摘要
对三相输电线动力系统进行了耦合减振试验研究。选择湖南省某220 kV输电线路作为工程原型,设计制作了三相耦合输电线路的动力相似试验模型、刚度可调的相间间隔棒以及时延加载装置。对于三相耦合的非线性多振子动力系统,全面考虑耦合强度、时间延迟和频率错配等影响因素,通过调整模型结构参数或采用延迟激励措施,使整个系统处于一种微幅振动的最优状态,从而实现三相输电线路的耦合减振。试验结果表明,随着时延参数和耦合强度的增大,动力系统依次出现振幅下降-微幅振动-振幅上升3个参数区间,稳定且有一定分布跨度的微振区间为输电线路的耦合减振控制提供了便利。增大三相线路的放线应力差异化,即增大系统的频率错配参数,振幅呈整体下降态势,但当放线应力差异化接近10%左右时,振幅已基本稳定,频率错配的减振效果趋于最优。全面考虑耦合强度、时间延迟和频率错配等影响因素对三相输电线动力系统进行最优设计,则该系统在各种危险工况下的减振率可达30%~90%。
The vibration reduction of dynamic system of three-phase coupled overhead transmission line was studied.With the 220 kV transmission line project of Hunan Province as the engineering prototype,a test model of two-span three-phase transmission line with adjustable stiffness interphase spacers and time delay excitation device was designed according to the principle of dynamic similarity.The three-phase transmission lines are a nonlinear multi-vibrator coupled dynamic system,and the state of micro-amplitude vibration can be achieved by optimizing the structural parameters of coupling strength,frequency mismatch and time delay.The test results show that the vibration of transmission line system has three stages i.e.amplitude declining,micro-amplitude vibration and amplitude rise with the increase of parameters of coupling strength and time delay.The stable parameter interval of micro-amplitude vibration is convenient for the control of vibration of transmission line.The tension of three-phase transmission lines is adjusted asynchronously to realize frequency mismatch between vibrators.The larger the frequency mismatching parameter,the smaller the vibration amplitude of the system.When the tension differentiation between phases reaches 10%,the vibration amplitude of system tends to be stable and achieves the minimum value.Considering the factors such as coupling strength,frequency mismatch and time delay comprehensively,the vibration reduction rate of optimal system can be as high as 30%-90% under various dangerous conditions.
作者
谢献忠
吴源杰
王文军
梁开元
彭剑
XIE Xianzhong;WU Yuanjie;WANG Wenjun;LIANG Kaiyuan;PENG Jian(School of Civil Engineering,Hunan University of Science and Technology,411201 Xiangtan,China)
出处
《应用力学学报》
CAS
CSCD
北大核心
2022年第1期87-95,共9页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金项目(No.11272119)。
关键词
耦合减振
频率错配
时延耦合
耦合强度
输电线路
coupled vibration reduction
frequency mismatch
delay coupling
coupling strength
transmission line
