电气技术  2022, Vol. 23 Issue (7): 89-96    DOI:
电气设备检修与故障诊断 |
基于TLS-ESPRIT算法的变压器油纸绝缘等效电路参数辨识及新特征量提取
苏凯强, 刘庆珍
福州大学电气工程与自动化学院,福州 350108
Parameter identification of oil paper insulation equivalent circuit of transformer and new feature extraction based on TLS-ESPRIT
SU Kaiqiang, LIU Qingzhen
College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108
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摘要 应用介质响应法研究变压器油纸绝缘老化特性过程的关键,是准确地辨识出油纸绝缘等效电路参数和反映绝缘老化程度的特征量。针对现有等效电路参数辨识方法存在的局限性,提出一种相邻奇异值之比定阶的总体最小二乘-旋转矢量不变技术(TLS-ESPRIT)算法,实现对扩展德拜等效电路的参数辨识。首先利用去极化电流构建Hankel矩阵;然后根据收敛前的相邻奇异值之比个数确定弛豫支路数;最后通过TLS-ESPRIT算法辨识出等效电路参数。经仿真和实测验证,该方法可以准确、惟一地实现参数辨识,具有良好的抗噪声能力。进一步地,利用该方法提出2个新特征量:去极化能量初始斜率和去极化能量半衰期,大量实测数据的统计分析表明,新特征量能有效反映油纸绝缘的老化程度。
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苏凯强
刘庆珍
关键词 油纸绝缘总体最小二乘-旋转矢量不变技术(TLS-ESPRIT)算法参数辨识去极化能量老化诊断    
Abstract:The key to study the aging characteristic of oil-paper insulation of transformer by using dielectric response method is to accurately identify the equivalent circuit parameters and the characteristic quantity. Aiming at the limitation of the existing identification methods, a TLS-ESPRIT algorithm based on the ratio of adjacent singular values is proposed. Firstly, the Hankel matrix is constructed by depolarized current. Then the relaxation path number is determined according to the ratio of adjacent singular values. Finally, the equivalent circuit parameters are identified by total least squares-estimation of signal parameters via rotational invariance technique (TLS-ESPRIT) algorithm. Simulation and actual measurement show that this method can accurately and uniquely identify parameters and has good noise resistance. Then, two new characteristic parameters, the initial slope of depolarization energy and the half-life of depolarization energy, are proposed by the method. The statistical analysis shows that the new characteristic parameters can effectively reflect the aging degree of oil paper insulation.
Key wordsoil-paper insulation    total least squares-estimation of signal parameters via rotational invariance technique (TLS-ESPRIT) algorithm    parameter identification    depolarized energy    aging diagnosis   
收稿日期: 2022-01-26     
基金资助:国家自然科学基金项目(61174117)
作者简介: 苏凯强(1997—),男,山东泰安人,硕士研究生,研究方向为电力设备绝缘老化诊断。
引用本文:   
苏凯强, 刘庆珍. 基于TLS-ESPRIT算法的变压器油纸绝缘等效电路参数辨识及新特征量提取[J]. 电气技术, 2022, 23(7): 89-96. SU Kaiqiang, LIU Qingzhen. Parameter identification of oil paper insulation equivalent circuit of transformer and new feature extraction based on TLS-ESPRIT. Electrical Engineering, 2022, 23(7): 89-96.
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