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

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...

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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-point Fault information, according to the network topology, use different algorithms for fault location, so as to quickly, reliably and accurately remove the fault, and analyze the impact of the fault removal on the safe and stable operation of the system, and adopt corresponding strategies to ensure the safe operation of the power system

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