Comparative Study of Total Harmonic Distortionin VSI and Matrix Converter based WECS

This paper presents comparative study of Total Harmonic Distortion (THD) and its individual harmonic contents without grid and with grid for two level converter or voltage source Inverter and Matrix converter based Doubly Fed Induction Generator (DFIG) employing PI and Fuzzy logic controller (FLC). A simple method to control for a variable speed wind energy conversion system with a DFIG is connected to the grid through a diode rectifier and a voltage source inverter. The DC-link voltage is controlled through a DC-DC boost converter to keep the DC voltage at constant value. Inverter is controlled by sinusoidal pulse width modulation technique, which supplies power to the grid. The THD and its harmonic content are studied. Next the generator is connected directly to the grid through a Matrix Converter (MC). The Space Vector Modulation (SVM) technique is applied and studied. Simulation results have been performed using MATLAB/SIMULINK. The THD and its individual harmonic contents are studied and compared.