Design, Simulation and Comparison of Three-phase Symmetrical Hybrid Sinusoidal PWM fed Inverter with Different PWM Techniques

摘要

PWM technique can reduce switching and harmonic losses of the inverter. Hybrid PWM inverter utilizes half of the switches to operate at low-frequency signal and the other half of the switches to operate at high-frequency signal to reduce switching loss. But switching loss and heat dissipation among switches are uneven which reduces system reliability. Three-phase symmetrical hybrid sinusoidal PWM inverter is proposed where all switches operate at low and high-frequency signals alternatively which removes unequal switching loss and heat dissipation between switches. Switching loss, heat dissipation and total harmonic distortion of SHSPWM inverter don’t vary from HPWM. The SHSPWM inverter is simulated without and with a pie filter in MATLAB/Simulink software to understand performance differences. SHSPWM performance is compared with Sinusoidal PWM, Sixty-Degree PWM and Trapezoidal PWM. The analysis was done by varying modulation index and carrier frequency to see inverter output variation.