Model of stator inter-turn short circuit fault in doubly-fed induction generators for wind turbine

2004 ◽  
Author(s):  
Q.F. Lu ◽  
Z.T. Cao ◽  
E. Ritchie
Keyword(s):  
Wind Turbine ◽  
Short Circuit ◽  
Induction Generators ◽  
Doubly Fed Induction Generators ◽  
Doubly Fed ◽  
Short Circuit Fault

Variable-speed Wind Turbines with Doubly-fed Induction Generators Part II: Power System Stability

2002 ◽  
Vol 26 (3) ◽  
pp. 171-188 ◽  
Author(s):  
Vladislav Akhmatov
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Short Circuit ◽  
Power Grid ◽  
System Stability ◽  
Variable Speed ◽  
Electrical Currents ◽  
Induction Generators ◽  
Doubly Fed Induction Generators ◽  
Doubly Fed

This article describes the second part of a larger investigation of dynamic interaction between variable-speed wind turbines equipped with doubly-fed induction generators (DFIG) and the power grid. A simulation model is applied for dynamic stability investigations, with the entire power grid subjected to a short-circuit fault. During the grid disturbances, the DFIG converter is found to be the most sensitive part of the wind turbine. Therefore the electrical currents are determined using the transient generator model. The converter action is crucial for wind turbine operation associated with such disturbances, especially regarding tripping or uninterrupted operation.

Variable-Speed Wind Turbines with Doubly-Fed Induction Generators Part III: Model with the Back-to-back Converters

2003 ◽  
Vol 27 (2) ◽  
pp. 79-91 ◽  
Author(s):  
Vladislav Akhmatov
Keyword(s):  
Wind Turbines ◽  
Short Circuit ◽  
Practical Investigations ◽  
System Stability ◽  
Variable Speed ◽  
Induction Generators ◽  
Doubly Fed Induction Generators ◽  
Set Up ◽  
Doubly Fed ◽  
Short Circuit Fault

A model of the back-to-back converter is set up and implemented in the simulation tool PSS/E as a user-developed model. This model is applied with that of the doubly-fed induction generator (DFIG), described in previous parts of this work [parts II and I]. The latter models variable-speed wind turbines in power stability investigations. Subjected to a short circuit fault, there will be a risk of converter blocking, followed by tripping of the wind turbine [1, 3]. The main reasons of blocking are over-current in the rotor converter and over-voltage in the dc-link. The DFIG model, with representation of the back-to-back converter, results in (a) more accurate replication of the current in the rotor converter and (b) improved computation of the dc-link voltage. These improvements are compared with the model with representation of the rotor converter only. Hence, the DFIG model with representation of the back-to-back converters might be preferred, in practical investigations of power system stability, to models with representation of the rotor converter only.

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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