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A simplified control strategy for Series Hybrid Active Power Filter that compensat voltage sag, swell, unbalance and harmonics

Power quality problems have received increasing attentions in recent years due to proliferation of nonlinear and sensitive loads as well as unpredictable and unavoidable system faults. Power quality problems mainly include current and voltage harmonics, reactive power, supply unbalance, sag, swell etc. Series Hybrid Active Power Filters (SHAPF) have been the main topic of interest for researchers working in the area of active power filters (APF). SHAPF provides cost-effective solution as compared to standalone active filters and are preferred to compensate both voltage and current type harmonics. This paper present simplified control strategy for SHAPF with added functionality of compensating voltage sag, swell and unbalance. Mathematical formulation of reference generation scheme with simulation verification of SHAPF model is tested for compensation of voltage sag, swell, unbalance and harmonics is presented.