环境条件纵向变化对输电线路电压稳定裕度影响的研究

Mahbubur Rahman, Christoph Braun, V. Cecchi
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引用次数: 3

摘要

输电线路跨越的地理区域很广,经历了不同的环境条件。沿线路长度变化的天气条件会引起导线温度的变化,从而导致线路电气参数沿其长度的不均匀分布。这种电气参数的不均匀分布预计会影响线路功率处理能力。为了研究天气条件的纵向变化对线路电压稳定裕度的影响,在这项工作中使用了线模型分割方法。该方法考虑了线路参数的不均匀性,根据天气条件的变化程度,将线路模型划分为多个集总参数段。本文采用多段线路模型和简单加权平均法研究了电压稳定裕度对线路电压稳定裕度的影响,其中单段线路采用导线沿线温度加权平均计算参数。将模拟结果与静态线路评级方法进行了比较,静态线路评级方法使用一组预定义的天气条件进行线路建模。当考虑到环境条件的纵向变化时,发现线路电压稳定裕度存在明显差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study of the impact of longitudinal variations in ambient conditions on transmission line voltage stability margin
Electric power transmission lines span through wide geographical areas, experiencing different ambient conditions. Varying weather conditions along the length of the line introduce changing conductor temperatures and hence non-uniform distribution of line electrical parameters along its length. This non-uniform distribution of electrical parameters is expected to impact line power handling capabilities. In order to investigate the impact of longitudinal variations in weather conditions on line voltage stability margins, a line model segmentation approach is used in this work. This line modeling approach, which accounts for non-uniformities in line parameters, divides the line model into multiple lumped parameter segments based on the degree of change in weather conditions. The multi-segment line model and a simple weighted average approach, in which a single segment with parameters calculated at the weighted average conductor temperature along the line is employed, are used in this paper to study the impact on line voltage stability margin. Simulation results are compared with the static line rating approach, in which a set of predefined weather conditions is used for line modeling. Noticeable differences were found in line voltage stability margins when longitudinal changes in ambient conditions were taken into account.
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