Harmonic rejection control scheme for PWM DC/AC power converter

It has been shown that repetitive compensators can be a useful strategy for tracking periodic references or rejecting periodic disturbance signals with a known period. A class of modified repetitive compensators reproduces exactly an infinite set of resonant filters tuned at the appropriate frequencies; however, they add an infinite set of notch filters between the resonant filters. A sufficient stability criterion is developed for this compensators when they are used in a closed-loop system. Some practical guidelines are also given in this paper for tuning these compensators. At the end, an illustrative example is given for a practical PWM DC-AC power converter.