一种基于风速等效测量的架空线路动态增容模型

A Dynamic Capacity Increasing Model of Overhead Conductors Based on Equivalent Measurement of Wind Speed

现有的架空线路动态载流量计算模型对于风速的测量准确性提出较高要求,而现有测量技术很难满足此要求,因此,提出一种对风速进行等效测量的架空线路动态增容模型,也称为等效换热测量模型,在模型的实施过程中无需对风速进行测量。所提模型通过建立发热铝球和导线热损耗功率的关联性,实现对导线实时载流量的计算。利用有限元法仿真分析,讨论铝球的温度分布状态以及测温位置对模型计算结果的影响,并对所提模型进行验证。研究结果表明,当采用铝球表面稳态温度的最大值时,模型计算结果的相对误差不超过7%,满足工程应用的需求。因此,所提等效换热测量模型可克服风速测量相关的技术限制,提高架空线路输送电能的利用率。

Current dynamic thermal rating models make higher requirements for measurement accuracy of the wind speed,but the existing techniques can not meet the demands.have shortcomings in the measurement techniques of wind speed.Thus,this paper proposes a dynamic thermal rating model for equivalent measurement of wind speed,also calls an equivalent heat transfer measurement model,which is dispense with the need to measure the wind speed during the implementation of the model.By establishing the correlation of heat losses between the heating aluminum ball and the conductor,this model can perform the the calculation of real-time ampacity of the conductor.The paper also uses the finite element method for simulating analysis and discussion on temperature distributions of the aluminum ball as well as the effect of measurement position on the calculation results,so as to verify the effectiveness of the model.The research results show that when adopting the maximum steady-state temperature of the aluminum ball surface,the relative error of the calculation results does not exceed 7%,which meets the demands of engineering applications.Therefore,the equivalent heat transfer model proposed can avoid the limitation of the existing measurement techniques related to wind speed and improve the utilization rate of the overhead conductor.