不同大气参数及表面状况下导线交流起晕电压的预测

Conductor's AC Corona Onset Voltage Prediction Under Different Atmospheric Parameters and Conductor Surface Conditions

导线电晕放电会引起能量损失、无线电干扰、可听噪声等危害。电晕放电存在于诸多电网设备中,以超、特高压线路最为严重。我国西电东送,南北互供,全国联网的电力发展战略决定着我国超、特高压线路必将经过高海拔,不同湿度、污秽环境地区。因此,研究不同大气参数下的导线起晕电压有重要的理论及工程意义。根据电晕筒内导线试验数据,提出了一种基于支持向量回归的导线交流起晕电压预测模型。在一定环境温度下,以相对空气密度、相对湿度、粗糙系数为输入参量,导线的起晕电压为输出建立了预测模型。结果表明:基于留一交叉验证法的支持向量回归模型的预测结果与试验结果符合,该方法为导线的起晕电压的获得提供了一条可能的新途径。

Corona of conductor will cause some harms such as energy loss,radio disturbance,audibility noise and so forth. Corona discharge phenomena exist in many power grid equipments,and it is most serious in EHV and UHV transmission lines. The development strategy of our country including electric energy transmission from west to east,supply electric energy with each other in south and north and a system of on-line electric energy transmission decided that EHV and UHV transmission lines must pass through areas with different altitude,different air humidity and pollution. Therefore,the study of conductor＇s corona onset voltage under different atmospheric parameters has significance in theory and project. According to the test results on conductor in a corona cage,AC corona onset voltage of conductor prediction model based on support vector regression is proposed in this paper. The corona onset voltage of conductor prediction model is established by using relative density and humidity of air in a definite environmental temperature,roughness coefficient as input parameters,and corona onset voltage as outputs. The forecasting result based on support vector regression model under the leave-one-out cross validation method consists with test result. This method supplies a new possible way to acquire corona onset voltage of conductor.