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Solid state transformers (SSTs) can be interconnected with each other through a distribution feeder to form a smart grid. When the main grid is disconnected, SSTs form an islanded microgrid. With available communications, master-slave microgrid control structure can be adopted. The system-level stability analysis can be simplified by considering only the grid interface stage of the SST. The loop feeder...
This paper presents the implementation of a nonlinear robust controller in a boost converter, which operates in an uncertain environment. The proposed controller deals with uncertainties, which are unknown but bounded, and occur in the input voltage and the output pure resistive load. Mathematical proof of the efficiency of the controller and quantitative results about the amount of the uncertainty...
Arms race is a typical conflict among rational and non-myopic decision-makers (DMs). Nevertheless, the assumption of basis graph model for conflict resolution (GMCR) is not suitable for this issue that each DM possesses identical priority disregarding the difference of their capabilities. In order to handle with this drawback, this paper proposes a novel methodology, entitled capability-based GMCR...
For the missile system with external disturbances and parametric uncertainties, the problem of composite anti-disturbance autopilot design is considered with angle constraint. First, a nonlinear disturbance observer is designed for missile system. Second, using dynamic surface control technique, a composite anti-disturbance autopilot is developed for missile systems. Third, the stability analysis...
This paper proposes a control method that compensates for a system with time delay by predicting the future states of the plant. The proposed method contains a state predictor that predicts the future values of a system. Furthermore, the proposed method also considers the uncertainty of the model in terms of the modeling error, which might cause the predicted value to degrade the performance of the...
The design of adaptive sliding mode control is studied for a class of Markov jump systems(MJSs) with transition rate uncertainties and the partial failures of the actuators. Firstly, the mathematical model of MJSs with the uncertainty of the transition rate and the partial failure of the actuator is established. Secondly, the sliding surface is proposed by combining linear matrix inequality (LMI)...
This paper investigates the mean-square stabilizability of a networked discrete-time linear feedback system with multi-step random delay induced by a communication channel. It is assumed that the probability mass function (PMF) of the random delay is known. According to this model, an averaged channel transfer function and the spectral density of the channel uncertainty caused by the delay are obtained...
This work investigates the adaptive finite-time tracking problem for a class of strict-feedback nonlinear systems with parametric uncertainties and symmetric constant output constraint. A tan-type Barrier Lyapunov Function (BLF) is proposed to ensure the boundedness of the output tracking error, and a new tuning function is given to eliminate the effect of uncertainties. It is theoretically shown...
In the paper, we address the attitude control and momentum management problem of the spacecraft with patrial sate information. A three-axis coupled nonlinear dynamics subject to various uncertainties is investigated, and the ADRC technique is applied. The proposed control scheme synthesizes a linear quadric regulator controller, a ΜΙΜΟ-type extended state observer and a novel compensator, which only...
Inter-laboratory comparisons are important to evaluate the capabilities of EMC test laboratories. In this contribution, we present a device for such comparisons which is able to assess the test capabilities of a laboratory according to the IEC 61000-4-3 standard. The device is intended to be tested as a normal EUT. It is equipped with appropriate detecting mechanisms that record all important parameters...
The model-based event-triggered strategies have been developed as an alternate for Zero-Order-Hold (ZOH)- based event triggered scheme in continuous-time for multi-agent systems (MAS). However, traditional event-triggered schemes need the knowledge of system dynamics whereas model-based schemes are sensitive to model uncertainties. Therefore, in this paper, a novel distributed robust event-triggered...
FGATool is a MATLAB tool for graphical analysis of systems represented with transfer functions having orders of integer and fractional numbers. It offers easy-to-use tools for students and researchers working in the field of system analysis. This paper presents the motivation of its development, an overview of the uncertainty module of the toolbox and the relation with existing tools concerned to...
This paper presents a fuzzy gain scheduling PID controller for a gimbal stabilization platform. A fuzzy method is used to calculate the main controller parameters based on the close loop error, as well as its derivative. A comparison between this method and other conventional controllers used for this application is made focused on robust stability. Finally, a complete implementation over an embedded...
This study is aimed to find low order, stable and proper controllers for the linearized models of two well known underactuated robots i.e. Acrobot and Pendubot around their upright equilibrium points in order to maximize the robustness of the feedback loop to uncertainties. The proposed method makes use of the robust stabilization of finite dimensional plants by Nevanlinna-Pick interpolation problem...
A model-based control design method is developed for nonlinear reactive sputter processes that can be modelled by a nonlinear ordinary differential equation with linear input and stable and unstable equilibrium states. The controller shall robustly stabilize the unstable working points. Lyapunov's direct method is used to formulate stability conditions that respect possible uncertainties in the process...
An output-feedback control system for uncertain single-input-single-output linear systems with arbitrary delay in the output signal is developed. The state of the system is estimated by observers connected in cascade. Unlike previous works, parametric uncertainties are allowed. Their effects are analyzed by using the Small-Gain Theorem. The proposed control strategy guarantees global stability of...
The paper concerns the development of a adaptive sliding mode control based on super twisting (ASTW) and can be applied to a Human-Driven Knee Joint Orthosis. Therefore, a model of the shank-orthosis system is given considering the human effort as an external torque acting on the system. The main objective of this paper is to bring together two approaches to reduce the phenomenon of chattering, adaptation...
The purpose of the paper is to propose a new control scheme in active front steering (AFS) for vehicle stability using disturbance observer method. In the paper, the ideal yaw rate can be calculated on the linear two-degrees-of-freedom vehicle model. In addition, the actual sideslip angle can also be estimated by using a state observer. Based on this, two kinds of baseline AFS controllers are proposed...
An active disturbance rejection controller (ADRC) is designed and originally implemented on a real torsional plant. The torsional plant resembles the dynamics of a rotational system. Due to mass imbalance, centrifugal imbalance, and the non-coincidence between the principal and geometric axes of a rotating disc, the system parameters of this torsional plant are varying constantly. In addition, an...
Chaos synchronization of uncertain fractional order chaotic systems subject to modelling uncertainty is investigated. A novel synchronization strategy based on fractional sliding mode control is developed for fractional order chaotic systems. Sliding mode control is generalized to fractional order systems, and fractional order sliding mode reaching law and fractional order sliding mode surface are...
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