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In this paper, the stability problem of bilateral tele-operation systems with data sampling and communication time delays is considered. Two buffers are introduced in the bilateral teleoperation control framework to deal with the issue that the information transmitted between the master and slave sides suffer from time-varying delays. The mathematical model of bilateral teleoperation systems based...
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...
One of the major feature of DC microgrids is its high penetration of power electronic converters, as a result, the system inertia becomes a problem. In this paper, an admittance-type droop control with additional capability of introducing virtual inertia to the system. With the proposed method, each energy source will also contribute virtual inertia to the system, thus improving transient response...
In the DC distributed power system of the more electric aircraft (MEA), it is necessary to have a LC filter in the input of boost converter due to electromagnetic interference (EMI) and sharp input impulse voltage. Whereas, the interaction between boost converter and poorly damping filter may cause instability throughout the system., The problem may be solved by adding resistor or increasing capacitance,...
Renewable Energies (RE) are considered as an important alternative sources of energy for the generation of electricity such as hydrogen and photovoltaic energies. To ensure an efficient photovoltaic energy conversion several Maximum Power Point Tracking (MPPT) algorithms have been developed to incite the PV field to deliver maximum power. This paper presents a comprehensive comparative study of two...
The article considers existing simulation methods implemented under the conditions of the ensured uniformity and required accuracy of the results in the evaluation of the stability of functioning of the information structure security system in the conditions of negative influences. The evaluation of the sustainability of an information structure security system in terms of negative impacts is initially...
This paper presents the stabilization of three-dimensional fractional-order Lü chaotic systems, by means of an adaptive sliding mode based on Lyapunov stability theory. It focuses on an important issue in the research of fractional-order systems that is chaos stabilization. Based on the proposed adaptive sliding mode control method, the states of the fractional-order system have been stabilized; Numerical...
In this paper, the convergence and the stability analysis of two Induction Motor (IM) rotor time constant (Tr) estimators are performed. Both estimators are Model Reference Adaptive System (MRAS) based, first considering the rotor flux vector, second the reactive power as the state variable. The stability analysis is based on Lyapunov and Popov criteria, passivity formalism and positive real function...
The second-order Kuramoto oscillator models (KM) with diffusive and sinusoidal coupling were considered intensively in power networks. In this paper, the synchronization of an extended second-order Kuramoto oscillator model is studied using a parameterized approach. It is shown that the synchronization of the extended second-order KM is equivalent to the synchronization of a simple extended first-order...
The presence of both electronic-converter-based and rotating-machine-based energy sources in microgrids poses a challenge for its stable operation. Most of the stability studies in microgrids have been focused on the electronic converters interfacing a renewable energy source to an AC microgrid. However, the rotating machines are still a key component of many microgrids. This paper presents an induction...
In this paper, we present a novel image reconstruction algorithm for positron emission tomography(PET). Almost all of existing reconstruction approaches assume that the measurement model for PET is linear equation with Gaussian white noise or energy-bounded noise, which only approximates the emission and detection of PET very roughly. In fact, the real situation is much more complicated than the one...
In this paper a linear time delay systems of retarded type are presented as a potential model that can capture the behavior of human arm movement. The line tracking experiment is designed to validate the performance of the proposed model. The issue of stability of the time delay systems is presented and the critical delays curve is computed to indicate the stable region of the system in the delay...
Wind energy has attracted great interest as alternative source for electric power supply. However, its intermittent nature has been an issue of concern when integrated in power system. In this paper numerical technique based on generalised eigenvalues is used to investigate the influence of intermittent wind energy on small signal stability of power system. The result shows that the variation of power...
This paper reveals a kind of adjustable reactor. Firstly, it introduces the basic principle of the reactor. The reactor is based on a transformer with air gap. The current signal of primary side is detected and then directly injected into the secondary side. In this paper, the phase difference(caused by time delay) between the detected current signal of primary winding and the injected current signal...
The paper deals with the problem of reducing the order of an original high-order asymptotically stable linear switching system by independently approximating the (stable) LTI systems corresponding to every fixed value of the switching signal. Precisely, each reduced-order model is obtained by minimising the L2 norm of a weighted equation error by means of an efficient algorithm that ensures model...
Analysis methods for DC power interfaces using techniques built around the Nyquist stability criteria have previously been utilized to create system level specifications to ensure the stability of interconnected systems. This paper extends these concepts to not just ensure stability, but to also ensure a guaranteed maximum level of voltage and current perturbation within the system. The technique...
A method of adaptive backstepping sliding mode controller design is presented for dynamic positioning ship with nonlinear mathematical model and external uncertain disturbances. Firstly, the position deviation and velocity error are proposed, and the virtual control vector of two subsystems are defined. Secondly, the sliding mode surface switch function is designed. Then, adaptive controller is designed...
It takes an articulated dump truck with six wheels as a study object, full vehicle dynamic model using ADAMS software, hydraulic model using AMESim software and digital filter using Simulink are built. The test analysis of vehicle ride comfort and handling stability is processed through ADAMS / AMESim /Simulink co-simulation, and the response surface models of ride comfort and handling stability performance...
In this paper, the impact of initial states on the stability in cellular neural networks (CNNs) with time delay is studied in this paper. The relationships among the parameters of CNNs are investigated and defined. Based on the relationships, the ranges of the equilibrium points of every cell in CNNs with time-delay are considered. To ensure that n-cell cellular neural networks are locally stable,...
In order to reduce the initial disturbance and improve the stability of air defense missile, the missile launching equations of motion are derived and simplified using the method of modal substitution. Based on these equations, the coupled rigid-flexible dynamic modeling is built in the ADAMS software to analyze the dynamic behavior and stability of missile launching process. The results indicate...
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