标题：Negative resistance effect induced by network dynamics in power-electronic-based power systems: A simple case study

作者：Qingfeng Yue ; Jiawei Yu ; Meng Zhan

摘要：In the traditional power systems, power flow studies focus on the stationary relationship of the active and reactive powers versus bus voltage under the quasi-steady state approximation. With increasing penetration of power electronics devices including renewable generations interfaced through converters, the system dynamical behaviour changes substantially. Due to the fast dynamics of converters, such as the AC current controller, the quasi-stationary state approximation may not be applicable. In order to catch the network characteristics accurately, we derive the explicit small-signal relation between instantaneous power and voltage vectors. Further, we study a simple power system model, which includes a network equation considering dynamics relationship and a swing equation. The numerical and analytical results demonstrate a novel negative resistance effect induced by generators on network dynamics. This effect may be weak for the traditional power systems, however, it may become significant for the new-generation power-electronic-based power systems.

发表于：8th Renewable Power Generation Conference (RPG 2019)