Impact of Twelve-pulse D-STATCOM on Voltage Sags Mitigation in Distribution Systems

This paper presents a study about response of distribution system under presence of voltage sags implementing distribution static compensator (D-STATCOM). From simulations, it analyzes the modified IEEE-13 distribution system identifying those nodes that highly affect the voltage profiles in the distribution system using a method of fault positions (critical nodes). It presents D-STATCOM model based on twelve-pulse inverter, taking advantage of the available elements and the TACS-MODELS tool from ATP/EMTP. Further, the performance of the distribution system using D-STATCOM in several cases is analyzed, showing that this device is a good alternative for sags mitigation. In addition, the relation between the injected D-STATCOM reactive power, the type of sag and the location of affected nodes is considered.