A fault travelling wave detection method

Abstract

The invention provides a fault travelling wave detection method comprising the steps of: S1, installing a travelling wave signal detection device in each transformer substation; S2, when a circuit hasa fault, detected signals are transmitted back to a system master station for signal processing and analysis; S3, firstly building a travelling wave signal monostable stochastic resonance model, andadjusting the parameters a and b and the sampling step size h in the travelling wave signal model so that the parameters, travelling wave signals and noise signals achieve a synergic state and energytransmitted to the travelling wave signals by noise is maximized, and effectively separating useful signals submerged in the noise signals; S4, decomposing the travelling wave signals into a pluralityof intrinsic rotary components and trend components by using intrinsic time scale decomposition, calculating the instantaneous frequency of each component, and extracting travelling wave signals, wherein the sudden change of the instantaneous frequencies embodies the sudden change of traveling wave signals and the sudden change moments of the instantaneous frequencies are the arrival moments of travelling wave signals. The method has the advantages of simple principle, high detection precision and easy implementation.

Description

technical field [0001] The invention mainly relates to the technical field of electric power detection, in particular to a fault traveling wave detection method, which is suitable for fault traveling wave signal detection of power transmission lines. Background technique [0002] With the continuous expansion of the scale of the power system, the increase of the voltage level and the higher and higher requirements of the users for the safety of the power grid, accurate fault location has become an important guarantee for rapid troubleshooting and improving the transient stability of the system. The detection accuracy of traveling wave signal directly affects the accuracy of fault traveling wave location and the reliability of traveling wave protection. The accurate detection technology of traveling wave signal becomes the key to the development of traveling wave location and protection technology. [0003] Experts at home and abroad have conducted in-depth research on travel...

AI Technical Summary

Problems solved by technology

[0004] At present, there are many methods of using software to detect traveling wave signals, and the effect is better when there is no noise or small noise interference; however, due to the complex electromagnetic interference in the substation, traveling wave signals are easily submerged by various noise signals, which increases the need for accurate detection of traveling wave signals difficulty

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