特高压输电线路次档距振荡机理及其防振研究

理论分析和实际运行已证明，若采用的设计方案不合理，在风荷载作用下，输电线路分裂导线会发生次档距振荡，对输电运行造成严重危害，甚至会危及人民财产安全。本项目拟以特高压±800kV直流输电线路为研究对象，开展分裂导线次档距振荡机理及其防振理论、方法等共性和关键科技难题的研究。具体内容包括：基于风洞试验和计算流体力学数值研究，获得复杂风荷载作用下，不同分裂间距的输电线路导线的扰流气动特性；结合解析方法和非线性有限元数值仿真，研究流场-导线结构耦合作用下，外部环境、线路结构和间隔棒安装位置等多个参数对输电线路导线动态行为特征的影响，揭示分裂导线次档距振荡机理；提出有效的分裂导线次档距振荡防治手段；最终取得输电线路多分裂导线次档距振荡分析理论和防振方法。本项目旨在对特高压输电线路次档距振荡现象进行系统深入的研究，具有重要的理论价值、现实意义和广阔的工程应用前景。

According to theoretical analysis and operation experience of transmission lines, sub-span oscillation of bundle conductors may occur under the action of wind load, causing serious damage to the power transmission system and even endanger the public property and safety of people if the design is not properly carried out. This project intends to use UHV ±800kV DC transmission lines as the research object, focusing on analyzing mechanism of sub-span oscillation of bundle conductors and developing anti-vibration theory and methodology for solving common and key problems widely found in practice. The proposed tasks include: Correlating aerodynamic interference characteristics of transmission line with different bundle space under complex wind loading conditions based on the wind tunnel test and numerical simulation of fluid mechanics; investigating the effects of the environmental parameters, the conductor structure and the spacer installation position on dynamic behavior of the transmission lines; Revealing the mechanism of sub-span oscillation of bundle conductors through coupling the air flow and solid structure and combining analytical method and nonlinear finite element numerical simulations; Putting forward the effective anti-vibration schemes，finally developing the theory on characteristics of sub-span oscillation and providing design guidelines. The research aims at exploring and developing theories and practical methods for minimization of the sub-span oscillation of UHV transmission lines, which may have permanent theoretical value, practical significance and potential for broad application in engineering practice.