Intelligent protection center-based wide-area backup protection system and method

A technology of wide-area backup protection and intelligent center, which is applied in the field of power system to achieve good self-adaptability, reduce communication volume, and avoid complicated setting process

Inactive Publication Date: 2015-04-01
XI AN JIAOTONG UNIV +1
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Problems solved by technology

[0004] At present, scholars do not have a clear and unified definition of wide-area protection, but through the analysis of its characteristics and functions, the concept of wide-area protection can be briefly described as follows: the protection devices in the power system are interconnected through optical fibers to obtain multi-poin

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  • Intelligent protection center-based wide-area backup protection system and method

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Embodiment

[0046] (1). The definition of the output of the directional element D corresponding to the protection of each circuit breaker. Define the positive direction of the direction element as the outflow bus. At present, most of the directional elements are composed of voltage and current phase difference or impedance relays. There are three possibilities for the output value of each directional element D:

[0047]

[0048] (2). Construct the bus-line correlation matrix J. Among them, the column of matrix J is the serial number of the bus connection line of the substation, the row of the bus serial number of the substation, and the matrix element is the number of the circuit breaker between the line and the connected bus. If the line is not directly connected to the bus, the corresponding element in the matrix is 0.

[0049] (3). Bus-line correlation state matrix J'. The values ​​of the elements of the bus-line correlation matrix are the output values ​​of the corresponding di...

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Abstract

The invention relates to an intelligent protection center-based wide-area backup protection system and method. The system comprises a GOOSE network for acquiring switching quantities of a plurality of substations, a sampling value network for acquiring electrical quantities of the substations, relaying protection units connected with the GOOSE network and the sampling value network and a protection intelligent center connected with the relaying protection units through a wide area network; the system further comprises merging units which are connected with mutual inductors of the substations; the merging units merge the electrical quantities measured by the mutual inductors and performs synchronization processing on the electrical quantities, and transmit the processed electrical quantities to the relaying protection units through the sampling value network; the switching quantities of the substations are transmitted to the relaying protection units through the GOOSE network; the relaying protection units calculate the direction of a fault through the obtained electric quantities, and transmit the received switching quantities and the direction of the fault which is obtained through calculation to the protection intelligent center through the wide area network; and the protection intelligent center determines the position of the fault and issues a tripping instruction. The intelligent protection center-based wide-area backup protection system and method of the invention are unrelated to the structures of power grids and the types of faults, and have the advantages of high movement speed, high reliability and strong adaptability.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a wide-area backup protection system and method based on a protection intelligence center. Background technique [0002] In 1997, Swedish scholar Bertillngelesso first proposed the concept of wide area protection in the article "Wide Areas Protection Against Voltage Collapse" published on IEEE to prevent long-term voltage collapse of the interconnected grid. After the collapse of the interconnected grid happened one after another, people realized that the cooperation between relay protection and safety devices should be strengthened from an overall perspective. With the development of national smart grid construction and the access of distributed power sources, major regional power grids are gradually interconnected, and the grid structure is becoming more and more complex. The self-healing characteristics of the grid will affect the selectivity, reliability, sensitivity an...

Claims

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Application Information

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IPC IPC(8): H02J13/00H02H7/22
CPCY02E60/00Y04S10/16Y04S10/20
Inventor 张保会薄志谦郝治国张鹭
Owner XI AN JIAOTONG UNIV
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