基于导线温度模型的线路动态容量误差分析

简要介绍了用于输电线路容量计算的导线温度模型的原理,该模型引入热传递系数,避免了气候模型中因快速变化而引起的测量误差,适用于导线温度高和风速小的情况;给出了模型的误差来源,包括估算日照热增益和辐射散热、模型中热传递系数的近似取值以及导线温度和电流的测量;详细分析了热传递系数的近似取值带来的影响,结果表明此影响甚微,可忽略;简单讨论了减小容量计算误差的方法.

Line dynamic capacity error analysis based on conductor temperature models

The working principle of the conductor temperature model used for line capacity calculation is presented.The model adopts the heat transfer coefficient to avoid errors caused by inaccurate measurement due to quickly fluctuating wind in the weather model,and is thus suitable for situations with high conductor temperature and low wind speed.The error sources of the model include the estimation of radiated heat loss and heat increment from sunlight,the approximation of the heat transfer coefficient,and the measurement of the conductor temperature and current.The influence of the approximation of the heat transfer coefficient is analyzed in detail,showing that the influence is too little to neglect.Methods for reducing the capacity calculation error are also discussed.