Dynamic time bending distance fault section locating method based on time sequence compression

Abstract

The technical scheme of the invention is a dynamic time bending distance fault section locating method based on time sequence compression. The method comprises the steps: carrying out the preprocessing of the fault record data collected by a feed line terminal device, wherein the preprocessing operation comprises the extraction of the initial value and extreme values of the record data and the changes of the record data, and obtaining a new time sequence of the record data; transmitting the time sequence to a main station, solving the similarity of zero-mode currents of two adjacent feed lineterminal devices via a dynamic time bending distance algorithm through the main station, and determining a fault section. The beneficial effects of the invention are that the data size, compared withan original time sequence, is reduced by a half or more, thereby greatly reducing the communication cost; for a high-frequency signal, the dynamic time bending distance algorithm is stronger in synchronization error prevention capability and signal amplitude response capability than a correlated coefficient method; the method provided by the invention is higher in robustness, and does not need the strict time synchronization.

Description

technical field [0001] The invention relates to a dynamic time warping distance fault section location method based on time series compression, which belongs to the field of computer power fault location. Background technique [0002] Most of my country's medium-voltage distribution network adopts the neutral point non-effective grounding operation mode. When a single-phase ground fault occurs, the system cannot form an effective short-circuit loop, so the ground current is small, the fault electrical quantity is weak, and the fault feature extraction is difficult. The fault operation of the distribution network will cause the normal phase voltage to rise, resulting in the breakdown of the weak link of the insulation, and then develop into a phase-to-phase or multi-point fault, reducing the reliability of the system power supply. The traditional solution of relying on manual testing in the station and on-site line inspection not only consumes manpower and material resources,...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the large amount of data processing and the need for time synchronization in the distribution network fault section location method based on the transient zero-mode current correlation coefficient method, this paper proposes a dynamic time-bending distance fault section location method based on time series compression

Images