Volume : VII, Issue : XII, December - 2018

A NOVEL MULTILEVEL INVERTER WITH REDUCED NUMBER OF SWITCHES

Revathy. R, Suganya. R, Preetha. R

Abstract :

 This paper presents the comparison of various Pulse Width Modulation (COPWM) Strategies for the chosen three phase Cascaded Multi Level Inverter (CMLI). Various new schemes adopting the constant switching frequency and also variable switching frequency multicarrier control freedom degree combination concepts are developed and simulated for the chosen three phase CMLI. The three phase CMLI is controlled in this paper with Sinusoidal PWM (SPWM) reference along with Carrier Overlapping (CO) techniques and simulation is performed using MATLAB-SIMULINK. The variation of fundamental RMS output voltage and total harmonic distortion is observed for various carrier overlapping techniques. Among the various equal amplitude carrier overlapping techniques such as COPWMA, COPWMB, COPWMC, and COPWMD, it is observed that COPWMC provides less Total Harmonic Distortion (THD) and COPWMD provides relatively higher RMS voltage. Among the various Variable Amplitude COPWM (VACOPWM) techniques, such as VACOPWMA, VACOPWMB, VACOPWMC, and VACOPWMD, it is inferred that VACOPWMC provides less THD and VACOPWMB provides higher RMS voltage. It I also found that VACOPWM strategies perform better than corresponding COPWM strategies.

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Article: Download PDF    DOI : https://www.doi.org/10.36106/gjra  

Cite This Article:

A NOVEL MULTILEVEL INVERTER WITH REDUCED NUMBER OF SWITCHES , Revathy.R, Suganya.R, Preetha.R , GLOBAL JOURNAL FOR RESEARCH ANALYSIS : Volume-7| Issue-12 | December-2018

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