An adaptive hysteresis band current control for three phase shunt active power filter U sing Fuzzy logic

Over the recent years, in order to compensate current harmonics and reactive power in three power systems, active filtering is used increasingly often. The reference current extraction method and the PWM technique used in the control of active power filter have an important role, because any inaccuracy yields to incorrect compensation. This paper presents a new adaptive hysteresis band controller for three phase shunt active power filters implemented using the Fuzzy logic. The simulations were carried using Matlab SimPowerSystems and Fuzzy logic toolboxes under two load configurations, balanced and unbalanced. The results are found quite satisfactory in order to keep the switching frequency constant, and to compensate the current harmonics, unbalance and reactive power in three phase electrical systems.