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Method and device for rapid protection of DC line faults in overhead line flexible DC power grid

A DC line fault and flexible DC technology, which is applied in the direction of emergency protection circuit devices, power transmission AC networks, electrical components, etc., can solve the problems that the research on overhead line flexible DC grid is still blank, and the protection concept does not conform to the development direction of DC grid. , to achieve the effects of enhancing transition resistance tolerance and noise anti-interference ability, compressing protection time, and improving reliability

Active Publication Date: 2022-04-29
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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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.

Method used

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  • Method and device for rapid protection of DC line faults in overhead line flexible DC power grid
  • Method and device for rapid protection of DC line faults in overhead line flexible DC power grid
  • Method and device for rapid protection of DC line faults in overhead line flexible DC 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 present invention provides a method and device for rapid protection of DC line faults in an overhead line flexible DC power grid. Multiple protection criteria are formed by introducing protections such as DC undervoltage protection, DC voltage traveling wave protection, and DC current traveling wave protection, and the rapid protection algorithm is improved. Reliability; and wavelet transform is used to enhance the transition resistance tolerance and noise anti-interference ability of the protection algorithm. In addition, in order to further compress the protection time, the parallel processing method of lightning strike interference and fault protection discrimination is adopted, which is suitable for DC grids with any number of terminals, and will not be affected by the complexity of the DC grid line structure, the change of the converter type, and the DC voltage level. change to reduce its applicability.

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...

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Application Information

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Patent Type & Authority Patents(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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