Reliability evaluation for distribution system connected with distributed generations

This paper presents a reliability index calculation method for distribution system connected with Distributed Generations (DGs). First, the sequence model of DGs and load are established on the assumption that the time unit of power changes is an hour. Then, on the basis of the concept of segmentation, four types of data structures are presented to represent the topological structure and parameters of the distribution system. According to the differences of each segment affected by the fault, the distribution system will be divided into six types of areas, and the outage time of each load point are determined by the result of area division and load optimization in the island. At last, the synchronous sampling of DG output and load size is realized by time sequential Monte Carlo simulation and the reliability indices are calculated.