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An improved HVDC transmission line traveling wave protection method

A transmission line, traveling wave protection technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of limiting protection performance, difficult to distinguish internal and external faults, etc.

Inactive Publication Date: 2019-01-11
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
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Problems solved by technology

However, the traditional traveling wave protection method is easily affected by the fault resistance and fault distance. When the fault resistance is high and the fault distance is long, it is difficult to distinguish internal and external faults, thus limiting its protection performance.

Method used

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  • An improved HVDC transmission line traveling wave protection method
  • An improved HVDC transmission line traveling wave protection method
  • An improved HVDC transmission line traveling wave protection method

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with the drawings and specific implementation process.

[0011] see first figure 1 , conventional TWP devices are installed on points M and M' on the rectifier side and on points N and N' on the inverter side. Taking the positive pole protection on the rectifier side as an example, f1 is the DC line fault, f2 is the rectifier side line fault, and f3 is the inverter side line fault. f1 is an internal fault, and f2 and f3 are external faults. This method mainly discusses the distinction of faults f1, f2 and f3.

[0012] see figure 2 , the improved HVDC transmission line traveling wave protection method of the present invention comprises the following steps:

[0013] (1) Real-time acquisition of the instantaneous voltage u of the two-pole line of the DC system (a) , u (b) signal and instantaneous current i (a) i (b) signal, and eliminate signal impurities through the LC filter circuit, and finall...

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Abstract

The invention discloses an improved HVDC transmission line traveling wave protection method, aiming at the problem that the HVDC transmission line is prone to the transient fault, and further improving the stability of the whole HVDC transmission system through the improved line traveling wave protection method. The protection method mainly comprises the following steps: acquiring voltage and current fluctuation signals on both poles of a DC system in real time and eliminating signal impurities; at that time of the data reach the starting threshold, the fault identification unit is star; the fault identification unit analyzes and identifies fault types based on the improved fault parameter criteria. This method can overcome the problem that it is difficult to distinguish the internal faultfrom the external fault when the fault resistance is high and the fault distance is long in the traditional traveling wave protection. The detection accuracy is higher, which provides reliable protection action basis for the subsequent fault control and elimination.

Description

technical field [0001] The invention relates to an improved traveling wave protection method for a high-voltage direct current transmission line, and belongs to the technical field of electric power system relay protection. Background technique [0002] High-voltage direct current transmission (HVDC) plays an increasingly important role in long-distance and high-power transmission because of its advantages such as large transmission power, low line cost, and good control performance, and is especially widely used in long-distance large-capacity transmission. In recent years, in my country, due to the reason of "power transmission from west to east, mutual supply between north and south, and nationwide networking", the country has vigorously developed UHV, making HVDC transmission a hot spot in power construction. The safety and reliability of high-voltage direct current transmission lines are not only related to the stability of the system, but also directly affect the stabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/268H02H7/262H02H7/263
Inventor 郑泷康夏向阳杨明圣赵昕昕
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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