Overmodulation Technique on Common Mode Voltage Reduction PWM Inverter using Saw-Wave Carrier Signal

This study proposes a new method of overmodulation for remote state pulse width modulation (PWM) (RSPWM) using a mass-produced controller capable of only using fixed carrier based PWM. Two techniques are used in the proposed method to add overmodulation to the RSPWM that uses only odd voltage vectors. The first technique is to adjust the voltage width while maintaining the total pulse width of all voltages constant. The second technique is using the non switching of all six gate signals to select even voltage vectors. This study shows the effects of these techniques using simulations and experiments with a modulation index of 0.78.