NDLI: Extending the Life of Gear Box in Wind Generators by Smoothing Transient Torque With STATCOM

Content Provider	IEEE Xplore Digital Library
Author	Molinas, M. Suul, J.A. Undeland, T.
Copyright Year	1982
Abstract	Gearboxes for wind turbines must ensure high reliability over a period of 20 years, withstanding cumulative and transient loads. One main challenge to this is represented by electromagnetic torque transients caused by grid faults and disturbances, which will result in significant stresses and fatigue of the gearbox. Possibilities for limiting the torque transients in fixed-speed wind generators have not been previously reported. This paper presents a technique by which the transient torques during recovery after a grid fault can be smoothed in a wind farm with induction generators directly connected to the grid. A model-based control technique using the quasi-stationary equivalent circuit of the system is suggested for controlling the torque with a static synchronous compensator (STATCOM). The basis of the approach consists of controlling the induction generator terminal voltage by the injection/absorption of reactive current using the STATCOM. By controlling the terminal voltage as a function of the generator speed during the recovery process, the electromagnetic torque of the generator is indirectly controlled, in order to reduce the drive train mechanical stresses caused by the characteristics of the induction machine when decelerating through the maximum torque region. The control concept is shown by time-domain simulations, where the smoothing effect of the proposed technique on a wind turbine is seen during the recovery after a three-phase-to-ground-fault condition. The influence of the shaft stiffness in a multimass drive train model is discussed, and the performance of the control concept in the case of parallel connection of several turbines is investigated to discuss the applicability in a wind farm.
Sponsorship	IEEE Industrial Electronics Society
Starting Page	476
Ending Page	484
Page Count	9
File Size	1435920
File Format	PDF
ISSN	02780046
Volume Number	57
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gears Smoothing methods Automatic voltage control Electromagnetic transients Induction generators Torque control Wind turbines Voltage control Circuit faults Stress wind energy Static synchronous compensator (STATCOM) voltage source converter
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering Computer Science Applications

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Torque transient alleviation in fixed speed wind generators by Indirect Torque Control with STATCOM

STATCOM-Based Indirect Torque Control of Induction Machines During Voltage Recovery After Grid Faults

Short circuit study of fixed speed wind turbines with STATCOM in distribution networks

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Determination of the STATCOM rating for the FRT of fixed speed wind turbines

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Extending the Life of Gear Box in Wind Generators by Smoothing Transient Torque With STATCOM

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