电力系统暂态稳定性闭环控制(二)——多机电力系统暂态不稳定判别方法

Closed-loop control of power system transient stability(2):transient instability detection method of multi-machine power system

定义了具有一定预测功能的复合功角,据此将多机系统实时划分为2组同调机群并等值为一个单机系统。将基于轨迹凹凸性的不稳定指标从单机系统拓展到多机系统中,针对非自治特性发展出角度-角加速度平面暂态不稳定辅助判据,提出基于响应的多机系统不稳定实时判别方案。IEEE 10机39节点系统和三华实际电网的仿真结果表明,该方案可以根据系统发生多次大扰动后的响应准确地判断系统的暂态稳定性,为后续闭环紧急控制奠定了基础。

A composite power angle with a certain prediction function is defined,according to which,a muhi- machine power system is divided in real time into two coherent generator groups and then equalized to a single-machine power system. The instability criterion of the single-machine power system,which is based on the trajectory convexity and concavity,is extended to the multi-machine power system while an assistant instability criterion is developed on the angle-angular acceleration plane for the non-autonomous characteristics,and a real-time instability detection scheme based on the response is proposed. Simulative results of IEEE 10-generator 39-bus system and Sanhua actual power grid show that,the transient stability of power system can be correctly detected according to its responses to the multiple large disturbances occurred in it,which lays the foundation for subsequent closed-loop control.