Optimal PWM strategy for 11-level series connected multilevel converter using Hybrid PV/FC/BESS source

Abstract

Most of the Multilevel converters are operated under the switching strategy based on fundamental frequency (each switch goes to turn on and off per output cycle, with the equivalent of pulses), with respective switching angles achieves the low value of output THD and it is nothing but optimal THD minimization strategy. Here we preferred H-bridge multilevel converter topology based on a cascaded connection of a high-voltage converter is interfaced for pv/fuel cell based grid connected/standalone AC power system applications. This paper evaluates a new breed of multi carrier modulation scheme is known as wave shift (hybrid) multi carrier modulation, is used to valuation of proposed cascade multilevel converter (CMC). By using the proposed optimal switching scheme provides low amount of total harmonic distortion (THD) in output voltage compared to conventional switching schemes such as phase shift (PSHM) and level shift (LSHM) modulation scheme and simulation circuit of nine and seven levels for proposed multilevel converter is designed. A Simulation study & comparative analysis has been carried out to present high performance of the proposed scheme to approach a very low total harmonic distortion of voltage which leads to the possible elimination of the output filter using Matlab/Simulink Platform.