Research On Service Reliability Analysis Method Of Electric Power Communication Transmission Network

According to requirements of smart grid, the reliability analysis of communication transmission network is very important to power system. Transmission network as the core communication network in power system, carries many services of production and management. It is the insurance of the service operations. Power system safety and operation stability are directly affected by the reliability level of power communication network. To ensure that the power system operations are in safety and stability, reliability of the power system and power communication system is achieved by a unified consideration. By using the traditional analysis method of reliability, the whole network performance could not be weighed up on the macro level, and service performance evaluation is lacked. So the former method can't guide the operating personnel to carry out system maintenance.In this paper, we study the network reliability analysis method based on service importance, concerning the concept of the reliability of electric power communication. This method has targeted and practical features. The power communication services are classified. The stratified index system of service importance is evaluated, according to the factors that influence the service performance. Use fuzzy AHP to assess and use mean method to obtain the service importance. With the reliability analysis methods of the multi-state network, we can obtain the reliability analysis models based on minimal path sets. Further define the concept of the power communication network reliability. Additionally, combined with the services importance, the mathematical model and analysis process of network reliability based on the services importance is elaborated. Finally, an eight points end-to-end network and a power communication backbone fiber network are used as examples to anylyze and calculate the network reliability. Conclute the relationship bwteen network reliability and the threshold. Contrast with the traditional method of RBD, the reliability analysis method based on services importance is objective, flexible and practical used, and the analysis results are clear and simple.