SIMULATION OF DSTATCOM UNDER DIFFENTE FAULT CONDITIONS

ABSTRACT In this paper the 12-pulse D-STATCOM configuration with IGBT is designed and the graphic based models of the DSTATCOM are developed using the PSCAD/EMTDC electromagnetic transient simulation program. The reliability and robustness of the control schemes in the system response to the voltage disturbances caused by series and simultaneous faults are obviously proved in the simulation results. In this paper, in order to mitigate voltage sags caused by series and simultaneous fault, a new method is proposed in which firstly, the D-STATCOM and super capacitor energy storage system (ESS) are integrated and secondly, a feedback in out of PI controller is used to improve the control system performance under different types of operational conditions. Considering this fact that all types of faults may occur in distribution system, controller system must be able to mitigate any types of voltage sags. The integration and control of ESSs, such as super capacitor or Ultra Capacitor (UC) into a D-STATCOM is developed to mitigate such problems, enhance power quality and improve distribution system reliability