This paper presents a nonlinear H ∞ state feedback attitude control design method for spacecraft large angle maneuvers, which is subject to moment-of-inertia (MOI) uncertainty. Moreover, the operation of attitude man...
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This paper presents a nonlinear H ∞ state feedback attitude control design method for spacecraft large angle maneuvers, which is subject to moment-of-inertia (MOI) uncertainty. Moreover, the operation of attitude maneuver is affected by external disturbances. The attitude control design thus employs a nonlinear H ∞ method to achieve stability and robustness so that both MOI uncertainty and external disturbances can be accounted for. In the paper, a solution for robust spacecraft attitude control is conjectured and shown to satisfy the nonlinear H ∞ criterion. This results in a nonlinear H ∞ control law that is capable of robustly stabilizing the maneuver in the presence of external disturbance and spacecraft inertia uncertainty. The simulation results are presented to demonstrate the effectiveness of the proposed design method.
In this paper we investigate the design of robust state feedback control strategies for a general model of Autonomous Underwater Vehicle using Lyapunov techniques. More precisely, we first define a nonlinearcontrolle...
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In this paper we investigate the design of robust state feedback control strategies for a general model of Autonomous Underwater Vehicle using Lyapunov techniques. More precisely, we first define a nonlinearcontroller on the basis of a nominal model, and then, after introducing a suitable representation of model uncertanties, we evaluate its robustness properties by means of Lyapunov techniques. Then, we derive, by Lyapunov design, a modified controller which guarantees ultimate uniform boundedness of the tracking error against plant perturbations. The effectiveness of the proposed methodology is proved by discussing a case study and related simulation results.
In this paper we generalize the Hill-Moylan-Willems framework for dissipative systems to accommodate L ∞ criteria, and a mixture of L ∞ and integral criteria. The generalized dissipation property is completely chara...
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In this paper we generalize the Hill-Moylan-Willems framework for dissipative systems to accommodate L ∞ criteria, and a mixture of L ∞ and integral criteria. The generalized dissipation property is completely characterized in terms of a partial differential inequality, interpreted in the viscosity sense. These results are then applied to derive a state feedback synthesis procedure using a minimax version of the PDI. This gives a framework for mixed L ∞ -bounded/integral robustcontrol design, and in particular, for L ∞ -bounded robustcontrol design.
The problem of transient stability for a single machine infinite bus system with static VAR compensator(SVC) is addressed in this *** the system,the damping coefficients are measured inaccurately.A nonlinearrobust co...
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The problem of transient stability for a single machine infinite bus system with static VAR compensator(SVC) is addressed in this *** the system,the damping coefficients are measured inaccurately.A nonlinear robust controller and a parameter updating law are obtained simultaneously based on modified adaptive backstepping and Lyapunov *** system does not need to be linearized and the closed-loop error system is guaranteed to be asymptotically *** results demonstrate that the proposed method provides better system response and robustness than the design based on conventional adaptive backstepping method.
For the nonlinear robust control difficulty in the MIMO system, which has many uncertain parameters, the state extending and filtering robustcontrol(SEFERC) is proposed. The uncertain nonlinear part of the MIMO is ex...
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For the nonlinear robust control difficulty in the MIMO system, which has many uncertain parameters, the state extending and filtering robustcontrol(SEFERC) is proposed. The uncertain nonlinear part of the MIMO is extend to the new state parameter and can be estimated. With the estimated value, combined with the direct feedback linearization(DFL), the nonlinear system can convert to the linear system. According H∞ control method, the robustcontrol of the linear system is realized. Taking the certain excitation and speed coordinated control system for example, simulation results show that the SEFERC can accelerate the convergence speed of the state variables and can improve the excitation and speed coordinated control speed as illustrated by the portions given in this document.
The problem of transient stability for a single machine infinite bus system with static VAR compensator (SVC) is addressed in this paper. In the system, the damping coefficients are measured inaccurately. A nonlinear ...
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The problem of transient stability for a single machine infinite bus system with static VAR compensator (SVC) is addressed in this paper. In the system, the damping coefficients are measured inaccurately. A nonlinear robust controller and a parameter updating law are obtained simultaneously based on modified adaptive backstepping and Lyapunov methods. The system does not need to be linearized and the closed-loop error system is guaranteed to be asymptotically stable. Simulation results demonstrate that the proposed method provides better system response and robustness than the design based on conventional adaptive backstepping method.
The presence of input delay, also known as dead time, complicates the control of processes. To attenuate this problem, predictor structures are used. They allow the control of this type of process with a delay-free no...
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ISBN:
(纸本)9781509007561
The presence of input delay, also known as dead time, complicates the control of processes. To attenuate this problem, predictor structures are used. They allow the control of this type of process with a delay-free nominal model, which simplifies the control design. MPC algorithms implicitly define a predictor structure, however, because of how it uses the past system information, the predictor can compromise the robustness characteristics of the closed-loop system. In this paper, the authors propose the substitution of this implicit predictor by a nonlinear Filtered Smith Predictor (NLFSP) that, if appropriately tuned, can improve the overall robustness of the system.
In this paper, the nonlinear robust control approach is adopted to Advanced Var compsator (ASVG) control. Based on the power system dynamics, the framework of dissipative system theory and the approach of nonlinear di...
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In this paper, the nonlinear robust control approach is adopted to Advanced Var compsator (ASVG) control. Based on the power system dynamics, the framework of dissipative system theory and the approach of nonlinear disturbance attenuation in the sense of L2-gain, the robustcontrol dynamic model of ASVG in a one-machine, infinite-bus system has been established. The torque disturbance acting on rotating shaft of the generator set and the disturbance to output voltage of ASVG are considered in the model. A recursive approach is applied to construct the energy storage function of the system such that the solution of the control problem is acquired, which avoids the difficulty from solving Hamilton-Jacobi-Isaacs inequality. Thus, the nonlinear disturbance attenuation control strategy of ASVG is obtained. The simulation results demonstrate that ASVG with the proposed controller can more effectively improve the voltage stability, damp the oscillation, and enhance the transient stability of power systems.
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