A Single Stage 1 Switched Capacitor 7S-7L using Different PWM Topologies for Harmonics Reduction

Abstract

Abstract Design and analysis of single-stage 1 Switched Capacitor (SC) boost 7Switch 7-Level (7S-7L) inverter for attaining higher voltage levels with reduced switches count using various PWM techniques is presented. PD, POD, APOD, VF, and CO is different PWM techniques which used to control the switches in the SC circuit. The main objective of this analysis is to reduce the existing drawbacks as increased switches count, high % of Total Harmonic Distortion (THD), and typical PWM control method. Single-stage SC-based boost converter topology in Multi-Level Inverter (MLI) that resolves the existing problem. Single source, two capacitors, and the voltage gain ratio of 4 are attained from the presented topology without the transformer. Furthermore, comparisons are made between the existing parameters such as THD value, voltage levels, and proposed THD, voltage levels with different PWM techniques. SC-based 7L inverter is implemented, in order to compare the performance of proposed better than the existing 5-level MLI and 5-level SC-MLI inverter, and THD is compared with various PWM techniques and 0.9 modulation index. The performance of the proposed method is validated through the simulation results using MATLAB/Simulink.