Impact of Renewable Distributed Generation on Protection Coordination of Distribution System

Mahesh Dahal, Ajay Kumar Jha, Rudra Mani Ghimire

This paper presents a study on protection coordination of protective devices in a radial distribution system by considering penetration of distributed generation. This paper presents the study of protection coordination among various protective devices without and with penetration of DGs in distribution network. The proposed approach is tested on modified IEEE 13 Bus radial distribution system.  When fault occurs in the system, level of fault current changes which in turn changes the operating time of various overcurrent relays. Therefore, it is essential to calculate and recommend method of the relay setting so as to minimize the operating time of relays and also to avoid its mal-operation. In this paper, the protection scheme is optimally developed by taking into consideration the above mentioned circumstances. The operating time of relays can be reduced and, simultaneously, coordination can be maintained by considering the optimum values of time dial setting (TDS). The proposed method used the Genetic Algorithm (GA) for determining the optimum values of TDS of overcurrent relays and hence operating time of circuit breaker CB.

https://dx.doi.org/10.31873/IJEAS/6.4.2019.17