A kind of direct-driven WECS using single-switch three-phase Boost rectifier

Direct-driven wind power generation system has been receiving increasing attention due to its inherent advantage. To realize variable speed operation of the PMSG WECS, a conventional three-phase bridge rectifier with bulky capacitance associated with voltage source current controlled inverter is usually used, which will introduce high intensity low frequency current harmonics into the PMSG and consequently increase the total losses. In order to solve such problem, a single-switch three-phase boost PFC rectifier with interleaved operation is applied, although the current of each branch is at DCM mode, the combined line current is at CCM mode. And the modulation method with carrier phase-shifted (CPS) is used to control the different branches of the converter. Using the topology and control method can correct the power factor of the PMSG without increasing the system cost, decrease the current harmonic contents, and increase the real power output ability and the overall system efficiency. Simulation and experiment results verify the validity of the topology and its control principle adopted.