Analysis of Small Signal Stability of Grid-Connected Doubly Fed Induction Generators

Li, Shan-Ying; Sun, Yu; Wu, Tao; Qun-ju, LI; Liu, Hui

doi:10.1109/appeec.2010.5448420

Cited by 7 publications

(5 citation statements)

References 9 publications

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“…Then the flux is selected as a state variable, and the fifth-order dynamic model in [19] is used to describe the induction generator. The equation of motion has been included in (1) and reflected in the third mass. Thus, the small-signal model for the induction generator is given by…”

Section: Dfig Modelmentioning

confidence: 99%

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Torsional vibration characteristics analysis of DFIG‐based wind farm and its equivalent model

Xie

Sun

Yi-chen

et al. 2017

IEEJ Transactions Elec Engng

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As large‐scale wind farms (WFs) are integrated with the power grid, the interaction between the WF and the grid may excite torsional vibration of the shaft of the wind turbine. To study the shaft's torsional vibration characteristics of a doubly fed induction generator (DFIG)‐based WF, a detailed small‐signal model of DFIG is established first. Then the small‐signal model for a WF composed of multiple DFIGs is developed on the basis of the single‐machine model. Modal analysis is employed to investigate the torsional vibration characteristics of a WF made up of several identical DFIGs, whose accuracy is also demonstrated through time‐domain simulation. To simplify the torsional vibration analysis for the DFIG‐based WF, a reduced‐order equivalent model is proposed. The results obtained from modal analysis show that the equivalent model not only precisely maintains all the torsional vibration modes of the original small‐signal model but also greatly reduces the computation complexity. With the equivalent model, the ‘curse of dimensionality’ problem is solved in torsional vibration analysis for large WFs, which is of great help in the design of further damping schemes. © 2017 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Section: Dfig Modelmentioning

confidence: 99%

“…As a green and renewable energy resource, wind energy has been developed quickly in recent years, which has led to the explosive growth of wind turbine generators (WTGs) connected to the power grid . However, there also exist obvious disadvantages of wind energy, such as the intermittency of wind.…”

Section: Introductionmentioning

confidence: 99%

Torsional vibration characteristics analysis of DFIG‐based wind farm and its equivalent model

Xie

Sun

Yi-chen

et al. 2017

IEEJ Transactions Elec Engng

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show abstract

“…In [8, 9], a reduced‐order DFIG model in DC‐link voltage control timescale is compared with the detailed model in terms of eigenvalues. Similarly, the oscillation modes of a more detailed model are presented in [10]. However, in previous studies, the effect of multi‐timescale control and its interactions on system stability is usually overlooked.…”

Section: Introductionmentioning

confidence: 99%

Modal analysis of a grid‐connected DFIG‐based WT considering multi‐timescale control interactions

Wan

2017

J. eng.

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“…Crucial dynamics of the DFIG-based WF for accurate SSS studies may be neglected. In [10][11][12], it is suggested to neglect the stator flux transient, the converter switching dynamic and the DC-link voltage regulation dynamic. In [13,14], the model is further simplified by neglecting the DFIG rotor transient additionally.…”

Section: Introductionmentioning

confidence: 99%

Enhanced model of the doubly fed induction generator‐based wind farm for small‐signal stability studies of weak power system

Geng

Yang

2014

IET Renewable Power Generation

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This study proposes an enhanced model of the doubly fed induction generator (DFIG)-based wind farm (WF) for small-signal stability (SSS) studies of weak power system. This model consists of a wind turbine, a drive train, a simplified generator/converter module and associated controls. As analysed and verified in this study, the dynamics of the phase-lockedloop and the rotor current loop are important for accurate SSS studies of the weak power system involving the DFIG-based WF and thus should be modelled appropriately. The enhanced model is validated by eigenvalue analysis and time-domain simulations. Compared with the detailed model, the WT3 model provided by General electric (GE) energy and the conventional model, the enhanced model presents high precision and satisfactory simplification for SSS studies. As the application of the enhanced model, a case study is carried out to explore the impact of WF ancillary voltage/frequency controls on SSS of the weak grid. As indicated in this study, the WF ancillary controls exert distinct impact on SSS. New lightly damped power oscillations can be introduced. Therefore extra measures should be considered if the ancillary controls are required by the WF in order to satisfy the future grid codes.

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Analysis of Small Signal Stability of Grid-Connected Doubly Fed Induction Generators

Cited by 7 publications

References 9 publications

Torsional vibration characteristics analysis of DFIG‐based wind farm and its equivalent model

Torsional vibration characteristics analysis of DFIG‐based wind farm and its equivalent model

Modal analysis of a grid‐connected DFIG‐based WT considering multi‐timescale control interactions

Enhanced model of the doubly fed induction generator‐based wind farm for small‐signal stability studies of weak power system

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