Fault location method based on dynamic real-time parameters for t-type line voltage cross correction

Abstract

Based on the dynamic real-time parameters, the voltage cross correction fault location method along the T-shaped line uses the electrical information of the T-shaped line under normal operating conditions to dynamically calculate the real-time parameters of the three-terminal line in real time, and corrects the calculation error of the real-time parameters of the line based on the genetic algorithm; After a line fault occurs, based on the line distribution parameter line model under the modified parameters, the T node voltage is calculated respectively, and the faulty branch is judged by voltage comparison; then the two non-faulty branches are equivalent to the T terminal, which forms The two-end transmission line model; finally, two straight lines are formed by using the measured voltage on both sides and the calculated voltage on the opposite side, and the intersection point is obtained based on the intersection of the straight lines to form a fault location method. The invention can dynamically adjust line parameter errors in real time, improves fault distance measurement accuracy, and has strong engineering practicability.

Description

technical field [0001] The invention relates to a fault location method for T-type transmission lines, in particular to a fault location method based on dynamic real-time parameters for voltage cross correction along the T-type line. Background technique [0002] With the development of the power system, when limited by the power supply radius, corridor, etc., T-type transmission lines are often used for power transmission. When a line fault occurs, accurate fault location plays an important role in the safety, stability and economic operation of the power system. Journal of Electrical Engineering, 2011, 31(4):93-98.). At present, the power frequency electrical parameters of the transmission line are often used for distance measurement, but in actual operation, the electrical parameters are susceptible to dynamic changes due to environmental influences such as weather, temperature, humidity, and earth resistivity. Therefore, the accuracy of line fault location based on fix...

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Problems solved by technology

[0005] In order to overcome the above-mentioned deficiencies in the prior art, the present invention proposes a method based on dynamic real-time parameters along the T-type line voltage cross correction fault distance measurement method, which mainly solves the following problems: 1), solves the problem that the transmission line parameters in actual engineering are easy to change However, the problem of affecting the distance measurement accuracy can realize dynamic real-time correction of transmission line parameters; 2), overcome the problem of dead zone of T node identification in T-shaped lines, and ensure that no matter the fault occurs in a branch or near the T node, it can be correctly identified ; 3), ensure high-precision distance measurement for line faults, and solve the problems of complex calculation and many iterations required by many existing distance measurement schemes

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