Method for measuring fault location of HVDC (High Voltage Direct Current) transmission line under consideration of measured wave velocity

A transmission line, high-voltage DC technology, applied in directions such as fault locations, can solve problems such as low ranging accuracy
CN104597376AActive Publication Date: 2015-05-06XIAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAN UNIV OF TECH
Publication Date
2015-05-06

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Abstract

The invention relates to a method for measuring fault location of a HVDC transmission line under consideration of measured wave velocity; the method is characterized by comprising the following steps: considering the variation characteristic of the wave velocity on the basis of the traditional dual-end location measuring method, and performing the calibration of a wave tip and the determination of the wave velocity in the same process; respectively acquiring the positive and negative data of the voltage of the HVDC transmission line by means of devices at two ends of the line; after the data is subjected to filtering processing and line-mode conversion, analyzing the obtained line-mode traveling wave, obtaining a time-frequency oscillogram of signals and determining the arrival time of the fault traveling wave to two ends of the line as well as a corresponding instantaneous frequency value; obtaining the corresponding line-mode wave velocity by using frequency-wave velocity curves; and finally, obtaining the fault distance by means of a dual-end distance measurement formula.
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Description

technical field

[0001] The invention belongs to the technical field of high-voltage direct-current transmission relay protection in electric power systems, and in particular relates to a method for fault location of high-voltage direct-current transmission lines considering measured wave velocity. Background technique

[0002] When a fault occurs on a high-voltage direct current transmission line, it is of great significance to ensure the safety, stability and economic operation of the power system by quickly and accurately determining the fault location, eliminating the fault in a timely manner, eliminating hidden dangers, and restoring power supply.

[0003] At present, the traveling wave method is widely used in the world as the main method for fault location of HVDC transmission lines, and the instantaneous traveling wave of current and voltage is used to realize line fault location. According to the amount of collected information, it can be divided into single-terminal...

Claims

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