Feeder reconfiguration for distribution system contingencies with immune algorithm

This paper aims to solve contingencies for a distribution automation system (DAS) in the Taiwan Power Company. The immune algorithm is applied to derive the proper switching operation to be executed to solve the system contingencies. To represent the load behavior of distribution systems more precisely, the load patterns of various customer classes are applied to find the daily loading profiles of each service zone defined by the line switches. The hourly current flows of line switches are then solved by three-phase load flow analysis based on the actual loading of distribution feeders. The current flows of line switches and feeder configuration are updated according to the switching operation for distribution contingencies. A distribution system with 18 feeders is selected for computer simulation to demonstrate the effectiveness of the proposed methodology. It is found that the loading of overload feeder can be released and the service restoration of distribution system for a permanent fault can be obtained very efficiently by applying the proposed algorithm.