Current total harmonic reduction technique on three-level single phase transformerless photovoltaic inverter using PSpice

Abstract

This paper presents simulation of three-level single phase transformerless photovoltaic inverter (TPVI). Proposed technique of the simulation is created in PSpice software. The simulation is constructed by two voltage controlled switches, ETABLE and EVALUE block diagram. The voltage controlled switches produce two pulse waves with difference time delay which influence maximum voltage angle and current total harmonic distortion (CTHD). These two voltage pulse waves are changed become three-level AC waveform by ETABLE block with magnitude of 1 V and increased by EVALUE block which following value of photovoltaic array voltage. The output of EVALUE block is connected to AC loads. Resistive load of 30 W lamp and inductive load of 20 W water pump are applied to the TPVI. The result shows that maximum voltage angle which is varied from 200 to 1800 influences the CTHD, the lowest CTHD of 11.75% is obtained when the maximum voltage angle is 1250.