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The use of active magnetic bearings (AMB) is increasing in high-speed applications, because their low friction operation allows higher rotational speeds than the traditional bearings. The inherent instability and complexity of the AMB rotor system with high nonlinearities pose challenges to the controller design. This leads to a problem of robust design. Robustness of LQG and loop-shaping H∞ controllers...
This paper investigates a robust model predictive control approach for a nonlinear aerodynamic test rig, a twin rotor multi-input-multi-output system (TRMS). A highly nonlinear dynamic model of the system has been used to design the robust controller. According to the nonlinear model a polytopic model has been developed considering the nonlinearities and uncertainties of the plant. To this end, a...
This paper discusses the nonlinear control problem for variable-speed wind energy conversion system. Due to the stochastic operating conditions and the inevitable uncertainties inherent in the system, linear control method comes at the price of poor system performance and low reliability. So, it first develops a detailed model of variable-speed wind energy conversion system, which incorporated a distributed...
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