Electric power system protection method based on station area-wide area information interaction and electric power system protection system based on station area-wide area information interaction

Abstract

The invention relates to an electric power system protection method based on station area-wide area information interaction and an electric power system protection system based on station area-wide area information interaction. The method comprises the following steps that the station area intelligent terminal installed on a station area layer bus acquires bus voltage information and branch current information; when the station area intelligent terminal is abnormally activated according to the bus voltage information and the composite voltage criterion, the abnormally activated station area intelligent terminal transmits the bus voltage information and the branch current information to the wide area server arranged on a wide area layer; the wide area server determines the suspected fault line associated bus according to the bus voltage information; and the wide area server determines a fault correlation set according to the suspected fault line associated bus and the branch thereof andperforms differential calculation on the multi-terminal branch current of the differential ring in the fault correlation set according to the branch current information and determines the fault lineaccording to the result of differential calculation and cuts off the circuit breaker of the fault line. According to the technical scheme, the timeliness and the reliability of electric power system protection can be enhanced.

Description

technical field [0001] The invention relates to the technical field of power protection, in particular to a power system protection method and system based on station domain-wide domain information interaction. Background technique [0002] At the beginning of the construction of most SDH (Synchronous Digital Hierarchy) networks for power grids, the relay protection was not allocated the bandwidth to meet the wide-area differential protection, resulting in poor communication quality of the existing power grid, especially the poor quality of wide-area communication, thus The prevention and protection of power grid anomalies can only be implemented from the station domain layer. However, due to the limited protection scope and protection ability of intelligent terminals at the station domain layer, for the power grid as a whole, only through the protection of the station domain layer, its reliability needs to be improved, and it has great limitations. However, the real-time i...

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Problems solved by technology

[0002] At the beginning of the construction of most SDH (Synchronous Digital Hierarchy) networks for power grids, the relay protection was not allocated the bandwidth to meet the wide-area differential protection, resulting in poor communication quality of the existing power grid, especially the poor quality of wide-area communication, thus The prevention and protection of power grid anomalies can only be implemented from the station domain layer

However, due to the limited protection scope and protection ability of intelligent terminals at the station domain layer, for the power grid as a whole, only through the protection of the station domain layer, its reliability needs to be improved, and it has great limitations

However, the real-time information upload of the whole network in the conventional wide-area differential protection will generate a data flow far exceeding the pre-allocated bandwidth.

Even if a huge amount of money is spent to build a high-bandwidth communication network, based on the network mining and network hopping mode of large-scale information collection and long-distance transmission, massive data will be collected in some key communication hub nodes, and the problem of information congestion is unavoidable

What's more serious is that if a large-scale fault occurs in the system, the sudden traffic will make the communication congestion problem worse. At the moment when the system most needs protection and reliable operation, the performance of the protection system will not increase but decrease, which is in line with the original intention of wide area protection. violated

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