Adaptive-Hysteresis Current Controller based active power filter for power quality enhancement

This paper presents a shunt active power filter for power quality enhancement in terms of harmonics and reactive-power compensation due to the non-linear loads in the distribution network. The compensation approach uses calculation of real-power (p) losses only, which is simpler and different from the conventional p-q theory. The voltage source inverter based active filter switching pulses are generated from adaptive-Hysteresis Current Controller (HCC). This adaptive-HCC changes the hysteresis-bandwidth according to the instantaneous compensation current variation that is used to optimize the required switching frequency. This would improve the active power filter performances. The three-phase shunt active power filter system is investigated under both steady state and transient conditions with non-linear loads.