The real-time preventive control is particularly critical because the integration of renewable energy aggravates the random fluctuation of large power grid operating state. An online preventive control optimization method for static voltage stability is proposed based on the Thevenin equivalent parameter identification. According to the definition of the stability margin, its quantitative relationship with the control variable is derived to meet the real-time and reliability requirements of online applications. The preventive control optimization model is constructed to minimize control cost and consider voltage stability margin and operation constraints under multiple critical contingencies. The generator terminal voltage and shunt capacitor in this paper are taken as continuous and discrete control variables respectively. The derived analytical relationship between stability margin and control variable is linearized to form linear security constraints, and the optimization model is transformed into a mixed-integer linear programming problem, which can be solved by CPLEX quickly and reliably. The accuracy and rapidity of the proposed method are verified on several test systems.

中文翻译：

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大电网静态电压稳定在线预防控制方法

由于可再生能源的并网加剧了大电网运行状态的随机波动，因此实时预防控制尤为关键。提出了一种基于戴维宁等效参数辨识的静态电压稳定在线预防控制优化方法。根据稳定裕度的定义，推导出其与控制变量的定量关系，满足在线应用的实时性和可靠性要求。构建预防控制优化模型以最小化控制成本，并考虑多种关键突发事件下的电压稳定裕度和运行约束。本文中发电机端电压和并联电容器分别作为连续和离散控制变量。将导出的稳定裕度与控制变量的解析关系线性化，形成线性安全约束，将优化模型转化为混合整数线性规划问题，CPLEX可以快速可靠地求解。在多个测试系统上验证了所提出方法的准确性和快速性。