Short-Circuit Fault Section Location Method of Flexible Interconnected Distribution Network Based on Transient Component Similarity

The existence of soft normal open points (SNOP) in flexible interconnected distribution networks makes traditional fault location methods difficult to apply. This article proposes a method for locating fault sections in flexible interconnected distribution networks using waveform similarity of positive sequence current transient components. Firstly, considering the typical topology and control strategy of the system, analyze the fault characteristics of the flexible interconnected distribution network during short circuit faults. On this basis, the transient components of positive sequence current at different positions are extracted, and the waveform similarity is described by calculating cosine similarity. Finally, the Teager energy operator is used to accurately calibrate the fault time, and the intelligent distribution terminal is used to transmit information. By comparing the waveform similarity at different positions, a flexible interconnected distribution network short-circuit fault location criterion is constructed. The feasibility of the proposed method was verified through modeling and simulation, and the effects of fault location, fault type, transition resistance, and sampling frequency on the positioning results were analyzed.