Method for ranking fault risks of high-voltage power transmission lines by taking real-time weather thunderstorm information into consideration

Abstract

The invention discloses a method for ranking fault risks of high-voltage power transmission lines by taking real-time weather thunderstorm information into consideration. The method comprises the following steps that data integration is conducted on the basis of a Neo4j graph database, an equipment mapping table is established according to topological structure features of a power grid, a power grid thunder and lightning information system, a fault information system and historical weather information data are integrated, thunderbolt sections and non-thunderbolt sections of each line can be obtained by means of a traversal algorithm, and mathematical statistical laws are obtained by mining historical data of a grid structure model; according to future numerical weather prediction, dynamic search is conducted to provide the probabilities of lightning trip, namely the fault risk degrees, of the lines of different voltage classes of the south power grid in next few days, and a to-be-selected fault set is obtained by ranking the probabilities. According to the method, quantitative analysis can be conducted on the fault risk degrees of the lines, and compared with former methods only relying on experience of operating personnel, the method has better engineering practicability during operating scheduling, planning and designing of the practical power grid.

Description

technical field [0001] The invention relates to the field of high-voltage power transmission, in particular to a method for ranking fault risks of high-voltage power transmission lines considering real-time meteorological thunderstorm information. Background technique [0002] The power network is one of the most complex artificial networks in the world at present. The operation process of the power grid has great uncertainty, and the probability of failure is also high. In recent years, there have been large-scale cascading failures caused by initial failures in power grids, which have caused huge economic losses. [0003] The cause of cascading faults in the power grid is more complicated. Simply put, the mechanism is that each component of the power grid has a certain initial load when it is in normal operation. Change the balance of the power flow and cause the load to be redistributed on other nodes, and transfer the excess load to other components. If these components...

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Problems solved by technology

[0004] At present, the selection methods for the initial fault set of cascading faults are divided into random sampling method, manual designation method and screening method based on fault consequences. The off-line analysis method is mainly used to analyze it, and the influence of real-time meteorological conditions on the initial fault set of the line is not considered. However, in the actual operation of the power grid, various natural disasters or severe weather conditions may cause cascading failures in the system

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