基于安全性约束和经济性分析的输电线路增容方法研究

针对输电线路增容运行过程的安全性和经济性问题,提出基于安全性约束和经济性分析的输电线路增容方法。该输电线路增容方法包括温度校核、故障率校核和经济性分析3个主要步骤。利用热平衡微分方程计算了输电线路实时温度,建立了基于比率故障率模型的输电线路短期可靠性模型,计算了输电线路故障率,基于输电线路抗拉强度损失的经验公式,提出了相对老化速率的计算方法。从输电收益、线路损耗成本和线路寿命损耗成本3个经济性指标,量化描述了输变电线路增容运行的经济收益。研究结果表明:所提出的输电线路增容方法可以对原始增容方案进行优化,能够实现输电线路增容运行安全性和经济性的平衡;最终得到的增容方案既满足输电线路温度约束和故障率约束,同时具有良好的经济性。

Transmission line rating method based on security constraint and economy analysis

Aiming at the security and economy problem of transmission line rating,a transmission line rating method based on security con-straint and economy analysis was proposed. This transmission line rating method consisted of three main steps:temperature verification, fail-ure rate verification and economy analysis. The real-time temperature of transmission line could be calculated by heat balance differential e-quation. A short-term reliability model of transmission line based on the PHM ( proportional hazard model) was presented in this paper. A computing method of relative aging rate of transmission line based on empirical formula of tensile strength loss was proposed. The economy of transmission line rating was described from three terms including transmission profit, transmission loss cost and life loss cost. The results in-dicate that the proposed transmission line rating method can achieve a balance between security and economy. The final rating plan obtaines by the method satisfies the constraints of temperature and failure rate, and it is economical in the meanwhile.