Modeling of Five-Level Inverter for Renewable Power Source

Abstract

In this paper we proposed better solution for designing five-level inverter by injecting small amount of real power from the renewable power source  into  the  grid  to  consistently reduce the switching power loss, the harmonic distortion in it, and EMI in power electronic devices caused by switching operation. In order to construct we require  2  dc  capacitors,  full-bridge inverter,  a dual buck converter and filter. Here role of dual- buck  converter  is  to  converts  2  dc  capacitor voltage sources to a dc output voltage with three levels and that balances these 2 dc capacitor voltages, thus output voltage of dual-buck converter supplies to full-bridge inverter. Finally it is designed toproduce output current controlled to  generate a  sinusoidal current  in phase with utility voltage to inject to grid. We also simulated results with Matlab Simulink and studied power decoupling performance.