| 引用本文: | 刘庆珍,张晓燕,蔡金锭.基于降维技术与K-means聚类的油纸绝缘状态综合灰评估[J].电力系统保护与控制,2019,47(8):62-70. |
| LIU Qingzhen,ZHANG Xiaoyan,CAI Jinding.Comprehensive grey evaluation for oil-paper insulation based on dimension reduction techniques and K-means cluster[J].Power System Protection and Control,2019,47(8):62-70 |
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| 摘要: |
| 针对变压器油纸绝缘单一特征量评估易受多种因素干扰而影响准确性等问题，提出一种基于降维技术与改进K-means聚类的变压器油纸绝缘状态综合灰评估新方法。首先，提出去极化电流谱线末端双点解析法提取3个绝缘老化新特征量。接着，基于特征量的多元评估指标阵，结合组合权重法和降维技术，提出特征量综合指标 。最后，采用基于K-means聚类算法对 构建“好、中、差”3等级的分级数据库并确定等级界限标准表，形成变压器油纸绝缘老化状态灰色聚类评估体系。经若干实例分析证明所提方法能全面、准确地评估绝缘状态。 |
| 关键词: 末端双点解析 极化最大直谱线 组合权重 降维技术 K-means聚类 油纸绝缘状态 |
| DOI：10.7667/PSPC180526 |
| 分类号: |
| 基金项目:国家自然科学基金项目资助(61174117) |
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| Comprehensive grey evaluation for oil-paper insulation based on dimension reduction techniques and K-means cluster |
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LIU Qingzhen,ZHANG Xiaoyan,CAI Jinding
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(College of Electrical Engineering and Automation, Fujian Key Laboratory of New Energy Generation and Power Conversion, Fuzhou University, Fuzhou 350108, China)
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| Abstract: |
| Aiming at the problem that oil-paper insulation aging evaluation accuracy is vulnerable to single characteristic parameter under different circumstance, a new comprehensive gray evaluation method for transformer oil-paper insulation status based on dimension reduction techniques and K-means clustering is proposed. First, a terminal two-point analytical method of depolarization current spectrum is presented to extract three new features of insulation aging. Second, a multivariate evaluation index array is constructed and the comprehensive index Z is refined via a combined weighting method combining with main component dimension reduction techniques. Finally, a hierarchical database of ‘good, middle, and poor’ 3-level for Z is built by weighted Euclidean distance-based K-means clustering algorithm, the level limit standard table for comprehensive index is determined and the grey clustering evaluation system for transformer oil-paper insulation aging state is set up accordingly. The final numerous case analysis proves that the proposed method is comprehensive and accurate to evaluate the insulation state. This work is supported by National Natural Science Foundation of China (No. 61174117). |
| Key words: direct spectrum solution polarization maximum spectrum combination weight dimension reduction techniques K-means cluster oil-paper insulation state |
