The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The thickness of the boundary layer of the discrete-time Tracking-Differentiator is variable, so that the control characteristic line is asymmetric. In general, the nonlinear boundary transform is used to get the control synthesis function. However, it contains square root operations, and the compute is more complex. This study is conducted to put forward a new algorithm to simplify partition boundary...
This paper addresses the stability issues of delayed nonlinear systems of the form x(t) = A(t, x(t), x(t − d(t)))x(t)+B(t, x(t), x(t − d(t)))x (t − d(t)), that is, the system matrices depend on time and the present and past states. By means of a trajectory-based comparison approach, the stability of original nonlinear system is transformed into that of a positive linear system called comparison system...
This paper presents new constraints for Selective Harmonic Elimination (SHE)-PWM technique utilized in single phase applications. The proposed constraints eliminate all triplen harmonic orders naturally whereas they appear in all single-phase output voltage waveforms conventionally. The specified non-triplen harmonics are also eliminated through calculation of switching angles. Five-level high switching...
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...
The digital control power supply has been widely used by virtue of its many advantages. However, it may cause limit cycle oscillations due to quantization in the feedback loop when the switching frequency is high. This paper presents an analytical model of buck converter using state space average method and derives the equilibrium expression in steady state, and the requirement for DPWM resolution...
Non-inverting Buck Boost converters (NIBB) have been utilized as interfacing converters for energy storage, due to the high steady-state efficiency offered by the asynchronous control. However, classical asynchronous control has inherent poor dynamic performance when the input and output voltages are near. To solve the problem, concept of “dynamic mode switching” is first proposed in this paper. Instead...
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 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...
Present paper demonstrates the effectiveness of the predictive deadbeat current control for Permanent Magnet (PM) Brushless (BL) DC motor drive in injection of square-wave phase current even at higher speed as compared to conventional PI controller employed for phase current control. Effectiveness has been demonstrated in terms of capability of minimizing current ripples and torque ripples ensuring...
The second-order sliding-mode controller based on improved sub-optimal algorithm for synchronous Buck converte r is designed, and the converter can be controlled only by detecti ng the output voltage without measuring the capacitance current of the converter. By introducing hysteresis to sub-optimal algorit hm, the switching frequency of the converter is limited when the output voltage is stable....
For two-qubit systems with a degenerate measurement operator, this paper presents a control approach to achieve rapid stabilization to a target Bell state. This approach uses two control channels where the control laws associated with these two channels are designed as a constant and a switching control law, respectively. In the control scheme, the system state space is divided into two parts: the...
Independent mobility is important for the self-esteem and well-being of people with mobility impairments. For people with severe disabilities, there is a body of research investigating how best to share control of motion between a person with disabilities and a "smart wheelchair". Traditionally in "shared control", the control law is a linear combination of the human's intended...
This paper is concerned with the problem of the annular finite-time filtering for a class of switched systems by using an event-triggered communication scheme. Compared with the existing results of finite-time stability for the switched systems, during the specific time interval, the annular finitetime stability not only requires that the state trajectory does not exceed an upper bound but also is...
This paper concerns the control law design by variable structure control for a kind of uncertain discrete-time systems. Why the chattering shows up for this kind of systems by discrete reaching law is investigated, and then a developed variable structure controller is designed based on grey prediction iterative algorithm. Based on the grey prediction model, the parameter values are obtained. A criterion...
The paper is concerned with asynchronous control for fuzzy switched systems with actuator saturations. Based on controller-mode-dependent piecewise Lyapunov function, the asynchronous controllers are designed to ensure the exponential stability. The asynchronous controllers mean that the switching of the controllers has a lag with that of subsystem. Moreover, the corresponding switching laws with...
Delta sigma signal processing (DSSP) is a novel signal processing approach based on ΔΣ-bitstreams. In order to fully utilize the advantages of DSSP, a high bandwidth three phase hysteresis modulator was presented in literature. This modulator directly processes high frequent ΔΣ-bitstreams. A detailed description of the operation modes, the overmodulation range close to the voltage limit and the voltage...
To obtain a clear digital implementation structure for boundary control of dual-active-bridge converter (DAB), this paper proposes a finite-state-machine (FSM) model with excellent dynamic performance. It is based on a generalized way to analyze the natural switching surface (NSS) of DAB with explanation of its physical meaning. NSS illustrates the effect of charging and discharging of main energy...
Energy balanced control method for converters with natural trajectory tracking is presented in this paper, and is visualized to show converters' energy conversion inside converters. This paper specially designs and analyzes a single-phase full-bridge inverter based on energy balance with natural trajectory tracking. Natural trajectory tracking introduces a better dynamic response than the conventional...
The paper concerns the problem of the numerical simulation of hybrid systems with sliding modes. We give an overview of the numerical simulation procedures which have been described in the literature and next we present our proposition of the simulation code. What differs our solution from others is the utilization of differential-algebraic equations (DAEs) during the simulation of a sliding motion...
Guided bombs use different sensors as an input to correct its trajectory to a desired target. Some of them use optical sensors to compute the relative state between the guided system and the target. These systems usually use bang-off-bang controllers to align the line of sight towards the target, producing a quasi-straight path and a fixed attitude angle. The present work proposes an extension of...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.