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High-frequency transient component direction longitudinal protection method and system

A transient component, longitudinal protection technology, applied in emergency protection circuit devices, power transmission AC networks, electrical components, etc., can solve problems such as weak research on DC transmission technology

Active Publication Date: 2019-02-22
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the research on DC transmission technology in my country is relatively weak, and most of the protection systems of DC transmission projects that have been put into operation use the technologies of ABB and SIEMENS.
In recent years, under the continuous innovation of Chinese electric power scientific research personnel, the autonomy of HVDC transmission control and protection units has been basically realized, and the core technology of DC transmission has been gradually mastered. However, my country still has a large gap in the protection of UHVDC transmission lines. research space

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  • High-frequency transient component direction longitudinal protection method and system
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  • High-frequency transient component direction longitudinal protection method and system

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Embodiment 1

[0052] The present invention proposes a high-frequency transient component direction protection method based on Hilbert-Huang transform.

[0053] A high-frequency transient component directional protection scheme based on Hilbert-Huang transform. The scheme first extracts the high-frequency transient component information of voltage and current at the protection installations on both sides of the UHVDC transmission system when the fault occurs, and then uses EMD to decompose to obtain the voltage and current The IMF1 component of the high-frequency transient component, on this basis, uses Hilbert-Huang to find the sudden phase difference of voltage and current. According to the relationship of the phase difference, a logic criterion is formed to comprehensively judge the internal and external faults; The fault pole can also be identified.

[0054] The basic principles of the high-frequency transient component directional protection scheme based on Hilbert-Huang transform provided b...

Embodiment 2

[0086] This embodiment provides a directional longitudinal protection system for high-frequency transient components, which includes:

[0087] High-frequency transient component extraction module: Extract the high-frequency transient components of voltage and current at the protection installations on both sides of the UHVDC transmission system;

[0088] The module for obtaining the highest frequency component: EMD decomposition to obtain the highest frequency component of the voltage and current high frequency transient components, the highest frequency transient component contains the required fault information;

[0089] Phase difference calculation module: take the highest frequency transient component for Hilbert-Huang transformation, which is used to calculate the phase difference of the voltage and current high frequency transient components;

[0090] Use Hilbert-Huang transform to obtain the phase difference of high-frequency transient components of voltage and current;

[0091] ...

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Abstract

The invention discloses a high-frequency transient component direction longitudinal protection method and system. The method is characterized by through extracting voltage and current high-frequency transient component data at a protection installation position, calculating the phase relation of a voltage and current high-frequency transient component according to Hilbert-Huang conversion, and realizing internal and external fault determination of a UHVDC power transmission system line; and on the basis of identifying a fault in a direct current line area, carrying out simple logic processingat the fault directions of the two sides of an anode and a cathode so that a fault pole can be selected without a complicated fault selection pole scheme. For various fault types, the faults in the line area and outside the line area can be accurately identified, and fault pole selection can be performed. The protection method is less affected by the factors of a transition resistor, a fault distance and the like.

Description

Technical field [0001] The invention belongs to the technical field of power system fault identification, and relates to a high-frequency transient component direction longitudinal protection method and system based on Hilbert-Huang transform. Background technique [0002] With the development of AC power grids and the rapid increase in the scale of interconnection, the stability problems of AC interconnection and the capacity limitation of long-distance transmission of AC lines have turned people's attention to DC transmission again. The structure of the DC transmission system is simple, and the positive and negative poles operate symmetrically under normal conditions, and there is no power angle stability problem, which can improve the reliability of the future networked power system. In 1954, the world's first power grid commutated HVDC power transmission project was put into commercial operation. High Voltage Direct Current (HVDC) is widely used in cross-regional, large-capa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08H02H7/26H02J3/36
CPCH02H7/262H02H7/263H02J3/36G01R31/08Y02E60/60
Inventor 胡列翔赵光静王增平韩志军马静张亚刚裘愉涛陆承宇王松戚宣威吴佳毅吕哲王家慧汪冬辉孙文文阮黎翔丁峰陈明
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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