Research on the complex vector control strategy for MW level permanent magnet synchronous wind-driven generator

Aimed at the application of directly driven PMSG (Permanent Magnet Synchronous Generator) in MW wind power system, a strategy of compound vector control with the orientation at the direction of stator current is proposed in this paper. This strategy adopts the MTCRC (Maximum Torque / Current Ratio Control) mode to perform normal power generation within the range between the cut-in speed and a turning speed of the generator, but uses the WFC (Weakening Flux Control) to keep the system stability and safety, meanwhile generate as much as possible the power while the speed climbs into the range between the turning speed and the turbine´s limit. The two control modes may switch to each other according to the real time status of the system, and the feasibility of the proposed strategy is verified by simulation and experiments.