Sub-synchronous Oscillation in DFIG System Connected to Weak Grid

被引：0
|
作者：
Zhu T. [1 ]
Sun H. [1 ]
Qin S. [2 ]
Han Y. [1 ]
Huang B. [1 ]
Mao Y. [1 ]
Wang D. [1 ]
机构：
[1] State Key Lab of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan
[2] State Key Lab of Operation and Control of Renewable Energy, China Electric Power Research Institute, Haidian District, Beijing
来源：
Dianwang Jishu/Power System Technology | 2021年 / 45卷 / 05期
关键词：
DFIG; Frequency support control; Phase-locked loop (PLL); Subsynchronous oscillation (SSO); Weak grid;
D O I：
10.13335/j.1000-3673.pst.2020.2031
中图分类号：
学科分类号：
摘要：
The reduced power grid strength caused by a long distance electrical transmission threatens the stability of the wind power grid-connected system. Currently, the weak AC network requires the wind turbine to have frequency response capability. Based on the state space analysis method, this paper studies the subsynchronous oscillation (SSO) problem of the DFIG-based grid-connected system considering phase-locked loop (PLL) and frequency support control under a weak grid. First, the model of the system was established. Then, it is found that the SSO dominated by PLL may occur in the DFIG-based grid-connected system under the weak grid through eigenvalue analysis. Finally, the influence of PLL parameters and frequency support control on SSO is studied, and the correctness of the eigenvalue analysis results is verified by electromagnetic transient simulation. © 2021, Power System Technology Press. All right reserved.
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页码：1641 / 1647
页数：6
相关论文
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