Lightning strike identification method for DC overhead line based on modulus analysis
An identification method and an overhead line technology, which are applied in the direction of detecting faults and fault locations according to conductor types, can solve the problems that traveling wave protection of DC transmission lines is easily disturbed by lightning strikes, and achieve correct criteria, convenient implementation, and small amount of calculation Effect
Active Publication Date: 2019-12-24
XI AN JIAOTONG UNIV +2
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[0004] The purpose of the present invention is to provide a modulus analysis-based lightning strike recognition method for DC overhead lines to solve the problem that the existing DC transmission line traveling wave protection is susceptible to lightning strike interference
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[0049] The following describes the lightning strike identification scheme further in conjunction with the attached drawings:
[0050] The invention provides a method for identifying a lightning strike on a direct current overhead line based on modulus analysis, so as to solve the problem that the traveling wave protection of the existing direct current transmission line is easily interfered by lightning strikes. The present invention first establishes a double exponential mathematical model of lightning current, and builds a DC transmission tower multi-wave impedance model under PSCAD software without ignoring the lightning protection line; by simulating the different positions of the lightning strike DC line, the single-ended under different lightning strike conditions is obtained Current data: On the basis of analyzing the physical process of lightning strikes, perform modulus analysis on simulation data to identify specific lightning strike types and identify lightning strike i...
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The invention discloses a method for recognizing DC overhead line lightning stroke based on modulus analysis. The method comprises the following steps of: 1, after traveling wave protection is started in a DC overhead line, acquiring 40[mu]s current data, calculating a line mode current fault component and a ground mode current fault component; 2, determining whether a unipolar ground fault or a bipolar fault; 3, determining whether a lightning conductor is subjected to lightning stroke, a tower is subjected to lightning stroke and a fault and lightning stroke is induced; and 4, determining the lightning conductor and fault, and the lightning stroke tower and flashover. The method is simple and reliable. A large amount of simulation calculation shows that the lightning stroke recognition method has correct and effective criteria, can distinguish between lightning stroke interference and faults, can accurately determine lightning stroke types and line fault types, and achieves dual functions of fault recognition and lightning stroke recognition.
Description
Technical field [0001] The invention relates to the technical field of line protection, in particular to a method for identifying a lightning strike of a DC overhead line based on modulus analysis. Background technique [0002] my country's vast territory and the reverse distribution of energy and load determine that large-capacity DC transmission has broad application prospects in my country. In recent years, flexible DC transmission has been widely used in island power transmission, distributed energy access and DC distribution network due to its excellent characteristics. As the most important energy transmission channel, DC overhead lines have a harsh working environment and high failure probability. At present, in the large-capacity DC overhead line transmission system, traveling wave protection has been widely used due to its rapidity and is increasingly irreplaceable. Due to the use of transient signals, high-frequency interference is the most important factor affecting ...
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IPC IPC(8): G01R31/08
CPCG01R31/086
Inventor 宋国兵顾垚彬郭安祥张晨浩王辰曦吴子豪
Owner XI AN JIAOTONG UNIV