A fault detection and isolation algorithm for distribution systems containing distributed generations

For the smart distribution system with distributed generation, a new fault detection and isolation matrix algorithm based on the fault overcurrents and their directions is proposed. Using the correlation matrix to describe the network topology, and the fault overcurrents and their directions from the grid´s different fault detect points to form the fault information matrix, the fault section can be diagnosed quickly and precisely through the calculation of the two matrices. With the current network structure and the breaker status, the fault isolation can be realized. On this basis, a modified algorithm suitable for network topology changes is proposed by modifying the fault information matrix and the breaker trip vector.