This paper presents a shunt active power filter (APF) for mitigating harmonics and reactive-power compensation in the distribution system. The compensation process is based on modified-synchronous reference frame (modified-SRF) control strategy that is different from conventional-SRF method. A simple and efficient unit vector calculation is used in the proposed modified-SRF in lieu of phase locked loop for vector orientation that cancels the presence of harmonics and notches in the distribution system. The shunt active power filter is implemented with voltage source inverter (VSI) and its switching pulses are generated through a novel adaptive-fuzzy-hysteresis current controller (HCC). The adaptive-fuzzy-HCC calculates the hysteresis bandwidth effectively with the help of fuzzy logic controller (FLC). This method reduces the switching power losses and improves the VSI performances for active filter substantially compared to fixed-HCC and adaptive-HCC. The shunt active filter system is validated through extensive simulation under both steady-state and transient conditions with different nonlinear loads. Comparative assessments of conventional-SRF and modified-SRF reference current generator methods are carried out.
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P. Karuppanan (2019) studied this question.