A reliability evaluation method for distribution networks considering passive islanding detection failure

A new reliability assessment method for distribution system with distributed generations (DGs) is proposed in this paper, aiming to quantitatively analyze the undesired impact caused by passive islanding detection failure. Firstly, the paper analyzes the impacts of DG interconnection on auto-reclosing operation and system reliability due to failure of anti-islanding detection when a transient or permanent fault occurs. Secondly, the power features in the moment of detection-failure are calculated and utilized for judging whether they exist in the nondetection zones (NDZ) of several common passive islanding detection methods. Then, the new reliability evaluation procedure is given and reliability indices of distribution system could be obtained considering passive islanding detection failure. In the end, the IEEE RBTS Bus6 test system, connected with photovoltaic and wind power, is built to prove the effectiveness of the proposed approach.