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Modular multilevel converter (MMC) is a promising multilevel topology for high-voltage applications that has been developed in recent years. The control of MMCs has been analyzed in detail in many papers, showing that the converter capacitors can be kept charged and balanced by controlling the circulating current of each leg. The set-point signal of the circulating current is probably the most difficult...
Contact scanning scanners system can check deterioration of structure and inside matter during the production process. However, in case of high-speed scanning, oscillation occurs in the sensor part due to unevenness and friction on the measured surface. To overcome the problem, we have proposed an oscillation control scheme for scanning scanners system. In this paper, to show usefulness of the proposed...
This paper is concerned with chaos control of the oscillator circuit system. Firstly, the adaptive backstepping method is applied to control chaos, and an adaptive backstepping controller is designed based on the model of oscillator circuit system. Then, by discussing, we obtain that the controller can automatically turn on when the oscillator circuit system is in a chaotic state. Finally, numerical...
It is hypothesised that complex biological gene regulatory networks can be evolved from simple networks through modularisation, duplication and specialisation processes. However, the biological mechanisms of this process remain elusive and little work has been done to verify this hypothesis in a computational environment. This paper aims to couple two simple regulatory motifs, one toggle switch and...
This paper presents design and performance analysis of a modified reference model MRAC (M-MRAC) architecture for a class of multi-input multi-output uncertain nonlinear systems in the presence of bounded disturbances. M-MRAC incorporates an error feedback in the reference model definition, which allows for fast adaptation without generating high frequency oscillations in the control signal, which...
Recently a fourth circuit element, predicted four decades ago, has been discovered by HP researchers. This device, known as the memristor, is basically a resistance with memory that can be used as a tunable gain in control systems. In this paper the memristor experimental characteristic is modeled with a describing function and used to predict oscillations in closed loop systems with linear plants.
In this article we study a two-level driver model composed of one anticipatory and one compensatory control. The anticipatory control, executed in an open loop, is based mainly on the standard linear equations for the lateral dynamics of the vehicle. The compensatory control, executed in a closed loop, uses N PID controllers for the correction of lateral deviation, and other N PID controllers for...
The amplitude and frequency of weak signal is usually detected in strong noise. And the detection method of frequency is less to be researched. In this paper we use Rossler chaotic oscillator and proportional differential control to detect the frequency of the weak signal. At first we control Rossler system to critical state from periodic state to chaotic state. Then the unknown signal is put to the...
A class of mechanical systems with many unactuated degrees of freedom is studied. An analytical method for computing coefficients of a linear controlled system, solutions of which approximate dynamics of transverse part of coordinates of an underactuated mechanical system along a feasible motion, is proposed. The procedure is constructive and is based on a particular choice of coordinates in a vicinity...
In this paper we use fusion technology based on Rossler chaotic oscillator and proportional differential control technology to detect the frequency of the weak signal. The dynamic character of Rossler equation is analyzed and it is immune against the white noise and the interference signal having larger frequency difference with the intrinsic frequency of chaotic oscillator. And proportional differential...
Network optimization especially in power industry is one of the main goals of system engineering. It not only reduces the cost of the system but also improves its stability. Among various methods of optimal control of power networks, like Linear Optimal Control (LOC), a model-based adaptive optimal method has been presented here which can also be used in multi machines systems with multimode high...
A delay-locked loop of multi-band selector with wide-locking range and low power dissipation is presented. The architecture of the proposed delay-locked loop consists of phase frequency detector, charge pump, band selector, multi-control delay line, and start-up circuit. The multi-band selector is used to extend operation frequency of delay-locked loop by switching the multi-control delay line. The...
This paper presents an analytical modeling of ballistic and quasi-ballistic transport, implemented in Verilog-A environment and used for circuit simulation. Our model is based on the Lundstrompsilas approach and uses an expression of the backscattering coefficient given by the flux method. The model takes also into account short channel effects and tales into account the effects of different scattering...
Self-adaptive systems are capable of changing their behaviour at runtime to meet target constraints. An important research question is how quality of service models can inform runtime adaptation. We sketch one solution to this question by application of control theory to improve performance of queued systems by means of architectural adaptation. Previous research by our group has shown how Auto Regressive...
The current engine systems to achieve extremely low emission has a wide range λ sensor positioned upstream of a catalyst and a switching λ sensor downstream. The system is required to maintain the output of the switching λ sensor to optimal target value under all engine load and catalyst aging conditions in order to optimize the conversion rate of catalyst. A standard STC (Self-Tuning Controller)...
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