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Direct current line fault rapid protection method and apparatus in overhead line flexible direct current power grid

A DC line fault, flexible DC technology, applied in emergency protection circuit devices, power transmission AC networks, electrical components, etc., can solve the problems that the protection concept does not conform to the development direction of DC power grids, and the research on overhead line flexible DC power grids is still blank.

Active Publication Date: 2018-02-06
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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AI Technical Summary

Problems solved by technology

However, the above protection measures are only applicable to small-scale DC power grids, and their protection concept does not conform to the development direction of DC power grids
In addition, most of the existing DC power grids are based on cable transmission methods, while the research on overhead line flexible DC grids is still blank.

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  • Direct current line fault rapid protection method and apparatus in overhead line flexible direct current power grid
  • Direct current line fault rapid protection method and apparatus in overhead line flexible direct current power grid
  • Direct current line fault rapid protection method and apparatus in overhead line flexible direct current power grid

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Embodiment Construction

[0080] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0081] The research on DC power grid line protection will still focus on how to quickly detect and identify faults, trigger DC circuit breakers in time, and realize rapid isolation of fault points and system recovery. Similar to the existing conventional DC line protection, single-ended electrical quantity protection based on initial traveling wave and transient voltage and current will be the first solution to achieve fast and even ultra-high-speed protection. The judgment of the initial traveling wave needs to solve the problems of distinguishing the inside and outside of the fault traveling wave area, and the distinction between the lightning wave and the fault traveling wave. The distinction of fault traveling waves can reduce the difficulty of distinction by using line reactors to increase their boundary characteristics; the distinction between lightning...

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Abstract

The invention provides a direct current line fault rapid protection method and apparatus in an overhead line flexible direct current power grid. Multiple protection criteria are formed by introductionof DC under-voltage protection, DC voltage traveling wave protection and DC current traveling wave protection etc., and the reliability of a rapid protection algorithm is improved; and the transitionresistance tolerance capability and the noise anti-interference capability of the protection algorithm are enhanced by employing wavelet transform. Besides, the method and apparatus can be applicableto direct current power grids with any endpoint number by employing a parallel processing mode of lightning stroke interference and fault protection discrimination to further compress the protectiontime, and the reduction of the applicability due to complexity of a direct current power grid line structure, the change of the type of a converter, and the change of the direct current voltage levelis prevented.

Description

technical field [0001] The invention relates to the technical field of flexible DC power grids in electric power systems, in particular to a method and device for quickly protecting DC line faults in an overhead line flexible DC power grid. Background technique [0002] With the depletion of fossil energy and the increasing environmental carrying capacity, countries around the world have gradually adjusted the proportion of renewable energy in the energy structure dominated by traditional fossil energy. Wind power and photovoltaic power generation are the main forms of renewable energy development and utilization. Most of my country's renewable electric energy is located in the western and northern regions away from the central and eastern loads, such as wind power and photovoltaics in the Qaidam region of the Qinghai-Tibet Plateau. At the same time, in view of the regional dispersion of renewable energy power generation systems in these areas, they are usually sent in the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02H7/26
CPCH02H7/268H02J3/36Y02E60/60
Inventor 孔明贺之渊庞辉董新洲杨杰吴亚楠常彬裴翔羽
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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