The steady-state security region of the integrated energy system (IES) is a useful tool for rapid security assessment and security evaluation of the integrated energy system. A complete characterization of the IES steady-state security region is derived. The derivation is under the nonlinear and non-convex AC power flow model, the gas flow model, and the uncertainty of renewable energy without any linear simplification. Then a novel and robust computation scheme to compute the IES steady-state security region is proposed and shown to eliminate the estimation errors of the existing methods. It is shown that the IES steady-state security region is non-convex and composed of several disjoint components. Numerical studies are conducted to show that the IES steady-state security regions obtained from the existing methods can be inaccurate, while the proposed characterization gives an exact estimation of the IES steady-state security region that significantly improves the previously proposed methods.

中文翻译：

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电-气综合能源系统稳态安全域的完整表征


综合能源系统（IES）稳态安全域是综合能源系统快速安全评估和安全评估的有用工具。导出了 IES 稳态安全区域的完整特征。推导是在非线性非凸交流潮流模型、燃气流模型以及可再生能源的不确定性下进行的，没有任何线性简化。然后提出并展示了一种新颖且鲁棒的计算方案来计算 IES 稳态安全区域，以消除现有方法的估计误差。结果表明，IES 稳态安全区域是非凸的，并且由多个不相交的组件组成。数值研究表明，从现有方法获得的 IES 稳态安全区域可能不准确，而所提出的表征给出了 IES 稳态安全区域的精确估计，从而显着改进了先前提出的方法。