文档介绍：华北电力大学(保定)
硕士学位论文
高压直流输电线路电晕放电起始判据研究
姓名:熊高林
申请学位级别:硕士
专业:工学;电磁场与微波技术
指导教师:卢铁兵
2011-03
华北电力大学硕士学位论文
摘要
随着特高压直流输电的快速发展,输电线路带来了一系列的电磁环境问题,
电晕放电是其产生的主要原因之一。本文将模拟电荷法和优化方法相结合,在
验证了优化模拟电荷法的有效性后,计算了输电线路表面及其空间场强分布,
进而分析了钢芯铝绞线的表面粗糙系数。本文在电晕放电模型的基础上,重点
阐述了正、负电晕放电机理,给出了电晕放电起始判据的一般表达式,并用电子
崩头部电子数 Q 的大小来作为电晕起始判据的定量衡量标准。接着,讨论和计
算了临界电子崩数 Q 的取值,并与经典公式进行了比较,证明了选取的 Q 值的
有效性。在实际架空绞线模型的基础上,分析和计算了空间电荷对线路起晕电
压和起晕场强的影响。最后,分析了不同运行方式下高压直流输电线路起晕条
件,计算了单级、双极和双回线路运行方式下分裂导线的起晕电压和起晕场强。本
文的研究成果可为高压直流输电线路工程设计和建设提供参考。
关键词:优化模拟电荷法;电晕放电模型;击穿准则;电晕起始判据;起晕电
压;空间电荷;
I
华北电力大学硕士学位论文
Abstract
With the rapid development of Ultra-High Voltage Direct Current
(UHVDC), a series of ic environment problems are generated due
to the corona discharge. In this paper an optimized charge simulation method
based on bination of optimization method and charge simulation method
(CSM) is used, which is testified to be valid. The electric field distribution of
the conductor surface and space is calculated, then the roughness coefficient of
the Aluminium Conductors Steel Reinforced(ACSR) can be obtained. Based on
the corona dicharge model, the positive and negative corona discharge
mechanism is explained in detail. From different breakdown criteria, the general
expressions of the corona discharge inception criteria are obtained. The
electrons number Q of the electron avalanche head which is a quantitative
measure of the corona onset criteria is discussed, which is proved to be valid by
the classical formula. Based on the practice model of actual power transmission
lines, the effect of avalanche space charge to the corona onset voltage and
corona onset field is analyzed. Finally, corona onset condtions is analyzed under
different operating modes of HVDC transmission lines, such as unipolar,
bipolar and double-circuit transmission lines. The research results can provide
some references to HVDC transmission line design.
Keywords: Optimized charge sim