system is given, which can provide a theoretical reference for the design and insulation coordination of offshore wind power system.