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Nonlinear dynamic analysis method for UHV transmission lines under wind vibration excitation

A non-linear dynamics, transmission line technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of safe operation of power systems, power failures, transmission line failures, etc., to achieve good economic benefits, suitable for Wide-ranging, intuitive effects

Active Publication Date: 2018-06-08
STATE GRID HENAN ELECTRIC POWER COMPANY ZHENGZHOU POWER SUPPLY +2
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Problems solved by technology

Any problem with a string of insulators will cause a failure of the transmission line, and in severe cases, it will cause a long-term power outage, which will cause great harm to the safe operation of the power system and people's daily life

Method used

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  • Nonlinear dynamic analysis method for UHV transmission lines under wind vibration excitation
  • Nonlinear dynamic analysis method for UHV transmission lines under wind vibration excitation
  • Nonlinear dynamic analysis method for UHV transmission lines under wind vibration excitation

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Embodiment Construction

[0041] A method for nonlinear dynamic analysis of UHV transmission lines under wind vibration excitation, comprising the following steps:

[0042] a. Use the linear filtering method to construct the wind field, and apply the linear filtering method The model simulates the time history of wind speed, abstracts the random process as white noise satisfying the given conditions, and then performs appropriate transformation through a hypothetical system to fit the time domain process of the process;

[0043] b. Divide a section of the transmission line into N units on average, specifically select N-1 simulation points, and use the linear filtering method to simulate the wind speed time history curve of the selected simulation points;

[0044] c. Use the spectral function to check the wind speed time history curve of the above simulation points. It can be known that the target spectrum is basically close to the simulated spectrum of the spectral density, and the result of the simul...

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Abstract

The invention discloses a nonlinear kinetic analysis method for an ultrahigh voltage transmission line under the action of wind vibration excitation. The method comprises the steps that firstly, the wind velocity time series is simulated by applying an AR model in a linear filtering method; secondly, wind velocity time series curves of simulating points are verified with a spectral function, and the conclusion that a numerically simulated fluctuating wind velocity is basically matched with an actual wind velocity is obtained; thirdly, a kinetic equation of a transmission line system is solved through a direct numerical integration method and a nonlinear modal theory, the wind velocity time series curves of part of the simulating points are obtained, the time series curves solved by the two methods are compared through a power spectrum, the fact that the power spectrum of the time series curves obtained through modal superposition and synthesis is better matched with the power spectrum which is directly solved can be obtained, and the result indicates that the transmission line dynamic response time series curve solved through modal synthesis is reliable. According to the nonlinear kinetic analysis method for the ultrahigh voltage transmission line under the action of wind vibration excitation, the characteristics of fluctuating wind are determined through the two modes, the characteristics of the fluctuating wind can be determined, and a theory and reference basis is supplied to static and dynamic engineering design of the ultrahigh voltage transmission line.

Description

Technical field: [0001] The invention relates to a research on dynamic characteristics of transmission line insulators, in particular to a nonlinear dynamic analysis method of UHV transmission lines under wind vibration excitation. Background technique: [0002] In the design and construction of UHV transmission line engineering, there are many key technical issues including overvoltage and insulation coordination, pollution resistance characteristics, lightning protection characteristics, line environment, equipment development, operation and maintenance, etc. Construction problems such as foundations are different from previous high-voltage or ultra-high-voltage transmission lines, and urgently need to be studied and solved. One of them is the static and dynamic dynamic characteristics of multi-connected insulator strings for UHV transmission lines, the cause of wind vibration and the suppression technology. [0003] Insulators are an essential part of high voltage transmi...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 张伟政蔡裕辛军季国剑杨兰均刘富荣金峰李陵李蒙牛继涛冯帆
Owner STATE GRID HENAN ELECTRIC POWER COMPANY ZHENGZHOU POWER SUPPLY
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