An active distribution network fault location method based on FTU and transformer alarm information

A fault location method for active distribution networks based on FTU and transformer alarm information fusion is proposed to solve the phase-to-phase short-circuit fault location of active distribution network with DG. First, by considering the different characteristics of FTU and distribution transformer alarm information after a distribution network fault, the corresponding matrices reflecting the relationship between fault zones and alarm information are built according to the distribution network topology, and a new switching function is developed which effectively avoids tedious logical operations. Then, an optimization model is established from the actual alarm information of the two information sources respectively and analyzed using a genetic algorithm to calculate the fault probability of each zone under the corresponding information source. Finally, the results from the two information sources are fused using evidence fusion theory to obtain the final fault location results. The modified IEEE 33-bus distribution grid is used as an example for simulation verification, and the results show that the proposed method can not only realize the location of single point and double faults, but also has high fault tolerance. © 2022 Power System Protection and Control Press. All rights reserved.