Real-time transition from continuous PWM to discontinuous PWM technique

Abstract

This paper introduces the prospect of transition from continuous pulse width modulation (PWM) technique to discontinuous PWM technique in real-time. The discontinuous PWM technique mitigates switching loss by incorporating the dead band in train of switching pulses, and total harmonic distortion (THD) of discontinuous PWM is comparable to the continuous PWM technique, particularly at high amplitude modulation ratio (m a ). Consequently, implementing real-time transition to discontinuous PWM can significantly reduce switching losses while maintaining acceptable THD performance, particularly in scenarios involving high m a . This transition offers improved efficiency and better overall system operation. This paper discusses space vector PWM (SVPWM) and discontinuous space vector PWM techniques (DSVPWM); Comparison of these techniques is validated experimentally. Performance metrics for experimental implementation involve voltage THD, current THD, linearity, and fundamental output voltage. The algorithm of transitioning from SVPWM to DSVPWM in real-time is given. The proposed transition is validated by simulation on MATLAB2021a-Simulink