Abstract
Recent wide spread applications of power electronic equipment has caused an increase of the harmonic disturbances in the power systems. The nonlinear loads draw harmonic and reactive power components of current from AC mains. Here an adaptive hysteresis band current controlled shunt active power filter is presented to eliminate harmonics and to compensate the reactive power of three-phase rectifier. This current controller changes the hysteresis bandwidth according to modulation frequency, supply voltage, DC capacitor voltage and slope of the reference compensator current wave. An algorithm based on synchronous reference frame theory (d-q-0) is used to determine the suitable current reference signals. The feasibility of the presented scheme is confirmed using the MATLAB Simulink Power System Toolbox and the results were analyzed. Hardware implementation of system has been done to validate the simulation results obtained. Analysis of the results shows that the presented method is found quite satisfactory to eliminate harmonics and reactive power components from utility current and is also found effective to meet IEEE 519 standard recommendations on harmonics levels. Keywords: Shunt Active power filter, d-q-0 Reference frame, Adaptive hysteresis band current controller.
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