The study of a Wind Energy Conversion System (WECS) based on Permanent Magnet Synchronous Generator and interconnected to the electric network is described. The effectiveness of the WECS can be greatly improved, under Grid Fault, by using an appropriate control. So, the control strategy combines Maximum Power Point Tracking (MPPT) and a pitch control scheme to maximize the generated power. Consequently, WECS can not only capture the maximum wind energy, however it can also maintain the frequency and amplitude of the output voltage. Simulation results have shown the effectiveness of the proposed control strategy for WECS based on the PMSG

With the advance of power electronic technology, novel control strategies and new circuit topologies direct driven permanent magnet synchronous generators (PMSG) have increasingly drawn interests to wind turbine manufactures. In the proposed wind energy system, a PMSG is used as a variable speed generator. The generator model is established in the synchronous-rotating dq reference frame. The torque of PMSG is suitably controlled according to a generator speed and thus the power from a wind turbine settles down on the maximum power point by the proposed MPPT control without a wind speed detector. The speed control is realized through field orientation where the q-axis current is used to control the rotational speed of the generator according to the variation of wind speed and the d-axis current is set to zero. Active and reactive power can be controlled by direct and quadrature current components, respectively.