Comparative analysis of stability limitations in weak grid-connected synchronous generator, VSC, and DFIG systems considering the power flow control dynamics

被引:7
作者
Wang, Dong [1 ,2 ]
Hou, Yunhe [1 ,2 ]
Hu, Jiabing [3 ]
机构
[1] Univ Hong Kong, Dept Elect & Elect Engn, Hong Kong, Peoples R China
[2] Univ Hong Kong, Shenzhen Inst Res & Innovat, Shenzhen, Peoples R China
[3] Huazhong Univ Sci & Technol, State Key Lab Adv Electromagnet Engn & Technol, Wuhan 430074, Hubei, Peoples R China
基金
美国国家科学基金会;
关键词
power generation faults; load flow control; invertors; power control; power generation control; asynchronous generators; power grids; voltage-source convertors; reduced order systems; weak grid conditions; voltage source converter-based high-voltage DC; partial VSC; induction generator systems; instabilities; possible unified explanation; instability issues; DFIG systems; outer power flow controls; reduced-order models; active power control loops; grid strength decrease; right-half-plane zeros; stability boundary; comparative analysis; stability limitations; weak grid-connected synchronous generator; power flow control dynamics; conventional power systems; synchronous generators; stability issues; SG instability mechanism; identified RHPZ limitations; RHPZ; SMALL-SIGNAL STABILITY;
D O I
10.1049/iet-rpg.2018.5001
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In the conventional power systems, the synchronous generators (SGs) are known to suffer stability issues under weak grid conditions. Recently, similar problems are observed in the inverter interfaced systems, including the full voltage source converter (VSC)-based high-voltage DC, and partial VSC interfaced doubly fed induction generator (DFIG) systems, but the root causes of these instabilities in reality are not completely understood yet. This study aims to provide a possible unified explanation for the origin of these instability issues. With the experiences of SG's instability mechanism, for the VSC and DFIG systems, the dynamics of outer power flow controls are mainly focused, and the reduced-order models are parallelly presented first. Then, centralised around the active power control loops of these systems for analysis, it is found that an open-loop zero will move to the right half plane with grid strength decrease. The borders for the occurrence of right-half-plane zeros (RHPZs) are analytically derived. Further, a general interpretation regarding these identified RHPZs' limitations, including the adverse phase lag effect on stability and the attraction effect on the stability boundary, is illustrated. In addition, a uniform explanation for the origin of the RHPZs in these systems is also provided. Time-domain simulations are conducted to validate the analysis.
引用
收藏
页码:94 / 102
页数:9
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