Simple maximum power extraction control for permanent magnet synchronous generator based wind energy conversion system

A new and simple maximum power extraction control strategy is proposed for the permanent magnet synchronous generator (PMSG) based variable speed wind energy conversion system (VSWECS). The PMSG is connected to the grid through a switch mode rectifier and a three phase voltage source (VSI) inverter. The generator side switch mode rectifier is controlled to achieve maximum power from wind. Simple estimating of PMSG generator speed, using estimated generator speed to calculate mechanical power generated from wind, and optimum power coefficient can be achieved from the relation governed the generator speed and mechanical power. The grid side voltage source inverter uses a hysteresis current controller to supply power at unity power factor into the grid. Extensive simulations have been performed using MATALB/SIMULINK. Simulation results show that the controller can extract maximum power from the wind and achieve unity power factor at the grid with different wind speed.