An adaptive current control strategy for a three phase Shunt Active Filter

Abstract

A new control algorithm implemented with Adaptive Hysteresis Current Control technique for Shunt Active Filter is proposed. A three-phase six-pulse converter with resistive load is considered as the non-linear load. Many switching methods are used to produce switching pulse which leads to the generation of reference current. Hysteresis Current Control is widely used due to its simplicity in implementation, fast and accurate response. However, the main issue is its variable switching frequency which leads to extra switching losses and injecting high-frequency harmonics into the system current. To solve this problem, an Adaptive Hysteresis Current Control has been introduced which produces hysteresis bandwidth which instantaneously results in smoother and constant switching frequency. By this technique the overall Total Harmonic Distortion rate has been reduced than the Hysteresis Current Control technique. The design concept of the proposed Shunt Active Filter using the PI based control algorithm is verified through simulation and the results proved the effectiveness of the proposed algorithm.