An Adaptive Gain of Proportional-Resonant Controller for an Active Power Filter

Load changing behavior effects the performance of a compensating current control for an active power filter. Thus, in this article, adaptive proportional-resonant controller is proposed. A fuzzy logic algorithm is applied as the adaptive gain mechanism for the proportional-resonant controller. The new design technique for the proposed controller is fully presented in this article. The criterion for designing the adaptive proportional-resonant controller follows the root locus technique and the modulation index analysis of the switching technique. The overall control strategy is implemented using an eZdsp F28335 board. For testing in the laboratory, balanced, and unbalanced nonlinear loads are considered. Experimental results confirm that the adaptive proportional-resonant controller designed by the new approach can provide good performance compared with the proportional-integral and proportional-resonant controllers. Moreover, the proposed controller can still mitigate the harmonics even if the nonlinear loads are suddenly changed.