Power grid thunder damage risk evaluation method

Abstract

The invention relates to a power grid thunder damage risk evaluation method. The information of each circuit needing evaluation is adopted to obtain the lightning stroke trip-out rate and the probability value of lightning stroke reclosing success, reclosing failure but forced sending success, and reclosing failure and forced sending failure of each circuit through computer simulation computation, an automatic power grid thunder damage distribution evaluation system is established by a computer on the basis, and quantization evaluation is carried out on damages of power grid power supply and power transmission equipment in allusion to different circuits after lightning stroke trip-out so as to obtain the thunder damage risk evaluation results of a plurality of circuits in the power grid. The method has the advantages that the thunder damage risk evaluation on each circuit in the power grid is based on a power grid thunder damage risk evaluation model, and the lightning stroke trip-out rate is taken as the basis to consider to comprehensively evaluate a series of damages caused on power grid operation and power transmission equipment after lightning stroke trip-out to obtain the evaluation results of thunder damages of each circuit in the power grid. Because the influence of a plurality of factors is fully considered, the power grid thunder damage risk evaluation result is true and reliable.

Description

technical field [0001] The invention relates to the technical field of lightning protection for power grids, in particular to a lightning risk assessment method for power grids, which is applicable to the lightning risk assessment of high-voltage power grids, ultra-high voltage power grids and ultra-high voltage power grids in power systems. Background technique [0002] Lightning disaster is one of the top ten natural disasters. For a long time, lightning faults have been a difficult problem that plagues the safe power supply of the power grid. In recent years, with the rapid development of my country's power system, the capacity of the power supply system has become larger and larger, the grid has become denser, the voltage level has become higher and higher, and the towers of transmission lines have become higher and higher. At the same time, we are facing The new situation and the new problem are that the probability of blackout accidents increases correspondingly, espec...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it only obtains the dangerous lightning current distribution that may cause line tripping, but does not consider the connection between lightning tripping and the safety, stability and loss of power grid operation

Although this method takes into account the impact of differences in lightning activities, topography, tower structures, and insulation configurations on the lightning protection performance of lines, it can also better evaluate the risk of lightning tripping of lines, but the disadvantage is that it does not take into account lightning strikes. Risks to the power grid caused by the subsequent process of tripping

The applicant believes that since lightning tripping is an instantaneous fault in the power system, after a lightning strike occurs and a tripping phenomenon occurs, the usual situation is that the success rate of lightning reclosing is relatively high, and the possibility of lightning tripping turning into a permanent fault Low, the lightning damage loss caused by lightning tripping is not very serious in the case of successful reclosing

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