Design of Z source inverter based VSWECS with improved PWM Control

Abstract

With rapid development in Wind Energy Conversion Systems (WECS), various methods have been used to increase power generation from wind. In order to reach voltage gain as maximum in a variable speed WECS, an improved PWM method through varying shoot through time for Impedance source inverter is implemented in this paper. For a given modulation index, the correlation of voltage gain with capacitor voltage, and the device stress are analyzed in detail. For 'various shoot through time,the simulation results of voltage across capacitor, current through inductor,output current and output voltage are obtained by using Simpower system tool in MATLAB/ Simulink and compared. The results have been confirmed for the developed experimental model.