基于支持向量机的棒-板空气间隙击穿电压预测方法及其应用

发布时间：2018-03-31 09:47

本文选题：棒-板空气间隙　切入点：极不均匀电场　出处：《电工技术学报》2017年19期

【摘要】：空气间隙的击穿电压与放电起始前的电场分布特征存在多维非线性关系。为了实现空气间隙的击穿电压预测,以电场特征集作为输入,以间隙在加载电压下是否击穿作为输出,采用支持向量分类机建立击穿电压预测模型。针对极不均匀电场空气间隙的击穿特性受电晕影响的问题,提出两种修正方法:通过增加受电晕影响的训练样本数据,提高预测模型的泛化性能;或基于"电晕云"的思想进行二次电场计算及特征量提取,对预测模型的输入特征进行修正。采用修正后的模型对极不均匀电场下棒-板间隙的工频击穿电压及棒-板长空气间隙的操作冲击放电电压进行预测,预测值与试验值吻合良好。该方法有利于减少试验次数,降低试验成本。
[Abstract]:In order to predict the breakdown voltage of air gap, the electric field characteristic set is taken as input, and whether the gap is broken under the loading voltage is taken as output, in order to predict the breakdown voltage of air gap, there is a multidimensional nonlinear relationship between the breakdown voltage of air gap and the distribution of electric field before the beginning of discharge. The breakdown voltage prediction model is established by using support vector classifier. Aiming at the problem that the breakdown characteristics of air gap in extremely uneven electric field are affected by corona, two correction methods are proposed: by increasing the training sample data affected by corona. To improve the generalization performance of the prediction model, or to calculate the secondary electric field and extract the characteristic quantity based on the idea of "corona cloud", The input characteristics of the prediction model are modified. The modified model is used to predict the power frequency breakdown voltage of the rod-plate gap and the operating impulse discharge voltage of the rod-plate long air gap under extremely inhomogeneous electric field. The predicted value is in good agreement with the experimental value, and this method is helpful to reduce the number of experiments and reduce the cost of the test.
【作者单位】：武汉大学电气工程学院;国网福建省电力有限公司电力科学研究院;
【基金】：中国博士后科学基金资助项目(2016M602354)
【分类号】：TM85

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