V/f Control of Five-Phase Induction Motor Drive Fed from Cascaded H Bridge Multilevel Inverter

Abstract

A multilevel inverter has its own advantages over normal inverters for high voltage applications such as reduced harmonics, and better AC output. Multi-levels are realized by different techniques e.g. Flying capacitors, Neutral point clamp capacitor, Cascaded H-bridge, and Packed U-cell. In this paper, five-level voltage is modulated for five-phase induction motor drive. Multilevel inverters for multiphase drives has coalesced benefits of multilevel and multiphase, which makes the system an excellent solution for higher voltage applications. In this paper cascaded H-bridge inverter topology has been used for generating the five-level voltage output which is then fed to the five-phase drive and a volt/hertz control is applied for proper operation of the system. The machine is made to run at different load conditions and a satisfactory result is observed through simulation which ultimately verifies the suitability of the control and modulation.