Simulation and comparison of DVR and D-STATCOM for voltage sag mitigation

In this paper the detail description of Flexible AC Transmission devices in distribution network are presented so as to mitigate the voltage sag at the network buses. Two FACTS devices are implemented in this paper namely Distributed Static Compensator (D-STATCOM) and Dynamic Voltage restorer (DVR). D-STATCOM provides injection of shunt current into the system and DVR provides injection of series voltage into the system to solve the problem of short term reduction in the root mean square voltage of the system. These two devices are very effectual devices working on the principle of Voltage Source Inverter. This paper elaborates the performance of the DVR and D-STATCOM during voltage sag problems. Simulation studies have been carried out to affirm the consequences. DVR and D-STATCOM are modeled and simulated using the MATLAB/Simulink and simpower system toolboxes.