Abstract: This paper presents a simulation of three-phase, three-wire shunt active filter whose control strategy based on p-q theory for compensation of harmonics, reactive power and imbalance in current under non-sinusoidal supply voltage conditions. The control algorithm has been validated under various supply and load conditions using MATLAB-SIMULINK based computer simulations. With the proposed technique, the THD is reduced and power factor is improved significantly. All the simulation results are presented. The results show that the proposed algorithm is capable of meeting the requirements of IEEE 519 standard.

Keywords: Shunt active filter, p-q theory, MATLAB-SIMULINK, THD.