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相量测量单元(PMU)量测和戴维南等值模型的结合,为电压稳定在线监视提供了新思路。文中利用电路原理的相关理论,对传统戴维南等值模型的不足进行了定性分析,并在此基础上提出了一种改进的戴维南等值模型。对改进模型的量测方程、可解性条件、求解方法和误差分析等方面进行了研究,以负荷裕度为电压稳定性指标,将改进模型用于电压稳定在线监视,并对数据窗的选取、改进模型的退化、应用环境等相关问题进行了分析。对IEEE 39节点系统进行了仿真,仿真结果表明改进模型比传统模型具有更好的精度和适用性。
The combination of phasor measurement unit (PMU) measurement and Thevenin equivalent model provides a new idea for on-line voltage stability monitoring. In this paper, the theory of circuit theory is used to qualitatively analyze the deficiency of the traditional Thevenin equivalent model. Based on this, an improved Thevenin equivalent model is proposed. The measurement equations, solvability conditions, solution methods and error analysis of the improved model are studied. The load margin is the voltage stability index, and the improved model is used for online monitoring of voltage stability. The selection of data window , To improve the degradation of the model, the application environment and other related issues were analyzed. The IEEE 39-bus system is simulated. The simulation results show that the improved model has better accuracy and applicability than the traditional model.