Performance analysis of single stage standalone PV fed novel three level inverter

Abstract

This paper presents a novel design for photovoltaic supply system fed multilevel inverter; the proposed MLI topology is needed only 12 switches and no extra clamping devices required unlike others MLI's; which make it unique and suitable modulation technique provide the reliable single stage conversion with PV system. The modulation technique used is for tracking maximum power point and also to converts dc from PV to ac for a resistive load. The sinusoidal level shift PWM method is used to generate the switching pulses for the MLI while modulation index for switching of MLI is controlled by incremental conductance algorithm. The proposed topology is compared with three well known basic MLI topologies on the basis of component used. As compared to generally used two stage conversion techniques this single stage system is having higher efficiency; reliability and reduced cost. The complete system is developed and tested on MATLAB/Simulink.