On-line transmission line lightning shielding failure trip early-warning method

Abstract

The invention discloses an on-line transmission line lightning shielding failure trip early-warning method. The method comprises the following steps of: performing statistics on historical lightning shielding failure trip information to obtain transmission line lightning shielding failure trip probability distribution by a two-dimensional information diffusion theory and a conditional probability method; selecting radar forecast data, such as echo intensity, echo tops and vertical accumulated liquid water content; establishing a lightning current magnitude prediction model based on a back propagation neural network; and sending real-time early warning and an early warning grade of transmission line lightning shielding failure trip probability according to the predicted lightning current magnitude and the side distance to lightning stroke and by virtue of the transmission line lightning shielding failure trip probability distribution model. According to the real-time forecast data of a meteorological radar, the method provided by the invention can predict the trip probability of a transmission line and send an early warning signal, thereby providing reference for decision-making analysis of grid dispatching operators, making a transmission line dispatching strategy in time, improving power supply reliability, lowering economic loss of a grid, and improving the reliable running ability of the grid.

Description

technical field [0001] The invention relates to an online early warning method for lightning shielding and tripping of a power transmission line, belonging to the field of lightning protection for electric power systems. Background technique [0002] Lightning is a weather phenomenon of transient large current, high voltage, and strong electromagnetic radiation that occurs in the atmosphere, usually accompanied by strong convective weather processes. The operation experience of the power system shows that during the process of lightning current intrusion into the power grid, it may cause electrical disturbances such as short circuit and flashover, which will affect the safe and stable operation of the system. Devices are becoming more and more dangerous. For domestic transmission lines with a voltage level of 500kV and below, lightning tripping accidents account for 50% of the total tripping accidents, while for UHV transmission lines, this proportion increases to 75%-90%. ...

AI Technical Summary

Problems solved by technology

[0003] The traditional research focus is mainly on the evaluation method of transmission line shielding, which provides a basis for the lightning protection design of transmission lines, and rarely involves real-time early warning of lightning disasters on transmission lines.

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