Adaptive synchronization with disturbance rejection for under-actuated ships with disturbances under thruster saturation

Abstract The performance of actively controlled magnetic bearings is greatly degraded if subjected to unpredictable disturbances or system dynamic variations. This paper present an adaptive synchronization control on a magnetically suspended rotor system for disturbance rejection and plant variation compensation. The rotor system consists of a rotating disk mounted on a shaft which is actively positioned in the radial directions via two magnetic bearings at both ends. Under the synchronizing control, four displacements of shaft along bearing axes are coordinated such that the disturbed displacement can promptly be recovered with those undisturbed in a complementary way. Such motion synchronization requires strict regulation and adaptation through four local controllers with an adaptive feedforward control scheme. The local controllers can be linked by the coupling law, in which an error along one bearing axis can affect overall control loop of four axes. Two control algorithms are developed under the biaxial and quadaxial synchronization conditions, and their adaptation laws are optimized in an attempt to minimize the adaptation errors. Simulations of disturbance rejection responses will also be presented.

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Adaptive Synchronization Control of Uncertain Load Power Systems

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.433-435.1282 ◽

2013 ◽

Vol 433-435 ◽

pp. 1282-1287

Author(s):

Di Liu ◽

Guo Peng Zhou ◽

Zhong You Wang ◽

Hong Yang Sun

Keyword(s):

Power Systems ◽

Disturbance Rejection ◽

Output Feedback Control ◽

Original System ◽

Output Regulation ◽

Control Technique ◽

Adaptive Synchronization ◽

Stabilization Problem ◽

Interconnected Power System ◽

Synchronous Control

This paper studies the synchronous control and disturbance rejection problem for a simple interconnected power system subjecting to a periodic disturbance with uncertain amplitude and frequency. By constructing a new exosystem, the synchronous control and disturbance rejection problem can be solved with output regulation theory. Designing an internal model for the complicated system and introducing an appropriate transformation, the output regulation problem is changed into the stabilization problem of a new augmented system. With the help of adaptive output feedback control technique, the designed dynamic energy storage controller can solve stabilization problem of the augmented systems as well as the synchronous control and disturbance rejection problem for the original system. Finally, the simulation results show the effectiveness of the proposed control strategy.

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