Power transmission line time-varying reliability method considering ice force and wind force in freezing weather

Abstract

The invention discloses a power transmission line time-varying reliability method considering ice force and wind force in freezing weather, and relates to the field of electric power operation and maintenance. At present, the small-scale and high-precision element fault probability of a power transmission line cannot be calculated. A power transmission line wind power reliability model is established, then an ice power and wind power reliability model is integrated to obtain a power transmission line segmented freezing weather equivalent model, and a power transmission line overall freezing weather equivalent model is obtained according to the power transmission line frozen weather segmented equivalent model and the length of a line where the model is located; a time-varying reliability model of the whole power transmission line within a period of time is obtained along with time changes, and then a power transmission line outage model is obtained; and finally, the system state is analyzed according to the outage model, and the risk of the power grid in the state is evaluated. According to the technical scheme, small-scale and high-precision weather forecast of the power transmission line of a power grid is realized, the forecast precision can be accurate to a single power facility, and a more accurate probability calculation basis is provided for risk assessment of the power transmission line in freezing weather.

Description

technical field [0001] The invention relates to the field of electric power operation and maintenance, in particular to a method for time-varying reliability of transmission lines in freezing weather considering ice force and wind force. Background technique [0002] my country is a country with a relatively high incidence of natural disasters. Local power outages in power grids caused by natural disasters occur from time to time. Disastrous weather has a serious impact on the power grid. Statistics show that the trips caused by disastrous weather (ice covering lines, lightning strikes, strong winds, etc.) account for more than 60% of the total. In 2008, the southern ice disaster caused large-scale damage to the power grids of many provinces and cities, resulting in partial power outages; freezing weather had a greater impact on the reliability of the power grid, and many transmission lines were distributed in mountainous areas, and the temperature in mountainous areas is ...

AI Technical Summary

Problems solved by technology

In 2008, the southern ice disaster caused large-scale damage to the power grids of many provinces and cities, resulting in partial power outages; freezing weather had a greater impact on the reliability of the power grid, and many transmission lines were distributed in mountainous areas, and the temperature in mountainous areas is usually relatively low, which is easier than in plains. In the event of freezing, if micro-meteorological monitoring equipment is installed on all transmission lines, the investment will be huge; therefore, at present, micro-meteorological monitoring equipment is only installed on some transmission lines; the weather forecast information provided by the existing meteorological department is not yet accurate. For a single power facility (such as a pole tower), the spatial density or time granularity cannot meet the needs of transmission line reliability assessment

[0003] At present, the research on the reliability changes of transmission lines caused by freezing weather is not sufficient. The existing research does not take into account the changes in the component failure probability of transmission line sections at different times and in different locations. It is greatly affected by meteorological information and cannot Realize small-scale, high-precision component failure probability calculation of transmission lines

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