CN-115980506-B - Short circuit fault judging method and device for same-tower double-circuit direct current transmission line and computer equipment

CN115980506BCN 115980506 BCN115980506 BCN 115980506BCN-115980506-B

Abstract

The application relates to a short circuit fault judging method, a short circuit fault judging device and computer equipment for a same-tower double-circuit direct current transmission line. The method comprises the steps of determining candidate short-circuit lines in at least two fault lines according to rectification station end currents, inversion station end currents and line grounding currents of each fault line if at least two fault lines are detected in the same-tower double-circuit direct-current transmission line, and determining target short-circuit lines in the candidate short-circuit lines according to the rectification station end currents, the inversion station end currents and the line grounding currents of the candidate short-circuit lines. By adopting the method, the high efficiency and accuracy of judging the target short circuit line can be improved, and the consumption of manpower and material resources can be greatly reduced.

Inventors

DAI SHULONG
NONG GAOZHAO
LING ZEQIANG
ZHENG SENWEN
LI LIN
ZHANG RUI
LIU BAISHUANG
TENG ZHAOLIN
ZHOU YASHU
XU XUEHAI
XIN LIANG
YANG MAO

Assignees

中国南方电网有限责任公司超高压输电公司曲靖局

Dates

Publication Date: 20260505
Application Date: 20221208

Claims (8)

1. A short circuit fault judging method of a same-tower double-circuit direct current transmission line is characterized by comprising the following steps: if at least two fault lines exist in the same-tower double-circuit direct current transmission line, summing the current at the inversion station end of each fault line and the line grounding current to obtain a first intermediate current of the fault line; Performing difference operation on the current at the rectifying station end of the fault line and the first intermediate current to obtain a second current difference value of the fault line; If the second current difference value of the fault line reaches a second current threshold value and the line grounding current of the fault line does not reach a third current threshold value, determining the fault line as a candidate short circuit line; summing the current of the inversion station end of each candidate short circuit line and the loop grounding current to obtain a second intermediate current of the candidate short circuit line; Performing difference operation on the rectification station end current of the candidate short circuit line and the second intermediate current to obtain a third current difference value of the candidate short circuit line; And if the third current difference value of the candidate short circuit line reaches a fourth current threshold value and the loop grounding current of the candidate short circuit line does not reach a fifth current threshold value, determining the candidate short circuit line as a target short circuit line.
2. The method of claim 1, wherein detecting the presence of at least two faulty wires in the same-tower double-circuit dc transmission line comprises: Determining a first current difference value between the current of a rectifying station end and the current of an inverting station end of each power transmission line of the same-tower double-circuit direct current power transmission line; And if the first current difference value is detected to be larger than a first current threshold value, determining that the power transmission line is a fault line.
3. The method according to claims 1-2, characterized in that the method further comprises: determining the corresponding operation mode of the fault line according to the on-off condition of a switch of a loop where the fault line is located; And determining the line grounding current of the fault line according to the operation mode corresponding to the fault line.
4. The method according to claims 1-2, characterized in that the method further comprises: Determining a fault loop corresponding to each candidate short circuit line; Determining the corresponding operation mode of each fault loop according to the on-off condition of the switch of each fault loop; And determining the loop grounding current corresponding to each candidate short circuit line according to the operation mode corresponding to each fault loop.
5. The utility model provides a with short circuit trouble judgement device of tower double-circuit direct current transmission line which characterized in that, the device includes: The candidate determining module is used for carrying out summation operation on the current of the inversion station end of each fault line and the line grounding current if at least two fault lines exist in the same-tower double-circuit direct current transmission line, so as to obtain a first intermediate current of the fault line; if the second current difference value of the fault line reaches a second current threshold value and the line grounding current of the fault line does not reach a third current threshold value, determining the fault line as a candidate short circuit line; The target determining module is used for carrying out summation operation on the inversion station end current and the loop grounding current of each candidate short circuit line to obtain second intermediate current of the candidate short circuit line, carrying out difference operation on the rectification station end current of the candidate short circuit line and the second intermediate current to obtain a third current difference value of the candidate short circuit line, and determining that the candidate short circuit line is the target short circuit line if the third current difference value of the candidate short circuit line reaches a fourth current threshold and the loop grounding current of the candidate short circuit line does not reach a fifth current threshold.
6. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 4 when the computer program is executed.
7. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 4.
8. A computer program product comprising a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the method of any of claims 1 to 4.

