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随着我国交直流混合系统规模的不断扩大,交直流混合系统可用输电能力(available transfer capability,ATC)的计算模型和方法的研究成为一个关键问题。电力系统是一个动态时变系统,存在大量的不确定性和随机性,考虑这些不确定性因素对ATC的影响是准确计算ATC的一个难点。文中提出了一种基于非序贯蒙特卡罗仿真的可用输电能力评估方法,综合考虑负荷变化、设备故障、直流系统控制方式变化和天气等不确定性因素的影响,并从充裕性方面定义一系列的概率指标进行ATC评估。采用Matlab7.1编写相关的计算程序,并用改进的IEEE 14节点系统进行算例分析。计算结果表明,文中所提方法正确有效,能给出更准确的ATC信息。
With the continuous expansion of the scale of AC / DC hybrid system in our country, the research on available transfer capability (ATC) models and methods for AC / DC hybrid systems becomes a key issue. The power system is a dynamic time-varying system, which has a lot of uncertainty and randomness. Considering the influence of these uncertainties on the ATC is a difficult point to accurately calculate the ATC. In this paper, a method based on non-sequential Monte Carlo simulation of available transmission capacity assessment, considering load changes, equipment failure, DC system control changes and weather and other uncertain factors, and from the definition of a Series of probability indicators for ATC assessment. Matlab7.1 is used to write the relevant calculation program, and an improved IEEE 14-node system is used to carry out the example analysis. The calculation results show that the proposed method is correct and effective and can give more accurate ATC information.