Robust Output Feedback Control Design for Inertia Emulation by Wind Turbine Generators

Wind generation has gained widespread use as a renewable energy source. Most wind turbines and other renewables connected to the grid through converters result in a reduction in the natural inertial response to grid frequency changes. The doubly-fed induction generator (DFIG) can be controlled to co...

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Bibliographic Details
Published in:IEEE transactions on power systems 2021-11, Vol.36 (6), p.5056-5067
Main Authors: Morovati, Samaneh, Zhang, Yichen, Djouadi, Seddik M., Tomsovic, Kevin, Wintenberg, Andrew, Olama, Mohammed
Format: Article
Language:English
Subjects:
Balanced truncation model reduction
Control theory
Converters
diesel-wind system
Doubly fed induction generators
Emulation
Feedback control
Frequency response
generators
Induction generators
Inertia
inertia emulation
Linear quadratic regulator
Modal analysis
Model reduction
Output feedback
output feedback control
Reduced order models
Reduced order systems
Robust control
Robustness
rotors
Short circuits
Synchronous machines
Turbogenerators
WIND ENERGY
Wind turbines
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Summary:Wind generation has gained widespread use as a renewable energy source. Most wind turbines and other renewables connected to the grid through converters result in a reduction in the natural inertial response to grid frequency changes. The doubly-fed induction generator (DFIG) can be controlled to compensate for this reduction and, in fact, provide faster response than traditional synchronous machines. This paper proposes to design observer based output feedback linear quadratic regulator (LQR) and H_{\infty } control laws to realize the inertia emulation function and deliver fast frequency support. The aim is to track the reference speed by a diesel synchronous generator (DSG) in order to reach the desired inertia. The control signal is computed based on a reduced order model using the balanced truncation technique. A comparison with selective modal analysis (SMA) and balanced truncation model reduction techniques is presented. Comprehensive results show the effective emulation of synthetic inertia by implementing the control laws on a nonlinear three-phase diesel-wind system. The proposed technique is analyzed for different short circuit ratio (SCR) scenarios.
ISSN:0885-8950
1558-0679
DOI:10.1109/TPWRS.2021.3070276