覆冰导线三相短路条件下电动力作用瞬态稳定分析

Transient Stability Analysis of Electrodynamic Action on Iced Conductor Under Three-phase Short Circuit Condition

针对输电线路舞动和输电线路三相短路,基于空气动力学及电动力学的基本理论,对三相短路输电线路的导线舞动进行受力分析,通过从输电导线覆冰、风、电磁力给予的激励,导电线路的参数和结构三方面入手,对覆冰导线舞动时三相短路时短路电流非周期分量和短路时导线磁场进行分析,进而得出短路瞬间电动力变化量,然后结合输电线路的振动形式,得到输电线路在结构、风激励、电动力下耦合振动的动力学方程。通过Matlab编程求解导线耦合振动方程,分别对D形与新月形覆冰导线进行分析,绘制相应时程曲线及质点舞动轨迹,分析覆冰导线在耦合作用下的舞动规律,对试验模型结构进行数值理论计算,并与测量数据进行比较分析,验证理论计算方法的正确性。

Aiming at the problems of galloping and three-phase short circuit of transmission line.Based on the aerodynamics and the basic theory of electrodynamics,three-phase short circuit wires of the transmission line galloping for stress analysis,through the transmission conductor ice coating,wind,electromagnetic force to give incentives,conductive circuit parameters and the structure of the three aspects,the ice galloping wires when three-phase short circuit when the short circuit current aperiodic component and short circuit conductor when the magnetic field were analyzed,and the short circuit instantaneous electric variation are obtained.Then,combining with the vibration form of transmission line,the dynamic equation of coupled vibration of transmission line under structure,wind excitation and electric force is obtained.Wire coupling vibration equation through Matlab programming,respectively analyze the D shape and crescent ice wire,draw the corresponding time history curve and particle trajectory galloping,analysis of ice galloping law of wire under the action of coupling,verifies the correctness of theoretical calculation method,the numerical calculation of test model,and comparing with measurement data analysis.