随机风场下紧凑型线路非同期摇摆仿真分析

Simulation of Asynchronous Swaying for Compact Overhead Transmission Line Within Stochastic Wind Field

基于FLUENT软件分析了迎风相导线对背风相导线的风压屏蔽作用,获得了迎风相和背风相导线各子导线的风阻系数。利用ABAQUS建立了500 kV紧凑型线路的单档有限元模型,模拟了随机风场下导线的非同期摇摆过程,研究了紧凑型线路的非同期摇摆特性及相间最小距离。研究结果表明,水平布置的两相导线易在非同期摇摆时出现相间距离过小问题,且相间最小距离主要出现在导线弧垂最低点附近。根据研究结果提出了基于相间间隔棒的不同布置及相间-相地间隔棒混合布置的紧凑型线路非同期摇摆防治措施,并对提出的各方案进行了防治效果评估,给出了紧凑型线路风偏/非同期摇摆防治建议。

The wind pressure shielding effect of upstream windward conductor on downstream leeward conductor was analyzied by FLUENT.And the wind load coefficients acting on the conductors in each phase were obtained.The finite element model of 500 kV compact line was established in ABAQUS,the asynchronous swaying process of transmission line under random wind field was simulated and the asynchronous sway character and minimum interphase distance of compact transmission were studied at the same time.The results indicate that horizontal phase conductor is more likely to appear too small distance between phases when the asynchronous swing occurred.And the minimum spacing mainly appears near the lowest point of line sag.According to the analysis results of asynchronous swaying of transmission line,some preventive measures for the different arrangement of phase-to-phase spacer and combine phase-to-phase spacer and phase-to-groud spacer are put forward.Then,the suppression effect of each scheme on the asynchronous swing of transmission line is evaluated.Finally,the suggestion of ynchronous wing prevention for transmission line is given.