基于matlab架空输电线路电晕放电机理的数值分析毕业设计.doc

基于MATLAB架空输电线路电晕放电机理的数值分析 摘要 不论是直流输电线路还是交流输电线路，当导线表面的电场强度超过空气的击穿强度时，导线表面将出现电晕放电，并随之产生可听噪声、无线电干扰、电视干扰和电晕损失等负效应 。随着输电线路电压等级的不断升高，特别是特高压电网的兴建，使这一问题变得越来越突出。本文所进行的研究只是一种相关理论的初步探索。 本文在研究输电线路的电晕放电形成机理的基础上，利用MATLAB中的偏微分方程(PDE)工具箱数值分析了输电导线表面的电场、电位分布以及不同的外界环境如水滴、空间电荷对输电导线表面电场的影响，同时模拟了超高压500kV四分裂输电导线周围的电场、电位分布。最后定性分析与计算电晕放电时输电线路附近的可听噪声、无线电干扰、电视干扰及电晕损失等。计算结果表明： 本文仅对架空输电线路电晕放电产生的机理和和电晕放电所产生的负效应进行了定性分析，可为超高压输电线路的设计和敷设提供参考。 关键词 架空输电线路；电晕放电；无线电干扰；可听噪声；电晕损失 Numerical Analysis on Corona Discharge Mechanism of Overhead Transmission line Based on MATLAB Software Abstract As the level of transmission line’s voltage continue to increase, Chinas ultra-high voltage(UHV)AC transmission line is being constructed, transmission lines electromagnetic environment question receives peoples attention more and more. No matter is the DC transmission line or the AC transmission line, When the wire surfaces electric-field intensity surpasses the air’s puncture field intensity, the wire surface will present the corona discharge. But taking into account the economic, the transmission line usually designs the permission has certain extent corona discharge under the normal operation voltage. The corona discharge will produce audible noise，radio interference, television interference, corona loss and so on, which would have certain influence to the environment and transmission lines movement. The audible noise, radio interference, television interference and corona loss are closely relevant to the wire surface’s electric field intensity size, and the wire surface’s condition and the weather and so on can influence the wire partial surface electric field intensity. This article first introduces transmission lines corona discharge phenomenon, and introduced the use finite element method(FEM) solution transmission line surface electric field briefly, and using the partial differential equation (PDE) toolboxt in MATLAB to numerical analysis the surface of transmission wire’s electric field and potential dis