Unified voltage modulation technique for real-time three-phase power conversion

In this paper, a new voltage modulation technique named 'unified pulsewidth modulation (PWM)' is described for high-performance voltage generation in a three-phase voltage-fed inverter. By considering the operation of the inverter, a simple but useful concept named 'effective time' can be established and, by fully employing this concept, a new voltage modulation technique is presented with a detailed explanation and actual test results. The results show that various carrier-based PWM schemes can be implemented with reduced computational burden and a seamless change from one modulation scheme to another is possible. Index Terms - Carrier-based pulsewidth modulation, effective time, three-phase voltage-fed inverter.