摘要
通过对GIS内4种典型绝缘缺陷的物理模型试验,获得大量的PD超高频信号数据。对获取的,n-u-t三维谱图样本数据,用统一化和归一化的方法得到对应的二维散点图,采用高斯函数构建4种常见绝缘缺陷的数学模型,总结出构造原则和方法。用定义的误差判定系数、根的均方误差值来定量分析模型的误差,通过功率谱相似性参数NCC的定量计算和时频域SPWVD分析以及人工加噪后用复小波变换技术去噪的应用研究,进一步证明该数学模型可用于GIS中PD超高频仿真研究。最后指出只要适当地调节数学模型中的参数值,就适合于不同绝缘缺陷所对应的物理模型。
Using Ultra-high frequency （UHF） method, a lot of data for partial discharge （PD） is acquired based on four physical models of typical defects in Gas Insulated Switchgear （GIS）; And then the unified and normalized Lorenz plot is made through n-u-t three dimensional maps according to sampling data; Furthermore, the corresponding mathematical models are established with Gaussian function, and the principles and methods of establishment are summarized. R-Square and RMSE are used to describe fitting error quantificationaUy, the results show that the methods and steps for establishing the mathematical model are justified by quantificational calculation for the similarity of power spectrum, SPWVD analysis, and the application of de-noising using complex wavelet. Results also show that the UHF mathematical model can facilitate theoretical simulation to different insulating defects by adjusting the parameter value of the mathematical model.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2006年第8期99-105,共7页
Proceedings of the CSEE
基金
国家自然科学基金项目(50377045)
国家电网公司重庆电力重点项目(2004-SGKJ)~~
关键词
气体绝缘电器
局部放电
超高频
数学模型
定量分析
gas insulated switchgear
partial discharge
ultra-high frequency
mathematical model
quantitative analysis
