A Grid Connected Cascaded H-Bridge Multilevel Inverter Based Wind Energy System Addressed with the Problem of Power Mismatch in Isolated DC Links

This paper propose an improved control scheme which addresses the DC link capacitor unbalancing and a PWM generation scheme and a PWM scheme to operate the converter under the condition of unequal power generation from two different wind energy system. Wind speed is the external factor that determines the power output of wind energy system. When two or more wind energy system cascaded, and the wind speed for both is different, This creates unequal power generation from both the wind energy system, which results in DC link capacitor unbalancing. Thus in this paper, the problems of capacitor unbalancing is resolved and current is injected to the grid with improved Power Quality (PQ). MATLAB model of the Cascaded H-Bridge (CHB) five-level Inverter topology is simulated and results are provided).