DC distribution power network has bigger power supply capacity, fewer distribution loss and more flexible topology structures when compared to AC distribution network. Permanent magnet direct drive wind turbine can work well without the gear box and electric brush that has a lower cost and lower maintenance cost. So there has a certain market potential and research value when the PMSM running together with the DC grid connection. Based on the PMSM’ s mathematical model and the conventional control strategy, a sub-control strategy is proposed that can ensure a smooth transition during the start and stop operation for the PMSM wind turbine system. Simulation tests are built on the RTDS’ s micro second-level module, and the simulation results demonstrate that the start/stop control strategy is effective.