作者：王昕1,2, 曹文彬3, 曹敏1,2, 赵旭1,2, 赵艳峰1,2, 李翔1,2, 蒋婷婷1,2, 田猛3, 王先培3
作者单位：1. 南方电网电能计量重点实验室, 云南 昆明 650217;
2. 云南电网有限责任公司电力科学研究院, 云南 昆明 650217;
3. 武汉大学电子信息学院, 湖北 武汉 430072
关键词：互感器;故障诊断;反正切变换;主元分析法;核极限学习机
摘要：
针对当前互感器故障诊断算法的准确率不高的问题，提出基于主元分析法核极限学习机（principal components analysis- kernel extreme learning machine，PCA-KELM）和反正切变换（arctangent transform，AT）的互感器故障诊断方法。AT可以改变互感器故障的数据结构，重新调节电压电流等数据的相关比例；PCA提取数据特征，不仅可以减小其维数，还可以保留所需的识别信息；KELM算法能够利用其结构参数来逼近非线性函数，且无需设定网络隐含层节点。通过构建互感器诊断模型，并给出互感器测量参数，将KELM和PCA相互结合对数据进行仿真。将所提出的方法分别与支持向量机（support vector machine，SVM）和原始的ELM的性能进行比较。仿真结果表明：所提出的互感器故障诊断方法在诊断精度上均优于SVM和ELM，且诊断速度同ELM相当，较SVM有明显提升，故障诊断准确率达到98.53%，可为故障信息有限情况下的互感器故障诊断提供参考。
Transformer fault diagnosis based on PCA-KELM and AT
WANG Xin1,2, CAO Wenbin3, CAO Min1,2, ZHAO Xu1,2, ZHAO Yanfeng1,2, LI Xiang1,2, JIANG Tingting1,2, TIAN Meng3, WANG Xianpei3
1. Key Laboratory of Energy Metering of Southern Power Grid, Kunming 650217, China;
2. Electric Power Research Institute, Yunnan Power Grid Co., Ltd., Kunming 650217, China;
3. School of Electronic Information, Wuhan University, Wuhan 430072, China
Abstract: The accuracy rate of the current transformer fault diagnosis algorithm is not high, a transformer fault based on principal component analysis-kernel extreme learning machine (PCA-KELM) and arctangent transform (AT, arctangent transform) diagnosis method is proposed. Here, AT can change the data structure of transformer faults, re-adjust the correlation ratio of voltage and current data, PCA can extract data features not only can reduce its dimension, but also retain the required identification information, KELM algorithm can use it Structural parameters to approximate nonlinear functions without the need to set network hidden layer nodes. By constructing a transformer diagnostic model and giving the transformer measurement parameters, the KELM and PCA are combined to simulate the data. The proposed method is compared with the performance of the support vector machine (SVM) and the original ELM. The simulation results show that the proposed transformer fault diagnosis method is superior to SVM and ELM in diagnosis accuracy, and the diagnostic speed is comparable to ELM, which is significantly improved compared with SVM. The accuracy of fault diagnosis reaches 98.53%, which can be limited for fault information. Provide a reference for transformer fault diagnosis.
Keywords: transformer;fault diagnosis;arctangent transform;principal components analysis;kernel extreme learning machine
2019, 45(11):72-78 收稿日期: 2018-09-27;收到修改稿日期: 2018-12-11
基金项目: 云南电网公司重点项目（YN2014-2-001）
作者简介: 王昕(1969-),女,云南昆明市人,高级工程师,从事电能计量等领域的研究
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