基于Davidson-Cole模型与异方差检验的定子绝缘频域介电谱分析  

Spectrum analysis of stator insulation based on Davidson-Cole model and heteroscedasticity test

作　　者：赵德宇 石颉 ZHAO De-yu;SHI Jie(School of Electronics and Information Engineering, Suzhou University of Science and Technology, Suzhou 215009,China)

机构地区：[1]苏州科技大学电子与信息工程学院,江苏苏州215009

出　　处：《电工电能新技术》2021年第9期71-80,共10页Advanced Technology of Electrical Engineering and Energy

摘　　要：针对多弛豫介电响应模型拟合困难、检验方式单一的问题,以电机定子绝缘为试验对象,对其频域介电响应曲线成分进行了分析,结合Davidson-Cole介电弛豫模型与遗传算法实现了模型参数的最优化求解,以异方差检验对拟合结果进行了显著性检验,最后对极化与电导的温度特性进行了深入研究。结果表明,决定系数不能作为多弛豫介电响应模型拟合优劣的充要条件,遗传算法结合异方差检验能够对介电响应模型参数进行有效求解并确保模型显著性,定子绝缘的极化与电导符合势垒与过渡态理论。In order to solve the problem that the intricate dielectric response curve with multiple relaxation/conductance superposition is difficult to fit and the test method is single,motor stator insulation is taken as the test object and the dielectric response curves in frequency Spectroscopy domain are obtained.First of all,the component analysis of the dielectric response curve is carried out,then the optimal solution of model parameters is achieved by combining Davidson-Cole dielectric relaxation model and genetic algorithm,the heteroscedasticity test is used to test the fitting results.Finally,the temperature characteristics of polarization and conductance are discussed in depth.The results show that the determination coefficient cannot be used as a necessary and sufficient condition for the fit of multiple re-laxation dielectric response models.Genetic algorithm combined with heteroscedasticity test can effectively solve the parameters of the dielectric response model and ensure the significance of the model.The polarization and conductance of the dielectric response of stator insulation conform to the transition state and potential energy barrier theory.

关 键 词：介电响应 电机定子绝缘 Davidson-Cole模型 异方差检验 势垒与过渡态 

分 类 号：TM855[电气工程—高电压与绝缘技术]