基于最小二乘支持向量機(jī)的變壓器故障診斷
王逸萍
(江蘇省電力公司檢修分公司,江蘇 無(wú)錫 214001)
摘 要:介紹了一種基于最小二乘支持向量機(jī)(LS-SVM) 的電力變壓器故障診斷方法,將樣本數(shù)據(jù)進(jìn)行歸一化處理,以絕緣油中特征氣體種類(lèi)及其含量為依據(jù)建立變壓器故障診斷LS-SVM 模型,對(duì)模型中的核參數(shù)σ 與懲罰參數(shù)C 進(jìn)行優(yōu)化,并將測(cè)試樣本輸入訓(xùn)練好的LS-SVM 模型,得到診斷結(jié)果。實(shí)例結(jié)果分析表明,LS-SVM 將原先的非線(xiàn)性問(wèn)題轉(zhuǎn)化為求解線(xiàn)性問(wèn)題,即使在小訓(xùn)練樣本的前提下,也能獲得更為準(zhǔn)確的診斷結(jié)果。
關(guān)鍵詞:電力變壓器;故障診斷;最小二乘支持向量機(jī);核函數(shù);氣體分析
中圖分類(lèi)號(hào):TM41 文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):1007-3175(2016)06-0024-04
Fault Diagnosis of Power Transformers Based on
Least Squares Support Vector Machine
WANG Yi-ping
(Jiangsu Electric Power Maintenance Branch Company, Wuxi 214001, China)
Abstract: Introduction was made to a kind of power transformer fault diagnosis method based on least squares support vector machine (LS-SVM). The sample data was carried out normalization processing. On the basis of the characteristic gas type and its content of the insulating oil, this paper established the LS-SVM model of transformer fault diagnose and optimized the nuclear parameter σ and penalty parameter C in the model, putting the test sample into the trained LS-SVM model to obtain the diagnosis results. Experimental results analysis shows that LS-SVM changes the original nonlinear problem into the solution of linear problem and the more accurate diagnosis result could be obtained even under the conditions of small training sample.
Key words: power transformer; fault diagnosis; least squares support vector machine; kernel function; gas analysis
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