油浸式变压器绕组分数阶传输线模型参数辨识的研究  

Research on Parameter Identification of Fractional Transmission Line Model in Oil-immersed Transformer Winding

作　　者：梁贵书[1] 高世强[1] 

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071003

出　　处：《华北电力大学学报（自然科学版）》2016年第5期1-7,共7页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51177048;51407073);河北省自然科学基金(E2012502009);国家电网公司科技项目(超特高压GIS站VFTO对变压器类设备的影响及抑制措施研究)

摘　　要：导线的集肤效应和油纸介电常数的频变特性导致变压器绕组传输线模型的阻抗和导纳参数产生频变。模型中频变参数的准确性对于分析绕组上各处电压分布有重要意义。根据时谐场理论,得出变压器绕组单位长度复电容与复介电常数线性对应关系。在有限元软件基础上得到不同频点下的复电容值,由复电容量拟合模型,求得频变效应下变压器绕组模型中的分数阶导纳参数,同时与考虑导线集肤效应时单位长度阻抗参数结合,进而确定整个模型参数。最后对新参数下的分数阶传输线模型进行仿真计算,同时将其与实际测量值和不考虑参数频变的整数阶模型以及以平行板电容公式为基础确定频变导纳参数的分数阶模型仿真值进行对比,验证所确定分数阶模型参数的准确性。The frequency-dependent characteristics of the impedance parameter and the admittance parameter in the transmission line model of the transformer winding are mainly caused respectively by the skin effect of the conductor and the frequency-dependent characteristics of the complex permittivity of oil-paper. The accuracy of the frequency-dependent parameters of the model is important for the analysis of the voltage distribution on the winding. The linear relationship of the complex capacitance and the complex permittivity is obtained on the base of the time-harmonic field theory.The complex capacitance values of different frequency points are obtained by using the finite element software and the fractional admittance parameters in the model of the transformer windings is derived based on the complex capacitance fitting model. Then the parameter in the fractional transmission line model of the transformer winding is established with the fractional order form of impedance parameters when considering the skin effect of the conductor. Finally,the fractional transmission line model is simulated and calculated with the new parameters,the authors of this paper compared the voltage waveform with experimental measurement and the integer order model without considering the frequency-dependent parameters and the frequency-dependent admittance parameter of the fractional model based on the parallel plate capacitance formula,and then verified the accuracy of the parameters in the fractional model.

关 键 词：油纸 复电容 频变导纳 分数阶模型 

分 类 号：TM864[电气工程—高电压与绝缘技术]