earticle

영어

This work presents the comparison of various multicarrier based Pulse Width Modulation (PWM) techniques for the chosen single phase CMLI (Cascaded Multi Level Inverter). In this paper, a single phase symmetrical cascaded multilevel inverter is controlled with sinusoidal, THI (Third Harmonic Injection), Trapezoidal, TAR (Trapezoidal Amalgamated Reference) and Stepped Wave reference with Equal Amplitude Carriers (EAC) and UEAC (Un Equal Amplitude Carriers). The proposed EAC and UEAC are applied for various PWM strategies. The PWM methods used for the analysis are PD (Phase Disposition) PWM, POD (Phase Opposition and Disposition) PWM, APOD (Alternative Phase Opposition and Disposition) PWM, CO (Carrier Overlapping) PWM, PS (Phase Shift) PWM and VF (Variable Frequency) PWM with EAC and UEAC. For all the PWM methods and references the UEAC produces less THD and higher fundamental RMS (Root Mean Square) values except for ma =1. For ma =1 the EAC provides less THD (Total Harmonic Distortion) and higher fundamental RMS (Root Mean Square) values for all the PWM methods and references. To validate the developed technique, simulations are carried out through MATLAB/SIMULINK.