A novel control scheme for DFIG-based wind energy systems under unbalanced grid conditions

Fan, Lingling; Yin, Haiping; Miao, Zhixin

doi:10.1016/j.epsr.2010.08.011

Cited by 25 publications

(5 citation statements)

References 19 publications

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“…It's necessary to control the machine-side converter and grid-side converter to realize gridconnected. Compared with the control strategy of the above photovoltaic system, the control strategies of DFIG and PMSG wind turbine are more complex, but the general idea remains unchanged [10][11][12] .…”

Section: Grid Connection Strategy Of Distributed Generationmentioning

confidence: 99%

Study on safety operation of medium voltage distribution network

Chen

Lian

Wang³

et al. 2021

E3S Web Conf.

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Aiming at the problem of safe operation in the medium voltage distribution network with neutral point grounding through small resistance, the distribution network model was built, and on this basis, MW-level photovoltaic (PV) system, doubly fed Induction generator (DFIG) wind turbine, permanent magnet synchronous generator (PMSG) wind turbine and energy storage device was connected respectively in this paper. The ground current and earth potential rise was studied when the power was delivered by mistake. The simulation results show that in the system with neutral point grounding through small resistance, whether it is the traditional or the active distribution network, the three-phase power delivery method is more able to ensure the personal safety of power grid operators. However, The access to distributed generator (DG) in the distribution network will have a greater impact on ground current and earth potential rise in the case of three-phase power delivery. Especially when the ground current and earth potential rise will increase after DG connected to distribution network, which is still likely to pose a threat to personal safety and needs further research.

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Section: Grid Connection Strategy Of Distributed Generationmentioning

confidence: 99%

Study on safety operation of medium voltage distribution network

Chen

Lian

Wang³

et al. 2021

E3S Web Conf.

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“…By introducing the change rate of the stator flux as the feed‐forward compensation (FFC), the effect of the transient rotor current control is improved under the symmetrical voltage drops . However, application of the FFC to the asymmetrical LVRT of the DFIG has not been studied so far, which requires the dual‐sequence design based on the positive and negative sequence models …”

Section: Introductionmentioning

confidence: 99%

Asymmetrical LVRT of DFIG incorporating feed‐forward transient current control and controllable resistive‐type fault current limiter

Huang

2020

IEEJ Transactions Elec Engng

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During the low‐voltage ride‐through (LVRT) of the doubly fed induction generator (DFIG), the change rate of the stator flux is introduced as the feed‐forward compensation (FFC) to prevent the stator flux oscillation from affecting the rotor current control. The dual‐sequence FFC is proposed for the asymmetrical LVRT of the DFIG. To reduce the rotor voltage increase due to the FFC, the controllable resistive‐type fault current limiter (CRTFCL) is implemented at the stator side to improve damping to the stator flux oscillation. The resistance of the CRTFCL is controlled based on the ramp function to relieve oscillations resulted from the switch‐out of the CRTFCL. With the dual‐sequence FFC and CRTFCL applied to the asymmetrical LVRT, analytical expressions of the stator current, rotor current, and rotor voltage are derived. The accuracy of the analytical expressions and the improved LVRT performance with the dual‐sequence FFC and the CRTFCL are verified based on the time‐domain simulations. © 2020 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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“…One problem with the basic DTC scheme is that its performance deteriorates during start-up and for low speed operations. 7,8 Later, modified DTC approaches were developed. Other control methods include PI-based control, 9 non-linear and adaptive control, 10,11 yaw control, [12][13][14] pitch control, [15][16][17][18] and inverter firing angle control.…”

Section: Introductionmentioning

confidence: 99%

A bio-inspired approach to enhancing wind power conversion

Song

Cai

2012

Journal of Renewable and Sustainable Energy

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The primary objective of this investigation is to develop a new control method for wind turbines that can increase their wind energy capture efficiency. Since the resultant wind turbine system dynamics are profoundly nonlinear and coupled with significant uncertainties, traditional model-based control is found to be not only structurally complex but also computationally expensive. Here, we explore two sets of control algorithms to enhance wind to electrical energy conversion. The first accounts for system nonlinearities and external disturbances by integrating variable structure control with adaptive control. The second accommodates the nonlinearities arising from rotor aerodynamics and pitch (actuation) dynamics, as well as external disturbances, through a method inspired by a 1st order human memory/learning model. The second method allows direct maximum power coefficient tracking for winds under the rated speed and ensures rated power output for winds over the rated speed. Basically, it uses the system current and most recent memorized responses, together with past control experience, to generate new control actions. Both rotor dynamics and actuation (pitch) dynamics are reflected indirectly through the observed/measured system response at each instant, and are embedded within the control mechanism. Thus, there is no need for detailed information on the system model or system parameters in the control's design and implementation. The efficacy of both proposed approaches is analyzed through numerical simulations.

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A novel control scheme for DFIG-based wind energy systems under unbalanced grid conditions

Cited by 25 publications

References 19 publications

Study on safety operation of medium voltage distribution network

Study on safety operation of medium voltage distribution network

Asymmetrical LVRT of DFIG incorporating feed‐forward transient current control and controllable resistive‐type fault current limiter

A bio-inspired approach to enhancing wind power conversion

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