Space vector pulse width modulation control techniques for a five-phase quasi-impedance source inverter

Abstract

This study proposes space vector modulation (SVM) techniques for a five-phase quasi-impedance source inverter. Five different SVM methods are elaborated utilising four active neighbouring (from two different lengths group) and a zero space vector to synthesise the reference voltage with the aim of obtaining sinusoidal output voltage waveforms. The main objective of the developed SVM methods is to reduce total harmonic distortion (THD) in the output voltage waveform while simultaneously boosting the DC link voltage. Shoot-though period is computed according to the required boost in the DC voltage and spread in a switching cycle. Five different schemes are developed based on the shoot-through application in a number of inverter legs. A comprehensive comparative study of the proposed SVM techniques is carried out based on various obtained characteristics such as the shoot-through duty ratio, boost factor, voltage gain, THD and efficiency. Theoretical analysis and simulation results are validated using experimental approach.