基于先验知识的弓网接触电阻预测模型精度提升方法  

Accuracy Improvement Method of Pantograph Contact Resistance Prediction Model Based on Prior Knowledge

作　　者：时光[1] 陈翼喆 李莹[1] 张国威 Shi Guang;Chen Yizhe;Li Ying;Zhang Guowei(Faculty of Electrical and Control Engineering Liaoning Technical University Huludao 125105,China)

机构地区：[1]辽宁工程技术大学电气与控制工程学院,葫芦岛125105

出　　处：《电工技术学报》2024年第14期4535-4546,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金项目(51477071);辽宁省教育厅面上项目(LJKMZ20220675)资助。

摘　　要：高速列车的运行实践表明,随着运行速度提高,受电弓与接触导线分离的可能性越大,越容易产生弓网电弧。导致电弧产生的因素很多,但最终都归结到滑板与接触网的接触电阻上。首先利用滑动电接触实验机,研究了波动载荷、滑动速度和接触电流对接触电阻的影响,并进一步结合表面形貌特征,分析了磨损机制、电弧放电与接触电阻演变规律之间的关系。其次为了预测不同工况下的接触电阻,建立了径向基(RBF)神经网络回归模型,通过在模型训练中融入先验知识和采用改进的食肉植物优化算法(ICPA)优化RBF神经网络超参数,提升弓网接触电阻预测模型的精度。有、无先验知识的ICPA-RBF模型预测性能对比仿真结果表明,两类先验知识分别有助于提高模型的收敛速度和预测精度。最后采用假设检验验证了模型的有效性。High-speed trains acquire electrical energy through sliding contact between the pantograph and catenary.Good current-collection performance between the pantograph and the contact wire is necessary for the safe and stable operation of the train.The probability of electric arc generation increases with the development of electric locomotives towards high-speed and heavy loads.Numerous factors contribute to generating electric arcs,but these ultimately stem from the contact resistance between the slider and the contact wire.It is essential to establish an accurate prediction model for contact resistance based on analyzing its characteristics.However,the analysis and modeling of contact resistance characteristics were isolated in previous research.This paper applies the conclusions from the mechanism analysis as prior knowledge to the modeling process of contact resistance.Methods for improving the accuracy of the contact resistance prediction model are explored.First,the universal conclusions in previous research on electrical contact are summarized.(1)As the contact pressure increases,the contact resistance decreases.(2)Temperature rise significantly affects contact material properties,wear mechanisms,and wear surface morphology,which can be considered an independent variable.Considering that the temperature of the contact core of the friction pair is not easy to measure and the conductive current loss is closely correlated with temperature rise,the conductive current loss as an independent variable can be used to replace the temperature rise.Subsequently,the effects of fluctuating load,sliding speed,and contact current on contact resistance are studied through the sliding electrical contact experiment machine.The relationship between wear mechanism,electric arc discharge,and contact resistance evolution is analyzed with surface morphology.The following conclusions are drawn.(1)As the fluctuating load increases,electrical contact stability weakens,mainly impacting contact resistance.(2)As the contact current increa

关 键 词：接触电阻 先验知识 径向基(RBF)神经网络 食肉植物算法 假设检验 

分 类 号：TM501[电气工程—电器]