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Distribution network quasi-radar protection method

A distribution network and distribution network system technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of DG access uncertainty, real-time protection cannot be guaranteed, etc., to ensure safe and stable operation , accurate fault part, fast and reliable action effect

Active Publication Date: 2016-03-30
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a radar-like protection method for the distribution network, which can solve the problem of uncertainty in the access of each DG in the network, and the problem that the real-time performance of protection cannot be guaranteed, and can more accurately judge the system The fault part, so that the protection can act quickly and reliably, and ensure the safe and stable operation of the system

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  • Distribution network quasi-radar protection method

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Embodiment 1

[0040] like figure 1 As shown, a radar-like protection method for distribution network, the method includes the following steps:

[0041] 1) Analyze the topology of the distribution network system, including the number of nodes and the current flow direction of each node;

[0042] 2) performing hierarchical processing on the topological structure, and then dividing each search surface according to the hierarchy;

[0043] 3) Carry out longitudinal search on each search surface of the distribution network system according to the level, each level corresponds to a search surface, do phasor sum operation on the current of the line layer intersecting with the search surface to obtain the collective surface current of the search surface, and then Calculate the current collection change value between different search surfaces, and find out the line layer where the fault is located according to the current collection change value;

[0044] 4) Do horizontal search and calculation on ...

Embodiment 2

[0067] like Figure 5 and Figure 6 Figures (a) and (b) respectively show the comparison of the current changes of the three search surfaces in the longitudinal and lateral search of similar radars. Taking the three-phase ground short-circuit fault at the end of the line 2 as an example, the current collection changes of the three search surfaces The following is the change curve of the polar surface current of each search surface when a short-circuit fault occurs at the end of each line. From the figure (a), it can be found that the current of the search surface I has a large mutation, and it can be judged that the fault has occurred On the branch line on the search surface I. Since there are two branch lines directly connecting the search plane I and the search plane II, it is necessary to search horizontally. Figure (b) shows the search results of branch line I and branch line II. Obviously, the current collector on branch line 2 changes greatly, reaching 12KA, so it can ...

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Abstract

A distribution network quasi-radar protection method comprises the following steps: (1) analyzing the topology of a distribution network system, including the number of nodes and the current direction of each node; (2) grading the topology, and marking out search surfaces according to the hierarchy; (3) longitudinally searching the search surfaces of the distribution network system according to the hierarchy; and (4) transversely searching and calculating the current of each branch of a line layer to which a fault occurs, further positioning a line to which the fault occurs, and finally cutting off the faulty line, thus completing quasi-radar protection to the distribution network. By using the distribution network quasi-radar protection method provided by the invention, the problem that real-time protection cannot be guaranteed due to the uncertainty of DG access in the network can be solved, the faulty part of the system can be judged more accurately, rapid and reliable protection can be offered, and safe and stable operation of the system is ensured.

Description

technical field [0001] The invention relates to the field of protection of distributed power sources connected to distribution networks, in particular to a radar-like protection method for distribution networks. Background technique [0002] In recent years, with the increasingly severe environmental problems, countries have placed their future energy development on new energy power generation technologies. Due to the uncertainty of distributed power capacity and access location, the power flow direction of the distribution network has also changed from directional to non-directional, which brings difficulties to the traditional protection based on setting value. At the same time, the traditional protection based on radial network The time limit for the protection of the distribution network close to the power source may be too long to remove the fault in time. How to ensure the fast and reliable action of the protection in the distribution network connected to the distribut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H7/28
CPCH02H7/262H02H7/28
Inventor 潘美翁汉琍杨国稳
Owner CHINA THREE GORGES UNIV