Simulation Study and Comparison of Simplified Single-Phase Multilevel Inverter and CCHB Inverter for Distributed Energy Resources

This paper is a simulation study of single phase multilevel inverter for distributed energy resources (DER).The DER system are small power generation tools which is used in microgride system, in order to reduce the conversion losses and to improve the size and cost of the system. The objective of this paper is to study the simplified single phase five level inverter topology, in this study a high step up converter is used to set up the voltage coming from the various DER's such as fuel cell module and photovoltaic module, this high voltage are acting as input to the inverter. The simplified five level inverter requires less number of switches as compare to conventional cascade H-bridge (CCHB) inverter. There are some strong advantages of this studied multilevel inverter such as improved output waveform ,lower Total Harmonic Distortion(THD) in addition of this two power switches are operated at the line frequency. The circuit has been designed and simulated with 18V input, 180V output as a part of photovoltaic AC module.