Voltage-Fed Isolated Matrix-Type AC-DC Converter for Wind Energy Conversion System

In this project, a voltage-fed isolated matrix type ac/dc converter (VF-MC) is proposed for wind energy conversion system (WECS). Instead of the line-frequency transformer, the high-frequency transformer (HFT) is used for isolation between the generator and the grid. The direct matrix converter (MC) is employed to connect the wind power generator and the HFT, and the intermediate dc capacitors are saved in the ac/ac conversion. Moreover, the proposed VF-MC can work without use of filter capacitors on generator side, and enable more compact size. The dedicated space-vector-modulation scheme and commutation method are proposed for safe operation of the MC. The voltage spikes due to the leakage inductance of HFT are thus reduced and the additional snubber circuit is avoided in the proposed system. The simulation results can be evaluated by using Matlab/Simulink Software.

Keywords: Matrix converter (MC), soft switching, space vector modulation (SVM), wind energy conversion system (WECS).