摘要
随着能源短缺问题日益严峻、供电可靠性要求不断提高,大幅度提高输电线路输送能力,降低输电成本势在必行,而热稳定约束是限制架空导线载荷能力的一个重要因素。在分析基于热平衡方程计算架空导线载流量的基础上,考虑蒸发散热对导线热稳定的影响,并对日照吸热的计算进行了优化,减少了载流量计算的误差。同时,利用交直流电阻比与电流的非线性关系简化了计算,使得载流量的计算简单易行。通过对三节点简单电力系统进行分析,讨论了传统载流量标准可能导致的问题,提出综合考虑热稳定约束与潮流变化,得到导线温升过程的曲线,由此判别架空导线的短期载荷能力。基于上述模型,开发了智能电网在线监测系统中动态增容监测模块,以提高电力系统运行的安全性和经济性。
With the increasingly serious energy shortages and the increasing demand for reliability of power supplying, it is imperative that the transmission capacity of transmission lines should be substantially improved to reduce transmission costs. Thermal stability constraint is a key factor of the restriction of carrying capacity of overhead transmission lines. On the basis of calculation of carrying capacity of overhead transmission line according to thermal balance equations, the effect of evaporative cooling on the thermal stability of transmission lineg is analyzed. The calculation of heat absorption under solar radiation is optimized in order to reduce calculation errors. The non-linear relationship between the rate of AC-DC resistance and current is used to simplify the calculation of carrying capacity. Through the analysis of a three-point power system, the potential problems of traditional standard of current carrying capacity are discussed. By considering thermal stability constraint and the change of power flow, the track of temperature rising process of the conductor is presented, consequently the short-term carrying capacity of overhead transmission line can be differentiated. Based on the above principle, dynamic rating monitoring module in smart grid online monitoring system is developed to improve the security and economy of the system.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第14期86-91,共6页
Power System Protection and Control
关键词
电力系统
架空导线
载流量
热稳定
导线温度
ectric power system
overhead transmission line
current carrying capacity
thermal stability
conductor temperature
