Abstract
This paper presents an adaptive hysteresis band current controller applied to hybrid power filters to compensate harmonics and the reactive power of a nonlinear load. This method changes the hysteresis bandwidth according to modulation frequency, supply voltage, dc capacitor voltage and slope of the reference compensator current wave. The hysteresis band current controller determines the switching signals of the active part of hybrid filter, and the algorithm based on an extension of synchronous reference frame theory (d-q-0) is used to determine the suitable current reference signals. To evaluate its performance, this method is compared to the conventional hysteresis band current controller. Simulation results using MATLAB Simulink Power System Toolbox show the performance of the proposed control algorithm with quite satisfaction to eliminate harmonics and reactive power components from utility current. The hybrid power filter is found effective to meet IEEE 519 standard recommendations on harmonics levels.
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