Fault Information Correction and Fault Section Location Method of Active Distribution Network

With the integration of Distributed Generation (DG), the fault characteristics of the distribution network have undergone a profound change. Influenced by distributed generation and environmental factors, the fault information uploaded by the Feeder Terminal Unit (FTU) undergoes distortion, leading to inaccurate fault localization. Therefore, this paper proposes a method for the correction of alarm signals and fault section localization. Firstly, a current similarity analysis method of adjacent section is performed to determine whether the initial fault localization results include the actual fault section. If it does, only the fault localization result needs to be modified; otherwise, it is necessary to correct the distorted alarm signals. Then, for cases requiring correction of alarm signals, the distribution network is divided into several regions with the interconnection points of DG or branch lines as the boundaries, the telemetry information is utilized to compare the currents of the first and last sections in each region with the maximum load current. Based on the correlation between the comparative results, this method screens the regions that may have faults. The current similarity analysis is conducted to identify the faulty section in these selected regions. Finally, this paper validates the effectiveness of the proposed method using PSCAD simulation data.