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Investigations on Three Phase Five Level Flying Capacitor Multilevel ...

Investigations on Three Phase Five Level Flying Capacitor Multilevel ...

Investigations on Three Phase Five Level Flying Capacitor Multilevel

International Journal of Engineering and Technology Volume 2 No. 7, July, 2012 ong>Investigationsong> on Three Phase Five Level Flying Capacitor Multilevel Inverter C.R.Balamurugan 1 , S.P.Natarajan 2 ,R.Bensraj 3 1 Department of EEE, Arunai Engineering College,Tiruvannamalai, Tamilnadu, India 2 Department of EIE, Annamalai University, Chidambaram, Tamilnadu, India 3 Department of EEE, Annamalai University,Chidambaram, Tamilnadu, India ABSTRACT The use of multilevel inverters is widespread in medium voltage applications due to their inherent voltage sharing among the devices. This work proposes three phase five level Flying Capacitor Multilevel Inverter (FCMLI) using various modulating techniques for induction motor load. These Pulse Width Modulating (PWM) techniques include Carrier Overlapping (CO) strategy, Variable Frequency (VF) strategy, Phase Shift (PS) strategy and Sub-Harmonic Pulse Width Modulation (SHPWM) i.e. Phase Disposition (PD) strategy, Phase Opposition Disposition (POD) strategy and Alternate Phase Opposition Disposition (APOD) strategy. The Total Harmonic Distortion (THD), V RMS (fundamental), crest factor, form factor and distortion factor are evaluated for various modulation indices. Simulation is performed using MATLAB-SIMULINK. It is observed that PODPWM method provides output with relatively low distortion. COPWM is also found to perform better since it provides relatively higher fundamental RMS output voltage for Induction Motor (IM) load. Keywords: CF, FCMLI, FF, PWM , THD, V rms LIST OF ABBREVATIONS CF Crest Factor THD Total Harmonic Distortion FF Form Factor PD Phase Disposition POD Phase Opposition and Disposition APOD Alternate Phase Opposition and Disposition VF Variable Frequency PS Phase Shift FCMLI Flying Capacitor Multilevel Inverter SHPWM Sub Harmonic Pulse Width Modulation NC No Connection IM Induction Motor A c Amplitude of the Carrier A m Amplitude of the Reference f m Frequency of the Modulating Signal f c Frequency of the Carrier Signal m Number of Levels m a Amplitude Modulation index m f Frequency Modulation index Phase Voltage V an 1. INTRODUCTION Multilevel inverters offer a number od advantages when compared to the conventional two level inverter. The recent development of new power semiconductor technologies capable of handling higher voltage and current ratings has helped the consolidation of multilevel topologies in medium voltage drives. Janyavula and Saxena [1] made a detailed study on diode clamped multilevel inverter with respect to modulation index and control strategy. Urmila and Subbarayudu [2] also made a detailed study on pulse width modulation techniques. Natchpong et al [3] proposed a 6.6 KV transformer less motor drive using five level diode clamped inverter for ISSN: 2049-3444 © 2012 – IJET Publications UK. All rights reserved. 1131

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