Simulation Study of Cascade H-bridge Multilevel Inverter 7-Level Inverter by SHE Technique

Abstract

In this Paper, fuzzy logic approach is implemented as a switching technique. The traditional logic gate design is eliminated by using the proposed technique. There is a pulse generator which is designed by fuzzy logic acts as a pulse generator and a look-up table also. An input is based on a modulation index, well controlled membership functions used and the related fuzzy logic controller’s rules can be used to produce pulses directly without using any extra block. The mentioned technique is being implemented by using the cascaded multilevel H-Bridge inverter with symmetric operation using pulse width modulation with selective harmonic elimination technique (SHE-PWM). MFs are designed as per the calculated firing angles for various modulation index.