Impact of DG location on protection coordination in distribution systems

Recent developments have once again directed the public interest to small scale and local generation of electricity. Environmental Problems, Reliability and Electrical Market are typical reasons for this revision. Injection of DGs currents to a distribution network results in loosing radial structure and also increasing fault current level. It causes the protection issues like unwanted tripping, protection blinding and mal-operation of fuses. The severity of protection influence of distributed generations depends on the type, location and the size of DGs. In this paper a novel method has been presented for quantizing the dependence of protection problem to DG´s location. This method can also specify the location with the least protection problems for DG installation. Genetic algorithm is employed for this search and specification and the proposed method has been run for a real network with implementation of DIgSILENT Power Language (DPL).