多物理因素影响下的高海拔特高压直流输电线路电磁环境预测

摘要

The corona discharge phenomenon of UHVDC transmission line in high altitude area is very complicated,it is affected by line parameters,meteorological parameters,conductor surface electric field distribution and many other external factors. On one hand, the existing UHVDC transmission line electromagnetic environment parameter prediction formula is the empirical formula obtained in low altitude and standard atmospheric conditions,on the other hand,the influence of meteorological factors are ignored. Based on the massive amounts of electromagnetic environment data tested in the past six years in the National Engineering Laboratory for UHV Technology (Kunming),the big data processing method (i.e. LASSO LME method)is introduced to establish the prediction formu-la,which can calculate the electromagnetic environment parameter considering the comprehensive physical factors of wind speed,tem-perature,relative humidity and the circuit parameters of UHVDC transmission line. At last,the accuracy and applicability of the for-mula is verified by comparison between traditional forecasting formula and experimental data.%高海拔地区特高压直流输电线路的电晕放电现象异常复杂，受到线路参数、气象参数以及导线表面电场分布等诸多外界因素影响。现有特高压直流输电线路的电磁环境参数预测公式一方面是在低海拔、标准大气条件下获得的经验公式，另一方面忽略了环境气象因素的影响。本文基于特高压工程（昆明）国家工程实验室为期六年的海量直流试验线段电磁环境测试数据，引入LASSO-LME大数据处理方法，建立了综合考虑风速、温度、相对湿度、线路参数等多物理因素的特高压直流输电线路电磁环境参数预测公式，并将之与传统预测公式和实测数据进行对比，验证了其精确性与适用性。