Design of Reduced Device Count Multilevel Inverter by Using Multicarrier PWM Techniques

Abstract

The world is moving towards renewable power generation. In this regard solar PV panels are being widely adopted for power producing. Since an interface is always needed whenever there is mismatch between supply and load. Although conventionally inverters are available, but their output is not pure sinusoidal and contains certain harmonics. Multilevel inverters provide output waveform better than conventional inverter by producing number of levels of output voltage. But as the number of output levels are increased, the number of switching devices and voltage sources. This gap is filled by using reduced-device count MLI topologies. So RDC MLIs are trend in trend in the research era of power electronics. The beauty of PWM control makes it more attractive for an effective power conversion. In this project a 7-level RDC MLI is designed. The circuit contains separate parts for both level and polarity generation. The proper combination of logic gates is employed for generating the switching signals for 8 IGBTs from 6 high frequency carrier signals. The carriers have switching frequency of 1.5 kHz and reference sine wave is compared the signals are generated. This whole work is done on MATLAB- SIMULINK software.