Abstract—Harmonics and power factor control are two key points in steady state operation of the electrical power systems. STATCOM and its control system can be used to improve the power system performance in the case of power quality issues. Thus in this paper, a new approach of predictive control system based on discrete state space system is used to control the instantaneous power compensator of D-STATCOM for compensating harmonics and improve power factor is presented. The proposed control method is useful to limit some power quality disturbances and also some steady state properties. To evaluate the performance of the proposed control methods and compare them with conventional control methods, 22 kV distribution network with a nonlinear load such as a three-phase rectifier and also added inductive load is examined. Simulation result indicates that the proposed control strategy improved the power factor and reducing THD compared to the conventional control method.

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