VOLTAGE SAG COMPENSATION USING DISTRIBUTION STATIC COMPENSATOR (DSTATCOM)

Distribution Static compensator (D-STATCOM) is employed to solve the sag problems in this paper. In order to operate a four wire DSTATCOM in voltage control mode, it requires a reference voltage. To generate the required reference voltage, a new schematic algorithm is developed. It ensures Unity Power Factor (UPF) at different load and fault conditions, which is not possible in conventional scheme. Also, the shunt active filter injects lower current which reduces losses in the feeder and VSI. Furthermore, the power saving capacity of DSTATCOM mitigates the voltage sag. As the voltage is regulated at different load condition, UPF is maintained. The power quality issues are tackled by correcting the power factor, eliminating the harmonic distortion, balancing the load and regulating the voltage based on the load requirement.