The coupled single-port circuit has been proposed for online voltage stability assessment based on wide-area measurements and grid equations. This circuit can explicitly reflect the influence of grid and load on voltage stability. However, it does not consider the impact of power generation. A novel Thévenin equivalent (TE) circuit considering the influence of source-grid-load on voltage stability is proposed in this paper. First, the impact of source-grid-load on the voltage of an individual load bus is divided into three parts according to the node-voltage equation. They are then decomposed into two components, respectively associated with the TE voltage and the TE impedance according to the TE circuit’s characteristics. Finally, an online identification method for the parameters of the proposed TE circuit based on wide-area measurements is developed. Compared with the coupled single-port circuit, the proposed method has the advantage of being able to consider the influence of power generation on voltage stability and being consistent in form with traditional TE circuit without requiring approximation. Case studies on the IEEE 118-bus system illustrate the accuracy and effectiveness of the proposed method.

中文翻译：

---

考虑电力系统源-电网-负载相关性的新型特维宁等效模型

已提出了基于广域测量和电网方程式的耦合单端口电路，用于在线电压稳定性评估。该电路可以明确反映电网和负载对电压稳定性的影响。但是，它没有考虑发电的影响。提出了一种考虑源电网负载对电压稳定性影响的新型蒂文宁等效电路。首先，根据节点电压方程，将源极电网负载对单个负载母线电压的影响分为三部分。然后根据TE电路的特性将它们分解为两个分量，分别与TE电压和TE阻抗相关。最后，提出了一种基于广域测量的TE电路参数在线识别方法。与耦合单端口电路相比，该方法的优点是能够考虑到发电对电压稳定性的影响，并且在形式上与传统的TE电路一致，而无需近似。IEEE 118总线系统的案例研究说明了该方法的准确性和有效性。