期刊
JOURNAL OF CONTROL AUTOMATION AND ELECTRICAL SYSTEMS
卷 32, 期 4, 页码 942-955出版社
SPRINGER
DOI: 10.1007/s40313-021-00707-y
关键词
Sliding mode; Fixed-time; Chaotic; Observer; Adaptive; Synchronization
资金
- Ministry of Higher Education, Malaysia [LRGS/1/2019/UKM-UM/01/6/3]
The paper proposes a novel fixed-time adaptive sliding mode control scheme using a state observer for synchronizing chaotic support structures for offshore wind turbines in the presence of matched parametric uncertainties. The proposed controller integrates adaptive control concept, SMC method, fixed-time stability concept, and a state observer. The simulation results demonstrate that the proposed controller ensures fixed-time synchronization and provides accurate estimation of the unmeasured state and uncertainty upper bound.
The chaotic support structures for offshore wind turbines are often subjected to a severe environment. A robust control scheme needs to be considered to maintain them in a safe operational limit. Robust sliding mode control (SMC) scheme can provide an excellent robust controller against this severe and challenging environment for these chaotic structures. This paper proposes a novel fixed-time adaptive sliding mode control scheme with a state observer to synchronize chaotic support structures for offshore wind turbines in the presence of matched parametric uncertainties. The proposed controller is a new integration of adaptive control concept, SMC method, fixed-time stability concept and a state observer. A fixed-time stability concept is used to provide stability for the system within a presented time regardless of initial conditions. The adaptive concept is utilized to provide an online estimator of the uncertain upper bound. Also, a nonlinear observer is employed to provide an online estimator of an unmeasured state in the controller. Lyapunov stability theorem is used to analyze fixed-time stability of the system based on SMC methodology. The simulation results demonstrate that the proposed controller is able to ensure fixed-time synchronization along with providing precise means to estimate the unmeasured state as well as uncertainty upper bound.
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