Harmonic Reduction of Current by Using Phase Shifting and Shunt-Active Filter Trained by Fuzzy Particle Swarm Optimization

In this paper, the current total harmonic distortion (THD) is reduced in two stages, including phase shifting in load currents and using an active filter (AF). An AF comprises three essential elements, including the identification phase, the modulation method, and the inverter. In the identification phase, an appropriate control reference signal is generated via temporal or frequency methods. Then the inverter block produces this control signal in the form of power by using a modulation method and injects it into the line so that the current harmonics will be reduced. In the AF for generating reference signals of the inverter, the frequency spectrum of line current is used. Current reference signals are converted to voltage reference signals by a PI controller. Afterwards, these signals are generated by using an inverter and an appropriate modulation method. The important point is to determine the coefficients of the PI controller. It is noteworthy that the determination of such coefficients and their effects on the overall performance of the filter has seldom been studied. In this study, the PI controller coefficients have been determined using an optimization fuzzy particle swarm optimization (PSO) algorithm. This manuscript has been simulated by MATLAB software.

Automated summary

This paper presents a two-stage approach to reduce current total harmonic distortion (THD), involving phase shifting in load currents and using an active filter (AF). The PI controller coefficients for the AF are determined using an optimization fuzzy particle swarm optimization (PSO) algorithm.