Design and Optimization of Distribution Network Short Circuit Fault Location Algorithm Based on DTU and FPI

Accurate and rapid location of short-circuit fault in distribution network is of great significance to improve the reliability of power supply in distribution network. At present, the short-circuit fault location of distribution management system (DMS) main station requires high data quality of line terminals, and there are problems such as poor fault tolerance and low accuracy of fault location, and it is not suitable for fault location of multi-point simultaneous short circuit. In this article, the short-circuit fault detection technology of DMS based on wavelet algorithm is proposed, and the fault current is detected and fault location is carried out by using the cooperation of Distribution Terminal Unit (DTU) and Fault Passage Indicators (FPI), which integrates fault detection and fault location. The experimental data and analysis results show the effectiveness of this method. With the help of wide-area synchronous measurement information, this method realizes the detection and location of two fault points of two-phase grounding short circuit. Moreover, this method can detect whether single-phase overcurrent occurs and the location of overcurrent in other lines when a single-phase grounding fault occurs, so as to achieve the goal of detecting and locating the weak point of equipment insulation, which provides technical support for improving the reliability of lines.