Improvement of electricity distribution services using a DVR with a constant DC voltage source instaled in MV connection substations

Abstract

This paper analysis the Dynamic Voltage Restorer response provided for voltage sags mitigation in the electrical distribution networks with connection substation topology. Most often the voltage sags are caused by severe faults on the lines adjacent to main feeder and by faults on main feeder of connection substation. A realistic configuration of the electricity distribution network, similar to the distribution networks with connection substation that had been developed in Bucharest area is modeled. A DVR topology was chosen and implemented in Matlab/Simulink. The DVR performances are compared for different fault conditions. The results obtained during this study proves that the use of DVR for voltage sags mitigation on connection substation bus bars is a good solution for this type of distribution networks. Keywords-dynamic voltage restorer (DVR), electricity distribution networks, custom power devices, voltage sags.