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A robust and effective evaluation method for the safety of optimal generation scheduling has great potential on optimizing operation of electrical power and energy system. Based on the concept of transmission capacity margin, a robust model of transmission capacity margin evaluation (TCME) is established to assess the overload risk of transmission lines when loads fluctuate. This TCME method can provide...
This paper concerns disturbance rejection for a repetitive-control system (RCS) with unknown time-varying uncertainties and nonlinearity. The design of the RCS is based on the concept of equivalent input disturbance (EID). First, an EID estimator is constructed through a state observer with dynamic coefficient matrix that effectively estimates the total effect of the uncertainties and nonlinearity...
This paper addresses robust consensus for a class of linear multi-agent systems (MASs) with uncertainty in communication network. It is suppose that the weighted adjacency matrix of the MAS is known to lie within an uncertainty polytope. Base on the Lyapunov stability theory combining with homogeneous parameter-dependent (HPD) Lyapunov functions, necessary and sufficient conditions for ensuring robust...
In this paper, the distributed h∞ composite-rotating consensus problem is concerned for a class of second-order multi-agent systems. Firstly, based on local state feedback and communication feedback, a distributed control algorithm is proposed. Then, sufficient conditions are derived in order to make all agents reach a composite-rotating consensus with the desired h∞ performance. Finally, the simulations...
We exploit how to overcome phase damping decoherence when the phase damping parameters are uncertain. It is shown that the “relaxed” control goal may be achieved by combing simple open-loop coherent control with periodic projective measurements. Both the sufficient conditions and constructive design procedures are presented. The control design is reduced to selecting the period of projective measurements...
This paper presents a variable coefficient nonsingular fast terminal sliding mode (VCNFTSM) control method with the extended state observer (ESO) for a class of second-order uncertain SISO nonlinear systems subject to external disturbance. First, a new variable coefficient double exponential reaching law is combined with NFTSM surface function to get finite time fast convergence in both reaching phase...
This paper studies the attitude control problem for the longitudinal motion of a hypersonic aircraft model containing 28 inertial and aerodynamic uncertain parameters given by NASA Langley Research Center. To handle the nonlinear dynamics and uncertain parameters, ADRC for the unobservable and unmatched disturbance is designed. Besides, the properties of the closed-loop system is discussed in two...
For a novel conveying mechanism which is highly nonlinear, highly time-varying and highly coupled, a synchronized sliding mode control with nonlinear disturbance observer is proposed to improve the synchronization performance and the disturbance-rejection performance. First, the kinematic analysis of the conveying mechanism is completed and the dynamic model with lumped disturbances of the conveying...
Small gain theorem is used to interpret stability and robustness of linear active disturbance rejection control(LADRC). For the case linear unmodeled dynamic and additive external disturbance, LADRC system is decomposed into two interconnected subsystems. The first subsystem includes all parametric uncertainty of the plant, while the second has a gain which can be adjusted by choosing the parameters...
This paper aims to study the robust nonfragile H∞ controller design problem for a class of uncertain discrete-time nonlinear singular systems. A Takagi-Sugeno (T-S) fuzzy singular model with norm-bounded uncertainties is employed to represent a nonlinear plant. Basing on observers for the fuzzy model, we can construct a fuzzy controller with uncertainties existing in the implementation process. A...
In this paper, a feed-forward disturbance compensation model predictive control (MPC) method is proposed for rudder roll stabilization (RRS). Rudder roll stabilization is an underactuated problem with actuator saturation, the roll and heading of ship will be controlled by the rudder with limited rudder angle and rudder rate. MPC deals with the underactuated and constrained problem elegantly by means...
Model inaccuracies or parameter uncertainties are unavoidable in the practical control systems, while the uncertain properties could be modeled and estimated by the grey system. Among many grey models, fractional grey model is recently proposed and popularly used in many model analysis and prediction problems. In this paper, the structure uncertainties and external disturbances are considered using...
A robust entry guidance law with finite time convergence is designed for drag-tracking in this paper. The bank angle is regarded as the control variable. First, a robust sliding mode control (SMC) method, which can guarantee the finite time convergence, is proposed for a class of nonlinear systems with uncertainties and disturbances. Then, after the drag dynamics is given, the finite time guidance...
A robust direct adaptive attitude law is implemented in a attitude control system simulator. The meaning of robustness here is with respect to uncertainties in the inertia of the satellite. The controller has already been proved to be more robust than a corresponding robustly stabilizing static output feedback. The aim of the study is to show that in practice as well, only the adaptive controller...
Over the last few years, the combination synchronization of chaotic system receives a special attention. This paper introduces the idea of combination synchronization into complex networks. Based on sliding mode control (SMC) principle, the finite-time combination synchronization (FTCS) of four uncertain complex networks which combining as the form of A+B+C-D is investigated. And there are unknown...
This paper develops two robust adaptive controllers for UAVs. The first controller is the robust adaptive PID based on fuzzy logic. The other is the intelligent flight controller based on ANFIS. The simulation results exhibit the robustness of the developed controllers. Likewise, the results present that the intelligent flight controller based on ANFIS produces better robustness performance than robust...
Attitude control is essential for spacecraft to accomplish various tasks, and the attitude tracking is one of the most important attitude control tasks. In this paper the attitude tracking of a rigid spacecraft with bounded input is examined. At the same time, the unknown external disturbances are finite, but their boundaries are unknown. In order to make sure the attitude tracking errors converge...
Quantum robust control has been recognized as a critical issue in quantum systems, since many quantum systems are unavoidably subject to disturbances and uncertainties in practical applications. Considered uncertainty of Hamiltonian in the Markovian quantum system, on one hand this paper define the control effect based on fidelity, purity and degree of coherence, on the other hand design control scheme...
A robust constrained multi-model switching control scheme is proposed for the near space vehicles (NSV) with variable sweep angle, unknown external disturbances, system uncertainties, input and output saturation. The sliding model disturbance observer (SMDO) is designed to estimate the compounded disturbances including unknown external disturbances and system uncertainties. To eliminate the effects...
In recent years, wireless power transfer systems have successfully been used in various industrial applications due to their contactless power transfer feature. However, these systems behave as higher order resonant networks and hence are highly sensitive to changes in system parameters. Traditional PID controllers often fail to maintain satisfactory power regulation in the presence of parametric...
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