基于频域介电谱的油纸绝缘宽频等效模型参数辨识研究

doi:10.19595/j.cnki.1000-6753.tces.170043

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摘要为充分解释频域介电谱（FDS）的测量结果,并为提取油纸绝缘状态特征量提供基础,基于扩展德拜模型（EDM）,提出一种利用FDS曲线辨识EDM各支路阻容参数的有效方法。采用两支经不同程度模拟受潮处理后的真型油纸电容式套管,首先测量其FDS曲线,并通过遗传算法与Levenberg-Marquardt算法相结合的融合方法进行EDM的参数辨识,有效解决了EDM对FDS重构匹配度差的问题,进而建立在10^-3~10³Hz量级范围内的油纸绝缘宽频介电响应等效模型。进一步采用模型参数转换得出时域中的回复电压法（RVM）谱图,并通过对比实测RVM谱图,最终验证该参数辨识方法同时具有良好的时频域一致性,可为进一步开展油纸绝缘状态的定量评估提供依据。

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关键词 ：油纸绝缘, 频域介电谱, 扩展Debye模型, 参数辨识

Abstract：To provide underlying knowledge for interpretation of frequency domain spectroscopy (FDS) measurements and characterization of oil-impregnated paper (OIP) insulation status, FDS propertieswere investigated first in this paper based on the extended Debye model (EDM). In particular, a method was proposed to determine values of the resistor and the capacitor in each branch of the EDM using FDS curves. First, two real-life OIP condenser bushings were employed, in whichmoistureingresswas simulated at different levels, and the FDS curves of the two bushings were measured. Thereafter, a fusion method integrating the genetic and Levenberg-Marquardtalgorithms was employed to calculate the model parameters, which solves the problem of pool matching between the EDM and FDS. In this sense, a wide-band model (in the frequency orders between 10^-3~10³Hz)of dielectric response of OIP insulation has been established. Further, the recovery voltage method (RVM) curves of the two bushingsweretransformed from the resulted EDM. By comparative analysis with the measured RVM results, the proposed method is proven to feature good universality in time and frequency domain. This work presents indications for the quantitativeassessment of OIP insulation condition as further research.

Key words： Oil-impregnated paper insulation frequency domain spectroscopy extended Debye model parameter identification

收稿日期: 2017-01-12 出版日期: 2018-03-14

PACS:

TM855

基金资助:国家自然科学基金创新研究群体科学基金资助项目（51321063）

通讯作者: 杜林男,1971年生,博士,教授,研究方向为电气设备绝缘在线监测及故障诊断。E-mail: dulin@cqu.edu.cn

作者简介: 杨峰男,1990年生,博士研究生,研究方向为电气设备绝缘在线监测及故障诊断。E-mail：yangfeng@cqu.edu.cn

引用本文:

杜林, 杨峰, 蔚超, 王有元, 吴雄, 冉鹂蔓. 基于频域介电谱的油纸绝缘宽频等效模型参数辨识研究[J]. 电工技术学报, 2018, 33(5): 1158-1166. Du Lin, Yang Feng, Wei Chao, Wang Youyuan, Wu Xiong, Ran Liman. Parameter Identification of the Wide-Band Model of Oil-Impregnated Paper Insulation Using Frequency Domain Spectroscopy. Transactions of China Electrotechnical Society, 2018, 33(5): 1158-1166.

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