基于模糊-灰色聚类的油纸绝缘状态综合诊断

发布时间：2019-05-08 15:03

【摘要】：变压器油纸绝缘系统在不同测试方法下会得出不同老化特征量,复杂的绝缘状态全面评估存在着一些模糊与不确定问题。因此,建立基于模糊-灰色聚类和组合赋权法的变压器油纸绝缘状态评估模型。首先,建立了多个测试方法下的老化指标评估综合层次图,以层次图为基础,由收集到的变压器绝缘老化指标数据,借助于模糊C-均值聚类(FCM)算法,确定了4级油纸绝缘状态评估老化指标标准状态向量表,同时确定了白化函数阀值;接着,通过主客观意义的组合赋权法给老化特征量赋权,合理地计算出灰色聚类系数;然后,以一级灰色聚类系数作为二级模糊综合评价的隶属度矩阵,搭建出油纸绝缘状态全面评估模型;最后,通过实例验证了新评估方法的有效性与准确性,具有良好的应用前景。
[Abstract]:Different aging characteristics of transformer oil-paper insulation system can be obtained under different testing methods. There are some fuzzy and uncertain problems in the comprehensive evaluation of complex insulation status. Therefore, an evaluation model of transformer oil-paper insulation based on fuzzy-gray clustering and combined weighting method is established. Firstly, the comprehensive hierarchical graph of aging index evaluation under several testing methods is established. Based on the hierarchical graph, the data of transformer insulation aging index are collected, and the fuzzy C-means clustering (FCM) algorithm is used. The standard state vector table of grade 4 oil-paper insulation evaluation index was determined, and the threshold value of whitening function was determined at the same time. Then, the grey clustering coefficient is reasonably calculated by weighting the aging feature by the combination weighting method of subjective and objective significance. Then, taking the first-order grey clustering coefficient as the membership matrix of the two-stage fuzzy comprehensive evaluation, a comprehensive evaluation model of oil-paper insulation state is built. Finally, the validity and accuracy of the new evaluation method are verified by an example, which has a good application prospect.
【作者单位】：福州大学电气工程与自动化学院;
【基金】：国家自然科学基金(61174117)项目资助
【分类号】：TM855

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