A matrix-based fault section estimation algorithm for complex distribution systems

This paper proposes an application of matrix algorithm to fault section estimation in complex distribution systems based on directed over-current information recorded by FTU (feeder terminal unit). First, a concise unified criterion for fault location in multi-source distribution networks is put forward, which can locate both the multiple faults and the end faults. Considering the communication problems which result in incomplete or distorted FTU over-current information, solutions are given for both situations. When the FTU information is incomplete, the fault section estimation process can be carried on as normal with ignorance of the node whose information is unknown. When the fault information suffers from aberrance, fault section candidates are located first based on the unified criterion under no information aberrance. Then the final fault area is selected in terms of the fault information sequence revision cost defined in the paper. The case studies show that the approaches proposed are both correct and feasible, which can effectively resolve the fault location issues in the case of being lack of information or suffering from information aberrance, thus with great potential for application in real-time distribution network fault section estimation programs.