Time-domain fault location method of multibranch direct current line in multiterminal direct current power transmission system

A technology for DC transmission systems and DC lines, applied in directions such as fault locations

Active Publication Date: 2012-05-09
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the singleness and insufficiency of the existing fault location principle, and propose a time-domain fault location method for multi-branch DC lines in a multi-terminal DC system with non-traveling waves and high reliability

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  • Time-domain fault location method of multibranch direct current line in multiterminal direct current power transmission system
  • Time-domain fault location method of multibranch direct current line in multiterminal direct current power transmission system
  • Time-domain fault location method of multibranch direct current line in multiterminal direct current power transmission system

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Embodiment Construction

[0036] Attached below figure 1 And attached figure 2 The present invention is further described in detail.

[0037] see figure 1 and figure 2 As shown, the DC line is generally long, and the distribution parameter characteristics are obvious. The method of the present invention is based on the distributed parameter model, and according to the branch point boundary conditions, the faulty branch is selected by calculating the voltage of the branch point; for the faulty branch, the three-terminal line is converted by calculating the voltage and current distribution along the direct current transmission line The two ends of the line are formed, and the voltage distribution along the line is calculated from the electrical quantities at both ends of the fault branch, and the voltage calculated according to the fault point is always equal to realize fault location.

[0038] The method of the present invention is based on the distributed parameter model of the direct current tra...

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Abstract

The invention provides a time-domain fault location method of a multibranch direct current line in a multiterminal direct current power transmission system. The method is established on the basis of a distributed parameter model; in a time domain, sampling values of a direct current and a direct current voltage are converted into moduluses by utilizing modular transformation; according to voltages and currents at terminal points of a line, voltages of branch points of the line are calculated; comparison is carried out on voltages that are obtained by calculation of electric quantities at all the terminal points so as to select a fault branch; all good branches are used to calculate a voltage and a current of a branch point, and the electric quantity of the branch point and the electric quantity of the other end of the fault branch form a two-terminal line; and electric quantities of the two terminals are used to respectively calculate voltage distribution along the line, and fault location is realized according to a constant equal situation of voltages calculated at a fault point. According to the invention, a needed sampling rate is low and calculation is simple; and precise fault location with a short data window can be realized. Besides, the fault location method can be applied to a multiterminal direct current system containing branch lines, wherein the multiterminal direct current system can be a parallel system, a tandem type system or a mixing system.

Description

【Technical field】 [0001] The invention relates to a time-domain fault location method for a power system line, in particular to a time-domain fault location method for a multi-branch direct current line in a multi-terminal 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 characte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 宋国兵蔡新雷高淑萍索南加乐
Owner XI AN JIAOTONG UNIV
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