基于灵敏度分析的综合能源系统运行安全性的研究

基于电-气互联综合能源系统子系统间的灵敏度矩阵，探究了电-气能源子系统间的交互耦合机理，提出一种提升综合能源系统运行安全性的改善措施。首先构建电-气耦合的综合能源系统模型，采用基于扩展牛顿-拉夫逊法的交替求解法求解该综合能源系统的多能流方程；在此基础上，借助综合能源系统灵敏度分析方法计算电压幅值-燃气负荷灵敏度矩阵和天然气系统节点压力-电力系统节点有功灵敏度矩阵，定量描述电、气系统间交互耦合作用机理；然后，通过灵敏度矩阵辨识与薄弱节点密切相关的关键环节，研究提升综合能源系统运行安全性的相关措施。最后，通过IEEE 24节点和比利时20节点天然气系统耦合的IEGES-24系统算例对所提方法进行分析、验证，结果表明所提方法可应用于综合能源系统交互耦合机理揭示和运行安全性分析。

Security analysis based on sensitivity analysis for integrated electric and gas energy system

The interaction coupling mechanism among the subsystems in IEGES(Integrated Electric and Gas Energy System) is explored based on the sensitivity matrices between the electric power system and natural gas system in IEGES, and the measure to enhance the operational security of IEGES is proposed. Firstly, the IEGES model is established, and then alternating solution method based on extended Newton-Raphson method is adopted to solve the multi-energy flow equation of the IEGES. According to the solved multi-energy flow of the IEGES, the sensitivity analysis approach is adopted to calculate the voltage amplitude-gas load sensitivity matrix and the natural gas system node pressure-power system node active power sensitivity matrix to quantitatively describe the interaction coupling mechanism between the electricity and gas systems in IEGES. Further, the weak nodes of IEGES are identified by the sensitivity matrices, and the measure to enhance the operational security of IEGES is proposed. The performance of the proposed approach is evaluated by the IEGES-24 test system integrating IEEE 24-bus system and Belgian 20-node gas system. The results demonstrate that the proposed approach can be used to reveal the interaction coupling mechanism of IES(Integrated Energy System) and analyze the operational security.