一种考虑线路短时过载的断面输电能力提高方法

A Transmission Capacity Improvement Method Considering Transmission Line Short-Time Overload

输电线路的热稳定极限是确定断面输电能力时必须考虑的一个重要因素,在传统安全分析中,线路热稳定极限是作为一个固定不变的值来考虑的,而实际运行中,热稳定是一个电热平衡过程,和环境因素密切相关。在此基础上,研究输电线路载流机理,建立输电线路的热力学模型,将此模型与潮流分析充分结合,形成电热协调的电力系统潮流求解模型和算法。在线路过负荷的测试环境下,校验线路的热稳定性,验证短时过负荷提高输电能力的正确性。

The limit of thermal stability is an essential part of determining the transmission capacity of the transfer section. In the traditional safety analysis, the limit is a constant value. However, in the actual power operation, it is a process of the electro-thermal coordination closely relating to the environmental factors. Based on the above statements, the paper does a study on the process of the line current-carrying and then creates a model of thermodynamics of the line. After that, we combine the model with power analysis tools, as a result, forming a calculation model of power analysis. Finally, we test the thermal stability of the line in the short-time overload environment and verify the increase on the transmission capacity in consequence.