Power electronic loads inject harmonic currents into the utility system. The active filtering is an attractive way to compensate both harmonics and reactive power. In this paper, the control of a single-phase active power filter is studied. The control objectives are defined formelly. For simplicity, only the case of harmonics compensation is considered. Different control methods such as high gain control (hysteresis, discrete proportional), pole placement, H_2 and H_infinity designs are reivewed and compared. Some of them are implemented to verify their efficiency.
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