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Direct-current line single-terminal fault location method for multiterminal flexible direct-current transmission system

A technology for DC transmission systems and DC lines, which is applied to fault locations and uses pulse reflection method to detect faults, etc., to achieve the effects of obvious distributed parameter characteristics, easy detection, and stable transient characteristic frequency energy.

Active Publication Date: 2015-03-04
XI AN JIAOTONG UNIV
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the single-end fault location method of the existing fault location principle and propose a non-traveling-wave, high-reliability multi-terminal flexible DC transmission system DC line single-end fault location method

Method used

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  • Direct-current line single-terminal fault location method for multiterminal flexible direct-current transmission system
  • Direct-current line single-terminal fault location method for multiterminal flexible direct-current transmission system
  • Direct-current line single-terminal fault location method for multiterminal flexible direct-current transmission system

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Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0027] see figure 1 As shown, large capacitors are connected in parallel on both sides of the DC transmission line of the multi-terminal flexible DC transmission system. This system structure makes the traveling wave at high frequency fully reflected on the system side. When a metallic fault occurs, the traveling wave is also totally reflected at the fault point, and the energy of the traveling wave will attenuate to a certain extent when the transition resistance increases. On the other hand, the DC line is generally long, and the distribution parameter characteristics are obvious. The reflection at the end makes the propagation delay of the traveling wave between the system side and the fault point fixed, and it appears in the form of characteristic frequency in the frequency domain. This characteristic frequency is inversely proportional to the fault dist...

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Abstract

The invention provides a direct-current line single-terminal fault location method for a multiterminal flexible direct-current transmission system. The method comprises the following steps of: 1, acquiring fault transient state current magnitude from a current divider of a direct current line side of the multiterminal flexible direct-current transmission system; 2, extracting a characteristic frequency signal and calculating a characteristic frequency value according to the measured fault transient state current magnitude by spectrum analysis; and 3, calculating a fault distance according to the characteristic frequency value by combining the wave velocity under the characteristic frequency value. According to the method, only the single-terminal current data is used during fault location, the required sampling rate is low, and a calculation step is simple; a travelling wave tip is not needed to be identified, and the method is reliable and safe; and short data window accurate fault location can be realized. The fault location method is suitable for parallel, series and hybrid multiterminal flexible direct-current systems.

Description

【Technical field】 [0001] The invention relates to a method for locating a line fault in a power system, in particular to a method for locating a single-end fault of a direct current transmission line in a multi-terminal flexible direct current transmission system. 【Background technique】 [0002] my country's energy distribution and power grid structure determine that HVDC transmission has broad application prospects. Traditional two-terminal DC can only realize point-to-point DC power transmission. When DC interconnection is used between multiple AC systems, multiple DC transmission lines are required, which will greatly increase investment costs and operating costs. With the development of economy and the construction of power grid, it is inevitable that the power grid can realize multi-source power supply and multi-drop power receiving. Therefore, multi-terminal DC transmission system has attracted more and more attention because of its economical, flexible and reliable ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/11
Inventor 宋国兵蔡新雷高淑萍索南加乐
Owner XI AN JIAOTONG UNIV
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