第36卷第7期 2015年7月
仪器仪表学报 Chinese Joumal of Seientific Instrument
相对变换主元分析的变压器油击穿电压预测
唐勇波2，彭涛”，熊印国"，江风云
Vol. 36 No. 7 Jul.2015
（1.宜春学院物理科学与工程技术学院宜春336000；2.中南大学信息科学与工程学院长沙410083）
摘要：针对变压器油击穿电压在线测量围难，数据噪声和孤立点影响支持向量机预测精度的问题，提出了基于相对变换（RT）主元分析(PCA)的变压器油击穿电压预测方法。首先，通过相对变换将原始数据空间变换到相对空间，抑制噪声和孤立点对模型精度的影响；然后在相对空间进行主元分析，降低相对空闻维数，使提取的主元特征更具有代表性和更大的变化度；最后，将提取的主元作为最小二乘支持向量机(LSSVM)的输人，建立变压器油击穿电压的最小二乘支持向量机预测模型。与LSSVM
RT-LSSVM和PCA-LSSVM的对比实验结果表明，本文提出的方法具有较优的预测精度和泛化能力。关键调：击穿电压；预测；相对变换；主元分析；最小二乘支持向量机
中图分类号：TP183TH833
文献标识码：A
国家标准学科分类代码：510.80
Breakdownvoltagepredictionmathodfortransformeroilbasedonrelative
transformationprincipalcomponentanalysis Tang Yongbo'.2,Peng Tao’,Xiong Yinguo',Jiang Fengyun
(1. School of Physical Science and Engineering, Yichun University, Yichun 336000, China;2. School of
Information Science and Engineering, Central South University, Changsha 410083, China)
Abstract : Aiming at the problems that it is difficult to measure the breakdown voltage of transformer oil in real time and the data noise and isolated point affect the prediction precision of support vector machine, a new predietion method for the breakdown voltage of trans-former oil based on relative transformation ( RT) principal component analysis (PCA) is proposed. Firstly, the original data space is converted into the relative data space with relative transformation, which suppresses the influence of data noise and isolated point on pre-diction model precision; Secondly, PCA is performed in relative space to reduce the dimension of the relative space, which makes the extracted principal component features have more variability and representation in the relative space; At last, the extracted principal components are used as the input of the least squares support vector machine (LSSVM), and the LSSVM prediction model for the break-down voltage of transformer oil is established. Compared with LSSVM, RT-LSSVM and PCA-LSSVM, the experiment results show that the proposed prediction method has better prediction precision and generalization ability.
Keywords : breakdown voltage; prediction; relative transformation; principal component analysis; least squares support vector machine
用破坏性的击穿实验来测试击穿电压是不经济的，而且
1引言
变压器油作为油浸式大型电力变压器内部绝缘介质，其绝缘品质的好坏严重危及到变压器的安全稳定运行。变压器油击穿电压集中体现了变压器油绝缘性能，
收稿日期：2015-01
Received Date: 2015-01
*基金项目：国家自然科学基金(61273169)项目资助
往往是不可取。因此，分析击穿电压与变压器油日常监测参量关联程度，建立击穿电压的软测量模型进行预测，对于及时发现安全隐患，实现变压器状态检修意义重大。
神经网络[23)以其强大的非线性映射能力，在变压器