Line double-end fault positioning method and system based on golden section search

Abstract

The invention discloses a power transmission line double-end fault positioning method and system based on golden section search. The method comprises the steps of collecting the positive sequence voltage and positive sequence current at a double-end bus of a line at a fault moment when a short-circuit fault happens to a power transmission line, and listing a voltage calculation equation along theline by combining with a line impedance admittance parameter; selecting two test points on the line with the short circuit fault according to the golden section proportion; and respectively comparingthe double-end reckoning voltages of the two test points according to the voltage calculation equation along the line so as to judge a fault interval. The method is based on the voltage distribution characteristics along the line of the lumped parameter model, and the fault point is the minimum value point of the positive sequence voltage distribution curve, so that the search algorithm can be used for infinite approximation until the positioning precision requirement is met. The calculation pressure can be reduced, and meanwhile, the iteration speed is higher. The fault positioning calculation efficiency and reliability are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of distribution network fault location methods, and more specifically relates to a method and system for double-terminal fault location of lines based on golden section search. Background technique [0002] With the development and progress of our society, safe and reliable power supply has become an important link related to national life and industrial production. At the same time, the economic loss and negative impact caused by power outages are becoming more and more obvious, and the demand for continuous supply and distribution of high-quality electric energy is becoming more and more urgent. As a basic part of the distribution network, transmission lines have a high incidence of line faults due to various factors such as wide distribution, long-term exposure to the natural environment, line aging, and human destruction. Therefore, it is very important to accurately and quickly find the cause and locat...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a method and system for double-terminal fault location of transmission lines based on golden section search, aiming to solve the problem of insufficient accuracy of the voltage distribution location method

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