Robust high-order repetitive control of an active filter using an odd-harmonic internal model

摘要

Shunt active power filters have proven to be an\udefficient means to compensate for the negative effects of nonlinear\udand reactive loads on the power quality of the electrical distribution\udnetwork. In this context, the control objective is to achieve\uda power factor close to 1, as well as load current harmonics\udand reactive power compensation. A useful control strategy for\udthis purpose is repetitive control. However, the performance of\udrepetitive controllers is strongly affected by frequency variations\udof the involved signals. This work analyzes the effect of such\udvariations and describes the architecture of an odd-harmonic,\udhigh-order repetitive controller specifically designed to obtain\udrobust closed-loop performance against frequency variations that\udmay occur in the electrical network.