标题：Dynamic Modeling of Asymmetrical-Faulted Grid by Decomposing Coupled Sequences via Complex Vector

作者：Bo Wang ; Sicheng Wang ; Jiabing Hu

摘要：To study the electromagnetic dynamics of grid-connected voltage source converter (VSC) based devices during asymmetrical grid fault ride-through, this paper presents a generic dynamic modeling method for asymmetrical-faulted power grids. In the generic case, the asymmetrical impedances and the grounding inside a faulted grid introduce complicated couplings among the harmonics-contained sequence components. By employing complex vectors, the dynamics of each sequence, especially that of zero-sequence, can be depicted clearly and the complicated couplings can be decomposed. With dynamic composite sequence networks figured out, the characteristics of asymmetrical-faulted grids can be studied further. The presented modeling approach is validated by simulation, and its effectiveness is demonstrated by a case study of small-signal stability analysis for an exemplified grid-connected VSC injecting positive and negative sequence reactive currents to the faulted grid.

发表于：IEEE Journal of Emerging and Selected Topics in Power Electronics ( Early Access )