Fault Location Method of Power Line Based on Real-Time Parameter Estimation

In order to accurately determine the location of the short-circuit fault point of the distribution power line, this paper first proposes a method for estimating the line parameters of the distribution network based on multi-source data and multi-time sections from the micro-synchronous phasor measurement unit (μPMU) which can be deployed on a large scale. It not only uses the sampling rapidity of μPMU to fuse the measurement data of multi-time sections, but also uses the precise time scale of μPMU to align the data on the same time section, and establishes a typical trunk/branch connection mode of the distribution network to construct a parameter estimation model for real-time estimation of the line parameters. On this basis, the mathematical model of distribution line parameter identification and fault location is established, and the simulation analysis is carried out based on PSCAD/EMTDC. The error of parameter identification and its influence on the final location are studied, and the influence of different line types, short circuit fault types, transition resistance and fault initial angle on the algorithm is analyzed and compared with the traditional algorithm. The results show that the proposed method in this paper has high location accuracy.