Method for calculating time-variable reliability of power transmission line in freezing weather

A transmission line and calculation method technology, applied in the direction of calculation, electrical digital data processing, instruments, etc., can solve the problem that the frozen meteorological information cannot meet the reliability assessment of the transmission line, and achieve the effect of high-precision weather forecast

Inactive Publication Date: 2015-04-29
STATE GRID CORP OF CHINA +5
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a time-varying reliability calculation method for power transmission lines in freezing weather, so as to solve the problem that the current power grid has freezing weather information that cannot satisfy the reliability evaluation of power transmission lines

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  • Method for calculating time-variable reliability of power transmission line in freezing weather
  • Method for calculating time-variable reliability of power transmission line in freezing weather
  • Method for calculating time-variable reliability of power transmission line in freezing weather

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Embodiment Construction

[0019] The method for calculating the time-varying reliability of transmission lines in freezing weather includes the following steps:

[0020] a) Construction of ice force reliability model of transmission line: through Calculate the total mass of snow or rain hitting the route in freezing weather and pass Calculate the ice thickness increment on the wire, where: m cz = pδ, m sp =0.26V P P 0.88 , p is the rainfall rate or snowfall rate (mm / h), δ is the density of water or snow (g / cm 3 ), V P=0.7kω β (t)V max (m / s), ω β (t)=sinβ(t) is the angle factor, β(t) is the acute angle between the wind direction and the wire, k is the factor affecting the wind speed by terrain, V max is the regional maximum wind speed (m / s) issued by the Meteorological Bureau, δ b is the ice density (g / cm 3 );

[0021] pass Calculation of the ice force load on the wire and the passage λ for the ith hour b =f(L b ) to count the failure rate λ under different ice loads b , where: when 0...

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Abstract

The invention relates to a method for calculating the time-variable reliability of a power transmission line in freezing weather. The method comprises the following steps: constructing an ice force reliability model of the power transmission line, constructing a wind force reliability model of the power transmission line, constructing a sectionalized freezing weather equivalent model of the power transmission line, constructing a freezing weather equivalent model of the power transmission line, constructing a time-variable reliability model of the power transmission line, constructing an outage model of the power transmission line, analyzing a system state, and performing power grid risk assessment. The method has the advantages that by virtue of the steps, time-variant reliability calculation is performed, so that small-size and high-accuracy weather forecast for the power transmission line of a power grid is realized, the forecast accuracy is accurate to a single power facility, more accurate probability calculation reference is provided for the risk assessment on the power transmission line in the freezing weather, meteorologic factors are associated with component failure rate, and since electric system operating state probability inference can be calculated by virtue of the component failure rate, the safety risk assessment of weather on power operation is inferred.

Description

technical field [0001] The invention relates to a calculation method for time-varying reliability of power transmission lines in freezing weather. 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 trips caused by disastrous weather (icing on lines, lightning strikes, strong winds, etc.) account for more than 60% of the total. The weather has a great impact on the reliability of the power grid. Many transmission lines are distributed in mountainous areas, and the temperature in mountainous areas is usually relatively low. Compared with plains, it is more prone to freezing. If micro-meteorological monitoring equipment is installed on all transmission lines, the investment will be huge; Therefore, at present, micro-meteorological monitoring equipment i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 孙维真岳平王超张静张周麟朱培红张磊胡洪涛周苗菲杨承河李琦赵碚任娴婷吴昌王栋刘明康
Owner STATE GRID CORP OF CHINA
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