Control strategy of high power converters with synchronous generator characteristics for PMSG-based wind power application

A virtual synchronous generator (VSG) control for high power permanent magnetic synchronous generators (PMSG) in wind power generation is investigated in this paper. A power factor correction (PFC) rectifier for each phase of the PMSG is designed to transform variable voltage and frequency of wind power into constant voltage DC power. The PFC boost inductor is replaced by a PMSG armature inductance to reduce the size and cost of the overall system. A three-phase inverter is used as a power interface to feed the generated wind power to the grid or load. By designing an excitation controller and a prime motor controller, the PMSG-based wind power interface can mimic a self-stabilization characteristic of synchronous generator which has rotor inertia, thus helping to improve the stability of wind power generation. Experimental results of the VSG inertia performance are illustrated, and the simulation results of traditional PQ and proposed VSG control are given and compared to validate the proposed converter topology and control algorithm.