A Method for Obtaining Radio Interference of Actual UHV DC Lines

Abstract

The invention provides an actual UHV DC line radio interference obtaining method. The method comprises the following steps: according to the number of conductor leads generating radio interference in an UHV DC test line segment, radio interference spectrum test curves at a plurality of positions are obtained through measurement; assuming that the amount of the radio interference generated by the conductor leads is a constant value at each frequency, radio interference spectrum curves of the DC test line segment and an infinite length line are obtained through calculation, and a minimum envelope of the spectrum curve of the DC test line segment and a difference matrix curve of the radio interference spectrum curve of the infinite length actual line are determined; and a minimum envelope of the radio interference spectrum test curves is obtained and is used with the difference matrix curve for calculation to obtain an actual line radio interference spectrum curve with the same excitation function as the test line segment. The method effectively reduces influence on results caused by external interference, and the minimum envelope of the radio interference spectrum test curves and the actual test curve minimum are well fitted.

Description

technical field [0001] The invention belongs to a method for predicting radio interference caused by transmission line corona in the field of electric power, and in particular relates to a method for obtaining radio interference of an actual UHV DC line. Background technique [0002] In recent years, my country's DC transmission technology has developed rapidly, and the voltage levels have covered ±400kV, ±500kV, ±660kV and ±800kV, and ±1100kV DC lines will be built in the future. The UHV DC test line section is an important test facility for studying the electromagnetic environment of DC lines. In terms of experimental research, short-distance test lines can often obtain more effective data than long-distance test lines in addition to good economics. The reason is that the weather, terrain, conductor sag, and The surrounding environment may have great changes, and these factors will have an impact on the corona discharge on the surface of the wire, and the electromagnetic ...

AI Technical Summary

Problems solved by technology

The time when multiple corona currents generated by corona discharge are injected into the line is random, and the degree of influence of end reflection on line corona current is closely related to frequency, line length, load characteristics of end connections, and line parameters. Radio interference data measured on test line sections of different lengths and end loads cannot be directly compared

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