High-voltage direct current transmission line fault distance measurement method based on HHT normalized iteration

A technology for high-voltage direct current transmission and transmission lines, which is applied to the fault location, fault detection according to the conductor type, and electrical measurement. It can solve the problems of misjudgment of the wave head and difficulty in determining the wave speed of the traveling wave fault distance method.

Pending Publication Date: 2019-12-31
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a three-terminal traveling wave fault location method based on HHT and iterative for the problems that th

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  • High-voltage direct current transmission line fault distance measurement method based on HHT normalized iteration
  • High-voltage direct current transmission line fault distance measurement method based on HHT normalized iteration
  • High-voltage direct current transmission line fault distance measurement method based on HHT normalized iteration

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Embodiment Construction

[0052] The present invention is specifically described below by examples, it is necessary to point out that this example is only used to further explain the present invention, and can not be interpreted as limiting the scope of the present invention, those skilled in the art can according to the above-mentioned present invention Some non-essential improvements and adjustments have been made to the content.

[0053] In conjunction with example, the concrete steps of the inventive method are as follows:

[0054] 1. Use the high-voltage DC transmission model built by Matlab / Simulink to collect high-frequency current signals.

[0055] This example is built as image 3 The HVDC model shown is used to simulate a single-pole ground fault at high frequencies.

[0056] Simulation parameters: the power supply voltage level is 230kV, the simulation time is 0-0.2s, the fixed length between MPs is d=400km, and the total length of the line is 1200km. The specific parameters of the transm...

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Abstract

The invention provides a high-voltage direct current transmission line fault distance measurement method based on HHT (Hilbert-Huang Transform) normalized iteration. Aiming at the problem that it is easy to generate a wave head misjudgment point due to excessively high frequency in a traveling wave ranging method, a method based on HHT normalized iteration is provided, and influences caused by thewave head misjudgment points are eliminated; a three-terminal traveling wave method is used for power transmission line fault location, the problem that it is difficult to calculate the wave speed inthe traditional traveling wave ranging method is solved, and the positioning accuracy is improved; compared with a positioning method of wavelet transformation, the method provided by the invention has the advantages that a normalized time-amplitude diagram formed by HHT normalized iteration is utilized to perform wave head calibration, the stability is high, the error is small, and the method provided by the invention is basically not influenced by factors such as transition resistance and fault distance, and the positioning precision is high.

Description

technical field [0001] The invention relates to a method for fault distance measurement of high-voltage direct current transmission lines based on HHT-normalization iteration. Specifically, the present invention applies the method of combining Clarke transform (Clarke), Hilbert-Huang transform (HHT) and one-time iteration to fault location of high-voltage direct current transmission lines, and belongs to the technical field of fault location of transmission lines. Background technique [0002] HVDC transmission lines are an integral part of the power system, but the occurrence of transmission line faults will pose a huge threat to the safe operation of the power system. Therefore, it is of great significance to quickly detect the fault location to shorten the maintenance time of power outages and maintain the stability of the power system. At present, fault location methods include impedance method, natural frequency method, and traveling wave method. Impedance method is a...

Claims

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Application Information

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IPC IPC(8): G01R31/08G06F17/14G06F17/50
CPCG01R31/085G01R31/088G06F17/14
Inventor 张安安周志通曲广龙王思远庄景泰彭高强李茜杨威
Owner SOUTHWEST PETROLEUM UNIV
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