基于去极化电流Prony拟合的油纸绝缘德拜参数辨识方法  

Debye Parameter Identification Method of Oil-paper Insulation Based on Depolarization Current Prony Algorithm Fitting

作　　者：高浩 刘庆珍 蔡金锭 GAO Hao;LIU Qingzhen;CAI Jinding(College of Electrical Engineering and Automation,Fujian Key Laboratory of New Energy Generation and Power Conversion Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福州大学电气工程与自动化学院福建省新能源发电与电能变换重点实验室,福州350108

出　　处：《高压电器》2020年第11期210-218,共9页High Voltage Apparatus

基　　金：国家自然科学基金(61174117)项目资助;福建大学科技启动基金(XRC-17043)资助;晋江市福大科教园区发展中心科研项目(2019-JJFDKY-33)资助。

摘　　要：提出一种利用自适应采样间隔Prony算法对去极化电流数据进行拟合,进而辨识出徳拜等效电路参数的方法。根据扩展德拜等效模型下去极化电流指数函数叠加的物理性质,对传统单采样间隔Prony算法进行改进:根据不同大小时间常数去极化电流子谱线的衰减特性实现采样间隔的自适应选择,利用自适应采样间隔对去极化电流数据进行多次Prony拟合,得到相应时间常数的子谱线弛豫参数,进而辨识出油纸绝缘的徳拜电路参数;搭建扩展德拜模型仿真平台得到PDC仿真数据进行拟合,验证了自适应采样间隔Prony算法对徳拜电路参数辨识的准确性,取一台现场实测的油纸绝缘调压器去极化电流数据进行拟合,拟合结果与实测电流吻合,验证了此方法在现场噪声干扰测试条件下的可靠性;对实测数据的拟合结果证实了扩展德拜模型对油纸绝缘介质响应过程描述的准确性,徳拜拟合对现场实测的噪声干扰起到了滤波的作用。An adaptive sampling interval Prony algorithm is proposed to fit the data of depolarization current and identify the parameters of Debye equivalent circuit.According to the physical properties of the exponential function superposition of the depolarized current under the extended Debye equivalent model,the traditional single sampling interval Prony algorithm is improved:the adaptive selection of sampling interval is realized according to the attenua-tion characteristics of depolarized current sublines with different time constants,and the data of depolarized current are obtained by using the adaptive sampling interval.Prony fitting is used to obtain the subspectral relaxation parame-ters of the corresponding time constants,and then identify the parameters of the oil-paper insulation circuit.The sim-ulation platform of extended Dubai model is built to simulate the PDC simulation data,which verifies the accuracy of the adaptive sampling interval Prony algorithm for parameter identification of the Dubai circuit,and a field is select-ed.The fitting results of the measured depolarization current data of oil-paper insulated voltage regulator coincide with the measured current,which verifies the reliability of the method under the condition of field noise interference test.The fitting results of the measured data confirm the accuracy of the extended Debye model in describing the re-sponse process of oil-paper insulated medium.The noise interference measured in the field plays a filtering role.

关 键 词：油纸绝缘 扩展德拜模型 参数辨识 PRONY算法 去极化电流 拟合 采样间隔 

分 类 号：TM855[电气工程—高电压与绝缘技术]