基于二次时域微分解析法的油纸绝缘介质响应参数辨识  

Parameter Identification for Dielectric Response of Oil-paper Insulation Based on Second Time-differential Analysis

作　　者：蔡金锭[1] 曾静岚 

机构地区：[1]福州大学电气工程与自动化学院,福州350116 [2]国网福建省电力有限公司电力科学研究院,福州350003

出　　处：《高电压技术》2017年第6期1937-1942,共6页High Voltage Engineering

摘　　要：时域介质响应数学模型的合理构建及其参数辨识的准确性对评估油纸绝缘老化状态至关重要。针对原有模型未能真实反映极化过程,引入了微观动力学的线型因子,建立了非典型线型的介质响应函数;首次提出了二次时域微分解析法用于不同弛豫过程的分解,该方法不仅能准确判定极化支路数,而且所提取的谱线特征量,确保了介质响应参数辨识的唯一性。最后,应用该方法对1台220 k V变压器的实测去极化电流曲线进行参数辨识。结果表明,通过改进介质响应数学模型,采用二次时域微分解析法获取的去极化电流曲线与测试曲线更为相符,重合度由传统方法的88.56%提升到97.58%,验证了该方法在油纸绝缘介质响应参数辨识中的适应性和准确性。It is essential to establish a dielectric response mathematical model and identify its parameters exactly for assessing the aging state of oil-paper insulation. Consequently, we adopted the line shape factor of microscopic dynamics to establish a non-typical line shape dielectric response function for the depolarization process not being reflected by conventional model accurately. The second time-differential analysis was firstly proposed to be applied in decomposition of different relaxation processes. This method not only determined branches＇ polarization number accurately, but also ensured the parameter identification uniquely by spectral line characteristics extracted. Finally, the proposed method was used to identify the parameters of depolarizing current curve measured from a 220 kV transformer. The results show that the depolarizing curve by the improved dielectric response model and the second time-differential analysis has better coincidence of 97.58% with the test curve while the conventional one is 88.56%, which verifies the fitness and accuracy of the method on the parameter identification of oil-paper insulation dielectric response.

关 键 词：介质响应 油纸绝缘 参数辨识 二次时域微分解析法 线型因子 极化支路数 

分 类 号：TM855[电气工程—高电压与绝缘技术]