Design and Implementation of a Robust Controller for a Free Gyro-Stabilized Mirror System

1999 ◽  
Vol 121 (3) ◽  
pp. 550-556
Author(s):  
Boon C. Siew ◽  
Ben M. Chen ◽  
Tong H. Lee
Keyword(s):  
Output Feedback ◽  
Cross Coupling ◽  
Mirror System ◽  
Eigenstructure Assignment ◽  
Robust Controller ◽  
Reduced Order ◽  
Overall Design ◽  
Output Feedback Controller ◽  
Design And Implementation ◽  
Asymptotic Time

In this paper, we consider the problem of designing a robust controller for a multivariable servomechanism of a free gyro-stabilized mirror system where there exists cross-coupling between the axes. The nonlinear dynamics of the system are first linearized and reformulated into an H∞ problem. A reduced order output feedback controller is then designed using the asymptotic time-scale and eigenstructure assignment (ATEA) technique. The overall design has been implemented using a personal computer with C++ and tested on the actual gyro-stabilized mirror system. Our simulation and implementation results show that the design is very successful.

scholarly journals Design and Implementation of LMI-based H2 Control for Vertical Nonlinear Coupled-tank System

2021 ◽  
Vol 10 (4) ◽  
pp. 0-0
Keyword(s):  
Output Feedback ◽  
Design Procedure ◽  
Feedback Controller ◽  
Linear Matrix ◽  
H2 Control ◽  
Output Feedback Controller ◽  
Design And Implementation ◽  
Tank System ◽  
Feedforward Controller ◽  
Mathematical Design

This paper presents the mathematical design and implementation of a robust H_2 output feedback controller for the vertical nonlinear coupled-tank system. Considering the growth of the complicated chemical processes in industries in the last decades, the necessity for the controllers with high robustness and proficiency is demanded. Therefore, to overcome some deficiencies of classical controllers such as Proportional Integral (PI), the robust H_2 output feedback controller is proposed to control the liquid level of the coupled tank system benchmark. Because of the nonlinearity of the system and the interactions between two tanks, the behavior of the controller in terms of the performance and disturbance rejection is on the main scene. The Linear Matrix Inequalities (LMI) is used to derive the design procedure. The effectiveness of the proposed approach in the setpoint tracking is highlighted in comparison with the PI plus feedforward controller and the acceptable results are achieved.

Switched Tracking Controller Design for Uncertain Systems

2010 ◽  
Author(s):  
Ehsan Azadi Yazdi ◽  
Ryozo Nagamune
Keyword(s):  
Output Feedback ◽  
Uncertain Systems ◽  
Optimization Problem ◽  
Controller Design ◽  
Dynamic Output Feedback ◽  
Robust Controller ◽  
Output Feedback Controller ◽  
Tracking Controller ◽  
Dynamic Output Feedback Controller ◽  
The Cost

In this paper, a problem of designing a switched tracking dynamic output-feedback controller for uncertain systems is considered. The design problem amounts to solving an optimization problem, the cost function of which is neither smooth nor convex. By applying the proposed method to a nominal switched controller design methods, we designed a switched robust controller. Advantages of the method demonstrated through an example.

Output-feedback based robust controller for uncertain DC islanded microgrid

2019 ◽  
Vol 42 (6) ◽  
pp. 1239-1251 ◽  
Author(s):  
Muhammad Mehdi ◽  
Muhammad Saad ◽  
Saeed Zaman Jamali ◽  
Chul-Hwan Kim
Keyword(s):  
Output Feedback ◽  
Feedback Controller ◽  
System Stability ◽  
Linear Matrix ◽  
Time Varying ◽  
Robust Controller ◽  
Dc Microgrid ◽  
Efficient Operation ◽  
Output Feedback Controller ◽  
Exogenous Disturbances

The integration of renewable energy resources to DC microgrid has captured the attention of the researchers in recent years. One of the active field of application of DC distribution is the islanded DC microgrid (DC ImG). The DC ImG present numerous challenges to researchers. Among many challenges, the regulation of voltage and stability of the system is indispensable to efficient operation. The voltage stability problem becomes more prominent when the system is exposed to disturbances and possess uncertainties in parameters. However, challenges can be overcome by skilful design of a robust controller for the system. Therefore, in this paper, an output-feedback based centralized robust control scheme is proposed. The proposed controller is designed to maintain good control performance in the presence of parametric uncertainties and exogenous disturbances. The uncertainties of the DC microgrid is modelled as a linear time-varying state-space system. The upper and the lower bounds of the time-varying parameters are determined by a Lebesque-measurable matrix. To attenuate the exogenous disturbances of the system [Formula: see text] based output-feedback controller is designed. The system stability is assured by the Lyapunov function candidate. The output-feedback controller needs only the voltage measurement; therefore, it requires less communication bandwidth as compared to the state-feedback. To obtain the controller parameters linear matrix inequality constraints are formulated and solved. The performance of the proposed controller is verified via simulations and compared with the existing schemes.

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