Performance investigation of fractional PI controller in shunt active filter for a three-phase three-wire system

Abstract

Due to advancement in the properties of semiconductor devices, they are widely used in domestic as well as industrial application. These devices are showing nonlinear property and cause different power quality issues. Harmonic is one of the major power quality issues. To eliminate these harmonics, various technologies have been developed including passive filters, zigzag transformers, active filters, etc. Active filters can be used in different configurations such as series active filters, shunt active filters, etc. In this work, shunt active power filter has been used to eliminate the harmonics from the system and is based on the instantaneous active and reactive power theory. Pulse-width modulation current control technique has been used to generate pulses for voltage-source converter. PI controller is used to regulate the DC voltage. To obtain the accurate output result, tuning of PI controller parameters (proportionality constant Kp, integral constant Ki) is required. Fractional PI controller has been studied in this paper and its performance has been compared with the performance of conventional PI controller. The Use of fractional-order PI controller increases with the passage of time because its performance is better than the conventional PI controllers. It contains one more constant term, called as fractional constant with proportionality constant and integral constant for the tuning which provides accurate result.