Fuzzy Logic Controlled Active Power Line Conditioners for Power quality Improvements

Abstract

This paper describes a novel fuzzy logic controller for a three-phase shunt active power filter for the power-quality improvement such as reactive power and harmonic current compensation generated due to nonlinear loads. The approach of fuzzy logic control is linguistic description, so it does not require a mathematical model of the system. The application of the Mamdani-type fuzzy logic controller to a three-phase shunt active power filter is investigated. The controller is capable of controlling dc capacitor voltage and generating reference source currents. Hysteresis current controller is used for current control in PWM inverter. Extensive simulation studies under both transient and steady states are conducted. The simulation results reveal that the active filter performs perfectly in conjunction with fuzzy logic controller.