Atonement of harmonics and reactive power with three phase SAPF under sundry source voltage

In this paper, instantaneous reactive power theory (IRP), also known as p-q theory based a new control algorithm is presented for 3-phase 3-wire and 3-leg shunt active power filter (SAPF) to suppress harmonic currents and compensate reactive power under non ideal voltage sources. The reference current signals are generated by sensing the source voltage, load current and dc bus voltage. With these signals the driving signals are generated via hysteresis band PWM current controller. To check robustness of the control algorithm four different cases such as ideal, unbalanced, balanced distorted and unbalanced distorted main voltage are considered and simulated with different firing angle of the load. The simulation work is carried out in MATLAB/SIMULINK Power system block set. The performance of the proposed algorithm is found quite effective and satisfactory under non-ideal main voltage conditions.