相对变换主元分析的变压器油击穿电压预测

Breakdown voltage prediction mathod for transformer oil based on relative transformation principal component analysis

针对变压器油击穿电压在线测量困难,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,降低相对空间维数,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)的输入,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。

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 prediction method for the breakdown voltage of transformer 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 prediction 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 breakdown 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.