Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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

A transmission line and reliability technology, applied in the direction of calculation, electrical digital data processing, computer-aided design, etc., can solve the problem that space density or time granularity cannot meet the reliability evaluation of transmission lines, power grid outages, and component failure probability is not considered changes and other issues

Pending Publication Date: 2021-02-05
ZHOUSHAN ELECTRIC POWER SUPPLY COMPANY OF STATE GRID ZHEJIANG ELECTRIC POWER
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Power transmission line time-varying reliability method considering ice force and wind force in freezing weather
  • Power transmission line time-varying reliability method considering ice force and wind force in freezing weather
  • Power transmission line time-varying reliability method considering ice force and wind force in freezing weather

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0099] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0100] Such as figure 1 Shown, the present invention comprises the following steps:

[0101] S1: Construct the ice force reliability model of transmission line based on rainfall, snowfall quality and wind speed;

[0102] The ice force reliability model of the transmission line obtains the total rain and snow mass obtained on the conductor from the vertical rainfall and snow mass and the horizontal rain and snow mass affected by the wind speed, and then solves the mass to obtain the ice force of the conductor load, and correspond to the ice force load and the statistically obtained failure rate; the calculation of the ice force load is shown in formula 1-7:

[0103] The rain / snow mass in the vertical direction is:

[0104] m cz = pδ (1)

[0105] In the formula: p is the rainfall / snow rate (mm / h); δ is the water / snow density (g / cm...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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 ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06Q10/06G06Q50/06G06F113/04G06F119/02
CPCG06F30/20G06Q10/0635G06Q50/06G06F2113/04G06F2119/02
Inventor 虞伟杨天福黄浩夏代军姚斯磊李昊张帆
Owner ZHOUSHAN ELECTRIC POWER SUPPLY COMPANY OF STATE GRID ZHEJIANG ELECTRIC POWER
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com