Power Inverter Performance with Trapezoidal Triangular Carrier and Triangular Based SPWM Technique: A Comparative Analysis

Output voltage quality and efficiency of multilevel inverters vastly depend on the modulation technique employed. However, the performance of high frequency modulation technique depends on the type of carrier signal, modulating, as well as modulation index. Identification of the best modulation strategy it can reduce voltage and current THDs, as well as power losses. This paper presents a comparative analysis between trapezoidal triangular carrier and triangular carrier based SPWM on the performances of a power converter. The study investigates the effects of varying the modulation index and carrier frequency, and identifies optimal points where the trapezoidal triangular carrier signal-based SPWM technique demonstrates superior performance. Additionally, the power losses of this carrier signal have been compared to that of the conventional carrier based SPWM modulation approach. The comprehensive study has been conducted using the MATLAB Simulink software. The simulation findings indicate that though the trapezoidal triangle carrier based SPWM technique exhibits lower voltage total harmonic distortions (THDs) compared to the conventional technique, its produces high current total harmonics distortions for the same resistive inductive load and high inverter losses.