Maximum Power Extraction from Wind Turbines Using a Fault-Tolerant Fractional-Order Nonsingular Terminal Sliding Mode Controller

This work presents a nonlinear control approach to maximise the power extraction of wind energy conversion systems (WECSs) operating below their rated wind speeds. Due to nonlinearities associated with the dynamics of WECSs, the stochastic nature of wind, and the inevitable presence of faults in pra...

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Bibliographic Details
Published in:Energies (Basel) 2021-09, Vol.14 (18), p.5887
Main Authors: Mousavi, Yashar, Bevan, Geraint, Küçükdemiral, Ibrahim Beklan, Fekih, Afef
Format: Article
Language:English
Subjects:
Actuators
Alternative energy sources
Calculus
Controllers
Convergence
Energy conversion
Fault diagnosis
Fault tolerance
fault tolerant control
Fractional calculus
fractional nonsingular terminal sliding mode control
Load
Mathematical models
Maximum power
maximum power extraction
Nonlinear control
Nonlinearity
Robust control
Rotor speed
Simulation analysis
Sliding mode control
Stability analysis
Stability criteria
Stochasticity
Turbines
Wind power
Wind speed
wind turbine
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Summary:This work presents a nonlinear control approach to maximise the power extraction of wind energy conversion systems (WECSs) operating below their rated wind speeds. Due to nonlinearities associated with the dynamics of WECSs, the stochastic nature of wind, and the inevitable presence of faults in practice, developing reliable fault-tolerant control strategies to guarantee maximum power production of WECSs has always been considered important. A fault-tolerant fractional-order nonsingular terminal sliding mode control (FNTSMC) strategy to maximize the captured power of wind turbines (WT) subjected to actuator faults is developed. A nonsingular terminal sliding surface is proposed to ensure fast finite-time convergence, whereas the incorporation of fractional calculus in the controller enhances the convergence speed of system states and simultaneously suppresses chattering, resulting in extracted power maximisation by precisely tracking the optimum rotor speed. Closed-loop stability is analysed and validated through the Lyapunov stability criterion. Comparative numerical simulation analysis is carried out on a two-mass WT, and superior power production performance of the proposed method over other methods is demonstrated, both in fault-free and faulty situations.
ISSN:1996-1073
1996-1073
DOI:10.3390/en14185887