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Abstract
– The electronic and non-linear devices are flexible, economical and energy efficient, they may degrade power quality by creating harmonic currents and consuming excessive reactive power. A family of various shunt hybrid active power filters has been explored in shunt and series configurations to compensate for different types of nonlinear loads. They provide controlled current injection to remove harmonic current from the source side of electric system and also can improve the power factor. In this thesis, first three-phase system is implemented without filter, its source current, compensating current and THD values are studied, then PI control strategy is applied then the differences in THD are compared.A Lyapunov-function based control algorithm for a SH-APF is proposed and implemented to enhance its response to compensation of harmonics of non-linear loads.