基于凝聚层次聚类的接地网定向支路减维腐蚀诊断优化方法  

Optimization Method for Dimension-reduction Corrosion Diagnosis of Directional Branch of Grounding Grid Based on Condensation Hierarchical Clustering

作　　者：谢炀 杨鑫[1] 黄亚飞[1] 朱子茵 黎昊聪 胡君瑶 XIE Yang;YANG Xin;HUANG Yafei;ZHU Ziyin;LI Haocong;HU Junyao(School of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学电气与信息工程学院,长沙410114

出　　处：《高电压技术》2024年第4期1723-1730,共8页High Voltage Engineering

基　　金：国家自然科学基金(52177015);湖南省自然科学基金(2021JJ30725)。

摘　　要：为了更有效地对接地网水平支路导体的腐蚀故障情况进行诊断,采用模型仿真方法对基于电网络理论的接地网腐蚀诊断方法进行分析,针对现有接地网腐蚀诊断模型存在的缺陷,提出了一种基于凝聚层次聚类的接地网定向支路减维腐蚀诊断优化方法。该方法通过分析恒定直流激励下接地网各支路电阻变化对于端口的灵敏度规律,利用支路端口灵敏度对接地网可及端口进行凝聚层次聚类,以选出最优端口测量组合;然后采用定向支路减维方法对各端口电阻方程进行支路筛选,将灵敏度低于判定阈值的导体支路划为未知支路,高于判定阈值的导体支路划为健康支路,以降低腐蚀诊断模型的病态程度和计算维度。在某模拟变电站接地网上对该方法进行了仿真验证,结果显示优化后的整体诊断相对误差仅为3.07%,远小于普通接地网腐蚀诊断的6.74%,证明该方法能显著提高接地网腐蚀诊断精度,可为接地网腐蚀诊断提供理论指导。In order to more effectively diagnose the corrosion fault of a horizontal branch conductor of grounding grid,in this paper,the model simulation method is adopted to analyze the corrosion diagnosis method of grounding grid based on electrical network theory,and an optimization method for dimension-reduction corrosion diagnosis of directional branch of grounding grid is proposed based on condensation level clustering in view of the defects of the existing grounding grid corrosion diagnosis model.By this method,the sensitivity law of the resistance changes of each branch of the grounding grid to the ports is analyzed under constant DC excitation,and the sensitivity of the branch ports to cluster the ports accessible to the grounding grid is adopted to select the optimal port measurement combination.Then,the directional branch dimensionality reduction method is used to screen the branches of each port resistance equation,the conductor branch with sensitivity lower than the judgment threshold is classified as unknown branch,and the conductor branch with higher than the judgment threshold is classified as healthy branch,so as to reduce the morbidity degree and calculation dimension of the corrosion diagnosis model.The method is simulated on the grounding network of a simulated substation.The results show that the relative error of the optimized overall diagnosis is only 3.07%,which is much less than 6.74%of the corrosion diagnosis of ordinary grounding grid.It is proved that the method can be adopted to significantly improve the accuracy of grounding grid corrosion diagnosis and provide theoretical guidance for grounding grid corrosion diagnosis.

关 键 词：接地网 腐蚀诊断 支路端口灵敏度 凝聚层次聚类 定向支路减维 

分 类 号：TM862[电气工程—高电压与绝缘技术]