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

Active Publication Date: 2015-05-06
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to provide a high-voltage direct current transmission line fault location method considering the measured wave velocity, which solves the problem of low ranging accuracy caused by the fixed wave velocity in the traditional double-ended ranging method

Method used

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

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Embodiment

[0171] A typical calculation example of a single-pole ground fault is selected: the simulation model is as follows figure 1 As shown in , set a single-pole ground fault at 100km away from the rectifier side of the DC line, and the transition resistance is 0Ω. The voltage data obtained by the measuring devices at both ends are as follows: figure 2 shown. The fault voltage data is filtered by the alternating hybrid filter of mathematical morphology, so that the phase-mode transformation is performed on the filtered fault voltage data to obtain a linear-mode traveling wave, as shown in image 3 . Decompose the line-mode voltage through EEMD to obtain its intrinsic mode function (IMF), and perform Hilbert transformation on the high-frequency component IMF1 to obtain its time-frequency diagram, as shown in Figure 4 shown. pass Figure 4 It can be determined that the moment when the fault initial traveling wave reaches the rectifier side is 1.500336s and its corresponding inst...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 段建东刘静陆海龙
Owner XIAN UNIV OF TECH
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