Abstract
Direct DC transmission technology will become an effective solution for large offshore wind power system. This paper presents a Non-isolated MMC DC converter, which can be used for direct gathering and transmission of offshore wind power system. The topology structure can be connected to the HVDC grid with high voltage difference at low cost. The bipolar design meets the transmission needs of wind power system. The multiphase interleaving topology can inhibit the ripple of input current and output voltage, and its fault-tolerant operation control method meets the deep sea low maintenance level design needs. Based on the new topology, the phase shift modulation law and one-way power flow control scheme under multi working conditions are studied. Based on MATLAB/Simulink, the simulation analysis of the topology is carried out for steady state, dynamic and short circuit faults. Finally, a prototype system is built to verify the correctness of the theoretical analysis.
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