Impact of FACTS controllers on the stability of power systems connected with doubly fed induction generators

2011 ◽  
Vol 33 (5) ◽  
pp. 1172-1184 ◽  
Author(s):  
N. Senthil Kumar ◽  
J. Gokulakrishnan
Keyword(s):  
Power Systems ◽  
Induction Generators ◽  
Doubly Fed Induction Generators ◽  
Facts Controllers ◽  
Doubly Fed ◽  
The Stability

scholarly journals Grid-Synchronization Stability Analysis for Multi DFIGs Connected in Parallel to Weak AC Grids

Energies ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 4361 ◽  
Author(s):  
Dong Wang ◽  
Yunhui Huang ◽  
Min Liao ◽  
Guorong Zhu ◽  
Xiangtian Deng
Keyword(s):  
Short Circuit ◽  
State Space Model ◽  
Detailed Model ◽  
Reduced Order ◽  
Grid Synchronization ◽  
Induction Generators ◽  
Doubly Fed Induction Generators ◽  
Doubly Fed ◽  
The Stability ◽  
Stability Issues

Recent works have shown that phase-locked loop (PLL) synchronized wind turbines (WTs) suffer stability issues when integrated into weak grids. However, most of the current studies are limited to a single machine case, the interactions among the WTs are usually overlooked. This paper studies the stability of multiple doubly-fed induction generators (DFIGs) that are connected in parallel to a weak AC grid. A state space model of a two-DFIG system is firstly presented. Subsequently, eigenvalue sensitivity analysis shows that instability can occur at low short-circuit ratio (SCR) or heavy loading conditions. Meanwhile, participation factor analysis implies that the unstable mode is primarily induced by the interactions between the PLLs of the two WTs. Further, to make out how the PLLs interact to cause instability, a reduced-order model is proposed for analysis simplicity, and an explanation in terms of transfer function residue is given for illustration. Detailed model-based time domain simulations are conducted to validate the analyses’ results.

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