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Networked teleoperation with haptic feedback is a prime example for the emerging Tactile Internet, which requires a careful orchestration of haptic communication and control. One major challenge in this context is how to maximize the user's quality-of-experience (QoE) while ensuring at the same time the stability of the global control loop in the presence of communication delay. In this paper, we...
In this paper, the problem of robust sliding mode control is studied for a class of discrete delayed nonlinear systems subject to randomly varying nonlinearities (RVNs) under uncertain occurrence probability. Here, the time-varying delay is bounded with known upper and lower bounds. The RVNs under uncertain occurrence probability are characterized by utilizing a Bernoulli distributed random variable,...
It is well know that the interaction between poorly damped LC input filter with dc-dc converter lead to degradation of dynamic performance and fault scenario of the system. This problem also often occurs in fuel cell systems. Due to the relatively low and unregulated output voltage, the high gain boost converter is need in such application. A floating interleaved boost converter (FIBC) is selected...
For stability analysis of discrete-time arbitrary switching positive linear systems, we introduce a new class of switched copositive Lyapunov functions (abbreviated as CLFs) and we investigate their test power. The new class means “switched max-type CLFs” and it is defined by generalizing the “mode-independent max-type CLFs” (that were introduced and characterized by our previous works). This generalization...
Sub-harmonic oscillation is a key factor causing instability for current-mode controlled single-inductor dual-output (SIDO) Buck converter. To inhibit the sub-harmonic oscillation of the converter and to extend its stable operating range, the ramp compensation technique is introduced in this paper. The discrete iterative map model of current-mode controlled SIDO Buck converter with ramp compensation...
A switching adaptive controller is proposed to control the phase currents in brushless DC motor (BLDCM) drives. After deriving the error dynamics, the conduction and commutation periods of the drive is taken into account separately, and two different controllers are designed for each operation region of the current loop of BLDCM drives. All the system constants in the dynamical model of the drive...
Medium/High power converters usually employ low switching frequency to reduce power loss, resulting in large system delay in their control system. The multi-sampling technique is an effective method to reduce the system delay while this will make the system a Linear Periodic Time Varying (LPTV) system. Modeling this kind of system by using LTI modeling method, such as Laplace transform, Z-transform,...
In this paper, the unknown input observer design problem for the discrete-time switched system is considered. Firstly, the stability analysis based on multiple discontinuous Lyapunov function is discussed for the discrete-time switched system under the mode-dependent average dwell time concept. Then, based on such the stability analysis method, a reduced-order observer is constructed. Based on the...
This paper investigates the consensus problem of multiple uncertain Lagrangian systems with switching topologies. Due to the discontinuity resulted from switching topologies, achieving consensus in the context of uncertain Lagrangian systems is challenging. We propose a new adaptive controller based on dynamic feedback to resolve this problem and additionally propose a new analysis tool for rigorously...
A fixed-time sliding mode control scheme is designed in this paper for the high-order linear systems in the pure-feedback form with system uncertainties. A recursive procedure is utilized where a set of switching manifolds have been resorted to realize the fixed-time stability. The initial conditions of the system variables are confined in a particular region so as to avoid the singularity problem...
The problem of control system design is discussed for a high frequency DC-DC converter which is based on the push-pull circuit with autotransformer. The proposed converter may be used as a battery discharge unit in power supply system of satellites. The mathematical model of the converter is described. The proportional-integral (PI) current controller and PI voltage controller are designed based on...
This work is concerned with dynamic output feedback control for a class of switched systems with mode-dependent average dwell time switching. By constructing a quasi-time-dependent Lyapunov function, the issues of global uniform exponential stability and ℓ2-gain analysis for the switched system are addressed firstly. Then a set of reduced-order output feedback controllers is designed, which is both...
This paper focuses on regulation regimes of the transformer's secondary voltage. Automatic transformer's voltage regulation circuit is studied and upgraded.
The predefined-time stabilization of second-order systems, i.e. the fixed-time stabilization with settling time as a function of the controller parameters, is revisited in this paper. The proposed controller is a time-based switched controller which first drive the system trajectories to a linear manifold in predefined time and then uses a nested second-order controller. The application of the results...
This paper overviews the literature pertaining to the stability analysis of systems with delay-dependent coefficients, which can arise from various scientific and engineering applications. Research on Stability analysis for systems with a single delay is first reviewed, followed by a discussion of some techniques also applicable to the multiple-delay case. We attempt to provide the main ideas of various...
This paper addresses the positioning control problem for a direct-drive linear switched reluctance machine (LSRM) system based on the vectorization technique. The stability conditions for LSRM motion control system are obtained based on Lyapunov stability theory. The positioning controller design method for the closed-loop system is given according to the matrix eigenvalue numerical analysis method...
We consider the robust control design for the boost-pressure control of an exhaust-gas turbocharger of an internal combustion engine. We design a sliding-mode controller using the super-twisting algorithm. In our main contribution we present a thorough stability analysis based on two different Lyapunov functions, one for the reaching phase and one for the sliding-phase. Additionally, we consider state-constraints...
The mathematical modeling of fuzzy system is researched by means of T-S model. The hybrid control theory is quoted to research the discrete fuzzy systems, and the stability of the fuzzy system is analyzed by Lyapunov function, and the sufficient conditions for the control design method and the stability of the system are obtained. By using the switching law design, the closed-loop system is asymptotically...
In this article, the output-feedback stabilization problem is investigated for discrete-time interval uncertain positive systems under the performance. First, we propose some conditions expressed by linear programming to ensure the asymptotic stability and the ℓ1 performance for given positive systems. Then, we establish a novel design approach and an iterative algorithm to obtain the desired output-feedback...
In this paper, the concept of global asymptotic stability in probability (GAS-P) is investigated for a class of nonlinear switching and impulsive systems with random disturbances, whose second-order moments are finite. Using average switching and impulsive interval approach, we show that when the average interval is large enough, a switching and impulsive system is GAS-P if all of its constituent...
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