基于惠更斯原理的电气设备局部放电电磁传播计算方法

doi:10.19595/j.cnki.1000-6753.tces.181375

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摘要为解决放电源大小与设备尺寸不可比拟网格剖分带来的数值计算效率低和内存消耗大的问题,提出一种基于惠更斯原理的计算电气设备局部放电电磁传播方法：第一步将包围放电源的近场空间进行精细化剖分计算得到闭合表面电磁场值;第二步将该电磁场数据作为等效源导入目标域,由于等效源极大地提高了最小空间网格尺寸,从而快速计算得到无源区电磁场传播特性。该文首先以自由空间局部放电电磁传播为例,验证了所提出的等效源模型的准确性与计算效率。最后,利用该方法实现大尺寸、复杂结构的干式变压器内部局部放电电磁传播计算,并得到基于惠更斯原理计算的峰值内存消耗降低为非均匀网格计算的35.45%,计算效率提高了61.68倍。通过算例表明,采用惠更斯原理的计算方法为计算大尺寸电气设备内部局部放电电磁传播规律提供了参考。

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关键词 ：惠更斯原理, 等效源, 局部放电, 电磁传播, 数值计算

Abstract：To solve the problems of low computational efficiency and the large memory consumption caused by the incomparable size of partial discharge (PD) source with equipment in mesh generation, a numerical calculation method for electromagnetic propagation of PD in electrical equipment based on Huygens principle is presented in this paper. The first step is to refine the near-field space of the enclosed discharge source and the closed outer surface electromagnetic field is calculated. In the second step, the electromagnetic field data is imported into the target domain as an equivalent source for calculation. As the mesh size of the target space is greatly increased by using the equivalent source, the propagation characteristics of the electromagnetic field in the passive region can be quickly obtained. To verify the accuracy and efficiency of the proposed method, the electromagnetic propagation of PD in free space is taken as an example. In the end, by calculating the electromagnetic propagation of PD in a large-scale and complex dry-type transformer, the peak memory consumption based on Huygens principle is reduced to 35.45% and the computing efficiency is increased by 61.68 times. The calculation method of Huygens principle provides a method for calculating the electromagnetic propagation of PD in large-scale electrical equipment.

Key words： Huygens principle equivalent source partial discharge electromagnetic propagation numerical calculation

收稿日期: 2018-08-17 出版日期: 2019-11-18

PACS:

TM154

基金资助:国家重点研发项目（2017YFB0902703）和国家111引智基地项目资助

通讯作者: 杨帆男,1980年生,教授,博士生导师,研究方向输变电设备电磁热力耦合场计算与应用等。E-mail: yangfancqu@gmail.com

作者简介: 杨旗男,1990年生,博士研究生,研究方向为电气设备放电多物理场数值计算及其检测评估等。E-mail: yangqi_cqu@163.com

引用本文:

杨旗, 杨帆, 高兵, 黄鑫, 余鹏. 基于惠更斯原理的电气设备局部放电电磁传播计算方法[J]. 电工技术学报, 2019, 34(21): 4419-4427. Yang Qi, Yang Fan, Gao Bing, Huang Xin, Yu Peng. Research on Electromagnetic Propagation of Partial Discharge for Electrical Equipment Using Huygens Principle. Transactions of China Electrotechnical Society, 2019, 34(21): 4419-4427.

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