PROTECTION COORDINATION OF DISTRIBUTION SYSTEM WITH DISTRIBUTED GENERATION

Abstract

The purpose of this research is to provide an effective technique for overcoming the implications that distributed generator (DG) integration has on the coordination among protective devices. The integration of DGs has a significant amount of impact on the recloser-fuse coordination. The most significant affects that DGs have on a normal distribution system are an increase in the size of fault currents as well as changes in the directions in which electricity flows. In the event that a transient fault occurs, the findings of the simulation suggest that it is possible to reestablish coordination among the protective devices by designing a fuse saving strategy that involves the rapid functioning of the recloser. The plan that was devised also functions adequately for isolating a portion of the feeder that is permanently faulty. For the purpose of establishing the optimal values of TDS of overcurrent relays and, by extension, the working duration of circuit breaker CB, the approach that was suggested made use of an Algorithm. As a result, it is necessary to compute and prescribe a technique of setting the relay in order to cut down on the amount of time that the relays are required to operate and also to prevent their improper functioning. The viability of this method has been shown by simulation results carried out on a genuine radial distribution system, with the findings pertaining to a variety of fault sites and DG sizes.