Hysteresis Band Current Control For Harmonic Compensation of Unbalanced & Nonlinear load

Abstract

Abstract-In this paper, instantaneous reactive power theory (IRP), also known as p-q theory based control algorithm is proposed for 4-leg shunt active power filter (APF) to suppress harmonic line currents and neutral current and balance the load currents under unbalanced non-linear load and nonideal mains voltage conditions. The p-q theory is composed from 4-leg voltage source inverter (VSI) with a hysteresis-band PWM current controller. Conventional p-q theory for different loading condition such as nonlinear load and unbalanced load along with Hysteresis band current control technique is simulated and harmonic disturbances has been analysed. All simulations are carried out using Matlab/Simpowersystem.