A novel single phase multilevel inverter with single photovoltaic source and less number of switches

In this paper a novel single phase multilevel inverter with single photovoltaic (PV) source and less number of switches is proposed. Photovoltaic based high power applications needs a multilevel inverter (MLI) with multiple sources to convert DC to AC. Conventional multilevel inverters required large number of capacitors, diodes, power switches and input sources. In order to overcome this drawback, proposed single phase MLI can be employed. Proposed MLI have single source and less number of switches, diodes and capacitors. Thus proposed MLI reduces the complexity of circuit design. In this paper, 9-Level MLI is proposed for photovoltaic applications with level shifting SPWM (sinusoidal pulse width modulation) technique. Proposed 9-level MLI is designed with rated power 2KW, 0.8 modulation index, 60V input supply. Total harmonic distortion (THD) of 9-level output voltage with LC filter and without LC filter is 4.56% and 17.29% respectively. The simulation results confirm the operation of proposed 9-level MLI and simulation is carried out in MATLAB/SIMULINK.