Modeled Fault Location, Isolation And Restoration For Distribution Network Structures

With the rapid socio-economic development, power users demand increasingly high reliability of power supply. Improving reliability has become the consensus of the domestic power companies. By leveraging the advantages of grid structures, the proposed distribution network fault location, isolation and restoration methods, can make troubleshooting more accurate and efficient. It is practically significant for improving the reliability of power supply and the service quality of power supply.In this paper, the typical distribution network structures and module division has been studied, and distribution network model is established based on model units, which is defined herein.The principles and method of distribution network fault location and isolation are studied. And taking the feeder as subject, a high fault tolerance fault location method is proposed based on firefly algorithm. The process of distribution network fault location and isolation is built using multiple fault information, and its effectiveness has been verified by examples.The method of distribution network sound sectors’ restoration, which is based on the typical power distribution grid structures, is studied. And an optimization method of restoration based on the heuristic search algorithm, is proposed. In this paper, the heuristic search algorithm, takes "modeled restoration method is used preferentially" as a heuristic rule, while ensuring that important users get priority to the power supply. In the distribution network containing DG, the priority use of DG for power supply is advocated, making the distributed power supply plays an important role in restoration.