Description

Short circuit fault judging method and device for same-tower double-circuit direct current transmission line and computer equipment Technical Field The application relates to the technical field of electric power, in particular to a short circuit fault judging method, device and computer equipment of a same-tower double-circuit direct current transmission line. Background The high-voltage direct-current transmission system has the advantages of large transmission capacity, flexible power adjustment and the like, and is widely applied to ultra-high voltage, long-distance and large-capacity direct-current transmission. In addition, the same-tower double-circuit direct current transmission system can save a large amount of transmission corridor, so that the same-tower double-circuit direct current transmission system has been widely applied to long-distance large-capacity direct current transmission. The long-distance power transmission line is longer, and when extreme weather such as storm, mud-rock flow, earthquake, mountain fire is encountered on the line, the short circuit condition between the lines easily appears, influences the safe and stable operation of transmission system. However, when the lines are in short circuit, the influence of the lines can only be manually analyzed by checking the influence of the waveform analysis lines, so that the high efficiency of fault judgment and the timeliness of fault treatment are affected to a certain extent, and a large amount of manpower and material resources are consumed. Therefore, how to quickly and efficiently locate the short-circuited line becomes a urgent problem to be solved. Disclosure of Invention Based on the above, it is necessary to provide a short circuit fault judging method, device and computer equipment capable of rapidly and efficiently positioning the same-tower double-circuit direct current transmission line. In a first aspect, the application provides a short circuit fault judging method of a same-tower double-circuit direct current transmission line. The method comprises the following steps: If at least two fault lines exist in the same-tower double-circuit direct current transmission line, determining candidate short circuit lines in the at least two fault lines according to rectification station end currents, inversion station end currents and line grounding currents of the fault lines; And determining a target short circuit line in the candidate short circuit line according to the rectification station end current, the inversion station end current and the loop grounding current of the candidate short circuit line. In one embodiment, detecting at least two fault lines in the same-tower double-circuit direct current transmission line includes: Determining a first current difference value between the current of a rectifying station end and the current of an inverting station end of each power transmission line of the same-tower double-circuit direct current power transmission line; and if the first current difference value is detected to be larger than the first current threshold value, determining that the power transmission line is a fault line. In one embodiment, determining a candidate shorted line of at least two faulty lines according to the rectifying station side current, the inverting station side current, and the line ground current of each faulty line includes: summing the current of the inversion station end of each fault line and the line grounding current to obtain a first intermediate current of the fault line; performing difference value operation on the current at the rectifying station end of the fault line and the first intermediate current to obtain a second current difference value of the fault line; if the second current difference value of the fault line reaches the second current threshold value and the line grounding current of the fault line does not reach the third current threshold value, determining the fault line as a candidate short circuit line. In one embodiment, determining a target short circuit line in the candidate short circuit line according to the rectification station end current, the inversion station end current and the loop grounding current of the candidate short circuit line includes: summing the current of the inversion station end of each candidate short circuit line and the loop grounding current to obtain a second intermediate current of the candidate short circuit line; performing difference operation on the rectification station end current and the second intermediate current of the candidate short circuit line to obtain a third current difference value of the candidate short circuit line; And if the third current difference value of the candidate short circuit line reaches a fourth current threshold value and the loop grounding current of the candidate short circuit line does not reach a fifth current threshold value, determining the candidate short circuit line as a target short circ