Control of 3-level shunt active power filter using harmonic selective controller

In this paper the control of 3-level shunt active power filter is proposed using frequency selective proportional plus multiple resonant controllers. The voltage source converter (VSC) is operated using ramp-comparison current control method. The method provides fixed switching frequency operation, and unipolar modulation of a control function yields three-level PWM output. The resonant controllers are tuned near the harmonic frequencies to be compensated. The issues of compensator ratings and loss calculations are addressed. The performance of the proposed shunt active power filter is illustrated through the compensation of a distribution system using PSCAD/EMTDC simulation package