特高压输电线路暂态特征估算方法  

Estimation of transient character for UHV transmission line

作　　者：张波[1] 何奔腾[1] 

机构地区：[1]浙江大学电气工程学院,浙江杭州310027

出　　处：《电力自动化设备》2010年第5期1-5,10,共6页Electric Power Automation Equipment

摘　　要：以实验室主频理论工作为基础对暂态噪声主频分量的特性进行了研究,得出主频与故障距离、系统阻抗成反比,而电流主频分量幅值与其均成正比。通过对暂态特征进行最小二乘拟合提出了一种新的估算方法,能够得到主频和主频分量幅值的解析式,对暂态特征进行直观的估计。仿真和误差分析结果显示,主频的估算误差小于6%,主频分量幅值的估算误差在故障距离小于600km时小于8%,说明该估算方法能较准确地对暂态特征进行定量分析。基于估算方法进一步得到,并联电抗器的存在使得主频增大,幅值减小,对暂态过程有利。而随着电压等级的升高,主频频率减小,而幅值增大,暂态过程愈发严重。Based on the lab research of main frequency theory ,the main frequency component character of transient noise is analyzed,which concludes that：the main frequency is inversely proportional to fault distance and system impedance whereas its current amplitude is directly proportional to them. An intuitive estimation method of transient character is put forward,which gets the analytic expressions of the main frequency and its amplitude by fitting the transient character with the least square method. Simulation and analysis show that,the estimation error of the main frequency is less than 6 % and that of its amplitude is less than 8 % when the fault distance is less than 600 km,which means that the transient character can be analyzed rather accurately and quantitatively. Based on the method,it is further concluded that,the shunt reactor makes the main frequency larger and its amplitude smaller,favorable to transient process, while the increase of voltage grade makes the main frequency smaller and its amplitude larger,harmful to transient process.

关 键 词：电力系统 特高压 故障 暂态噪声 主频 

分 类 号：TM711[电气工程—电力系统及自动化] TM723