Phase-Locked Loop (PLL) Controller for Distribution Synchronous Static Compensator (D-STATCOM) to Mitigate Voltage Flicker

Voltage flicker is one of the most significant disturbances in electrical distribution power systems. An electric arc furnace is considering as one of the major source of voltage flicker due to it an unbalanced, nonlinear and time-varying characteristic. Distribution Synchronous static compensator (D-STATCOM) has been proved to be more efficient and dynamic device to compensate voltage flicker in power system. The proper control algorithm to its control loop is an interfering factor in the quality enhancement of this compensator. This paper presents a Phase-Loop Locked (PLL) Controller technique for 6-pulse D-STATCOM to effectively compensate voltage flicker due to electric arc furnace load. To evaluate the effectiveness of the proposed technique, testing has been conducted under IEEE 13 distribution bus test system. The simulation results show the fast time response of 6-pulse D-STATCOM using PLL controller to mitigate the fast varying voltage flicker into perceptible level.