Reliability Evaluation for Complex Distribution System Based on the Simplified Zone Model and the Minimal Path

A method of reliability evaluation for complex medium-voltage distribution system based on feeder partition model and the minimal path method is proposed in this paper. According to the topology of distribution system, a distribution network is divided into different zones, and then the distribution network is changed into an oriented diagram. Applying the minimal path method, this diagram is divided into the minimal path and the sub systems, based on network-reliability equivalent. The effect of failure of the components in the sub-systems on the load point is converted into the corresponding node connected with the sub-system in the minimal path, so the reliability indices of the load point can be calculated according to the load point´s minimal path by use of the consequence analysis of fault Pattern. By enumerating all the load points and applying above technique, the reliability indices of the electrical distribution system can be calculated. The application of the proposed algorithm to RBTS-Bus6 shows its effectiveness.