Critical SCR for the stability of VSC connected to weak grid

被引：0
|
作者：
Fu, Ruiqing [1 ]
Li, Longyuan [1 ]
Wang, Xiaoru [1 ]
Lv, Xiaoqin [1 ]
机构：
[1] Southwest Jiaotong Univ, Sch Elect Engn, Chengdu, Peoples R China
来源：
2020 IEEE POWER & ENERGY SOCIETY GENERAL MEETING (PESGM) | 2020年
关键词：
Grid-connected VSC; weak grid; critical short-circuit ratio (CSCR); maximum power transfer; VSC-grid interaction in sequence domain;
D O I：
暂无
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
Voltage source converter (VSC) has been widely employed in power system. However, when a VSC is connected to weak grid, its stability is challenged. In this paper, a VSC-grid interaction model in sequence domain is proposed. The critical short-circuit ratio (CSCR) for the stability of grid-connected VSC is derived. Furthermore, based on CSCR, the transmission capacity limitation of grid- connected VSC is estimated and quantified. It is found that the CSCR and the maximum power transfer of grid-connected VSC are determined as a function of phase-locked loop (PLL) bandwidth. The theoretical findings are verified by the Generalized Nyquist Stability Criterion (GNC) and time-domain simulation.
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页数：5
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