Method and system for judging corona onset field intensity of high-voltage direct-current line

Abstract

The invention discloses a method and a system for judging corona inception field intensity of a high-voltage direct-current line. The method comprises the following steps of acquiring synthetic electric field data of a plurality of preset positions around the line according to a preset frequency in a preset period; processing the synthetic electric field data and removing abnormal values to obtainprocessed synthetic electric field data; calculating ion flow electric field data of each measurement point according to the processed synthetic electric field data; calculating an ion flow electricfield gradient of each measurement point according to the ion flow electric field data of each measurement point; determining corona onset field intensity through a maximum gradient back-stepping method according to the ion current electric field gradient. The method is advantaged in that through a maximum gradient back-stepping method, a problem that the change rule of the ion current electric field data along with the surface field intensity of the wire is not in a linear relation or is difficult to convert into the linear relation is solved, an accurate corona onset point is judged, and theaccurate corona onset field intensity is obtained through calculation; the corona onset can be judged after long-distance measurement, and implementation safety can be ensured.

Description

technical field [0001] The present invention relates to the field of power systems, and more specifically, to a method and system for judging halo field strength of a high-voltage direct current line. Background technique [0002] Corona discharge will produce audible noise, radio interference and corona loss, etc., which will have a certain impact on the environment and operation. These problems caused by corona are important technical issues that must be considered in the design, construction and operation of power transmission projects. In addition, with the continuous development of the economy and the enhancement of people's environmental awareness, its environmental impact has attracted more and more attention, and has become an important factor in determining the structure of transmission lines and affecting construction costs. Therefore, in order to strengthen the research on UHV transmission technology, reduce and avoid the occurrence of corona and the corona effec...

AI Technical Summary

Problems solved by technology

[0004]In order to solve the problem existing in the background technology that the inaccurate determination of haloing field strength will cause large design errors in the design of UHV multi-split large cross-section conductors , the present invention provides a method and system for judging the field intensity of a high-voltage direct current line halo, the method and system obtain the ion current electric field data under each corona state through the synthetic electric field measurement data, and use the maximum gradient back-calculation method , determine accurate halo initiation point, and calculate and obtain accurate halo field strength; Described a kind of method for judging halo field strength of high-voltage direct current line, comprises:

Images