Evaluation algorithm for bi-directional protection coordination in distribution system with distributed generations

Abstract

Recently, with the increasing of the interest about global warming, pollutions and so on, a number of distributed generations (DGs) such as photovoltaic (PV) and wind power (WP) are interconnected with distribution systems. However, installing of DGs makes power flow changes such as directions, one-direction to bi-direction, and increasing/decreasing of fault current. Therefore, it may cause the critical problems. This paper proposes an evaluation algorithm for bi-directional protection coordination and presents an evaluation system for protection coordination based on the algorithm. By performing simulations, the result shows that the existing method may cause critical problems, and also the effectiveness of proposed method is verified. © 2011 Springer-Verlag.