期刊名称：Journal of Theoretical and Applied Information Technology
印刷版ISSN：1992-8645
电子版ISSN：1817-3195
出版年度：2013
卷号：54
期号：2
出版社：Journal of Theoretical and Applied
摘要：This paper presents the comparison of various Carrier Overlapping 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 COPWM-1, COPWM-2, COPWM-3, and COPWM-4, it is observed that COPWM-3 provides less Total Harmonic Distortion (THD) and COPWM-4 provides relatively higher RMS voltage. Among the various Variable Amplitude COPWM (VACOPWM) techniques such as VACOPWM-1, VACOPWM-2, VACOPWM-3, and VACOPWM-4, it is inferred that VACOPWM-3 provides less THD and VACOPWM-2 and VACOPWM-3 provide higher RMS voltage. It also found that VACOPWM strategies perform better than corresponding COPWM strategies.
