Abstract: Most of the pollution issues created in power systems are due to the non-linear characteristics and fast switching of power electronic equipment. Power quality issues are becoming stronger because sensitive equipment will be more sensitive for market competition reasons, equipment will continue polluting the system more and more due to cost increase caused by the built-in compensation and sometimes for the lack of enforced regulations. Instantaneous reactive power theory (IRP theory) is proposed for calculating the reference compensating currents required to inject into the network at PCC. Switching scheme of compensator is provided by comparing the reference compensating currents obtained from IRP theory and compensator currents. Thus, IRP theory is used to identify the amount of compensating current injected into the network to compensate the reactive power required by non-linear loads and to bring the source current waveform as sinusoidal. Simulations for a three-phase three-wire system with a shunt active power filter have been carried out for current harmonic reduction. Thus, power quality has been improved. The systems are modelled by using MATLAB/SIMULINK and performance is observed. The simulation results reveal that the proposed method of IRPT is a good solution for improving power quality and for the compensation of reactive power.

Keywords: Active Power Filter (APF), instantaneous p-q theory, adaptive hysteresis band current controller.

| DOI: 10.17148/IARJSET.2022.9296