SMC based shunt active harmonic filter for power quality enhancement

The purpose of this paper is to design a high performance sliding mode controller through the use of a new switching function and Positive Sequence Voltage Detector (PSVD). The controller aims at controlling the source current harmonics, compensating reactive power, and improving power factor. In SMC used, the signum function is replaced by saturation function to smooth out the signal for minimizing chattering effect. By incorporating PSVD, the controller can be used, especially in the case of high voltage distortion or unbalanced input voltage signals. The proposed method is tested with balanced and unbalanced linear/non-linear load.