Abstract
The transmission lines are exposed to the atmosphere nature and will be affected by adverse weather such as lightning storm, so that it will affect the reliability of transmission system. This paper studies the fault probability model of transmission line during the lightning storm, and evaluates the short-term reliability of transmission system in the forecasting weather condition. Firstly, build the lightning strike fault probability model of the transmission line based on historical lightning record information, then calculate the lightning strike probability under the forecasting weather conditions, furthermore evaluate the reliability index of transmission system. Utilizing IEEE RTS-79 system to verify the validity of the proposed model and the results show that lightning has great negative influence on the transmission lines and the reliability of transmission system. The reliability evaluation model proposed in this paper can guide the short-term operation and online scheduling for transmission system operators.
Highlights
Overhead transmission lines are exposed to nature for a long time, so they are affected by adverse weather
For transmission lines of 500 kV and below, lightning trip accidents account for 50% of the total trip accidents [1], and for UHV transmission lines, the proportion increases to 75% - 90% [2]-[4]
The influence of lightning strike failure on reliability of transmission line is studied in this paper, and the shortterm reliability evaluation model of power system under lightning weather is presented
Summary
Overhead transmission lines are exposed to nature for a long time, so they are affected by adverse weather. Statistics show that with the expansion of power grid, the harm of fault caused by lightning on transmission lines and electrical equipment is more and more great. Literature [9] simulates the influence process of large-scale ice disaster to transmission system with the meteorological model that changes over time, and calculates the reliability index. This paper establishes a model to calculate the lightning strike failure probability of transmission line from the perspective of probability, based on lightning weather information, and to predict the lightning strike failure probability of lines under thunder weather, to study the effect of lightning strike probability on the short-term reliability of power system
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