High-voltage direct current power transmission line protection method based on wavelet transformation and energy spectrum analysis

A technology of wavelet transform and high-voltage direct current, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as misoperation of protection devices and induction of fault signals

Inactive Publication Date: 2014-03-12
TONGJI UNIV
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  • Abstract
  • Description
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Problems solved by technology

At the same time, lightning strikes will affect the action of the protection device, which may easily cause the protection device to malfunction. Therefore, eliminating the impact of lightning strikes on the protection device has become a problem that should be solved.
In addition, the current DC transmission lines are often operated with bipolarity, and the two-pole lines are arranged side by side on the same tower. This makes it possible that when one pole fails, the other pole may also induce a fault signal. How to distinguish between the faulty pole and the healthy pole in the two poles? has become one of the problems that should be solved

Method used

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  • High-voltage direct current power transmission line protection method based on wavelet transformation and energy spectrum analysis
  • High-voltage direct current power transmission line protection method based on wavelet transformation and energy spectrum analysis
  • High-voltage direct current power transmission line protection method based on wavelet transformation and energy spectrum analysis

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Embodiment Construction

[0052] Please refer to the accompanying drawings for a further description of the present invention.

[0053] like figure 1 As shown, the present invention provides a protection method for HVDC transmission lines based on wavelet transform and energy spectrum analysis, comprising the following steps:

[0054] Step 1: The starting criterion is formed by setting the threshold value for the voltage fluctuation. When the line voltage fluctuation is less than the positive threshold value or greater than the negative threshold value, the protection device will not start; when the line voltage fluctuation is greater than the positive threshold value or less than the negative threshold value is , the protection device starts;

[0055] Step 2: Perform wavelet transformation on the traveling wave head of the fault voltage at the converter stations on both sides, and then compare the polarity of the modulus maxima after the transformation. If the polarity of the modulus maxima is oppos...

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Abstract

The invention discloses a high-voltage direct current power transmission line protection method based on wavelet transformation and energy spectrum analysis. According to the method, a starting criterion is formed through setting a threshold value on the voltage fluctuation, the frequent starting of a protection device caused by system voltage non-fault fluctuation is prevented, and in addition, the reliable starting can be realized when a direct current power transmission line fails; a fault voltage traveling-wave head wavelet transformation metatype maximum value polarity comparison method is utilized for distinguishing in-area and out-area faults; the energy distribution features of transient voltage in different frequency bands are utilized for distinguishing the fault and the lightning stroke interference, and meanwhile, fault poles and perfect poles of a double-pole system are identified.

Description

technical field [0001] The invention relates to a protection method for a high-voltage direct current transmission line, in particular to a protection method for a high-voltage direct current transmission line based on wavelet transform and energy spectrum analysis. technical background [0002] HVDC transmission is an emerging transmission technology in recent years. Due to its characteristics of low line loss and low line cost, it has been more and more widely used when long-distance power transmission and large-capacity power transmission are required. In recent years, my country's high-voltage direct current transmission technology has developed rapidly. Tianguang 500kV, Genan 500kV and other HVDC transmission lines have been put into operation. The operation of these lines has brought great value to my country's electric power industry. However, according to the statistical data of HVDC transmission faults at home and abroad, there are still many faults in HVDC tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 金敬鑫张文豪
Owner TONGJI UNIV
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