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This article presents a Robust Sliding Mode Control (RSMC) applied to a unified power flow controller (UPFC) to achieve rapid and finite time reference signal tracking of power flow in presence of plant uncertainties. RSMC is a nonlinear control based on the Lyapunov's stability and variable structure control theories to cancel disturbances and overcome the drawback of traditional linear PI control,...
Recommenders play a significant role in a trust management framework of a mobile ad hoc network, as a node may not have complete knowledge of all its neighbors since it might not have had any interaction with some of its neighbors. Some of the inherent characteristics of mobile ad hoc network like limited radio range, mobility and noise in the channel, contribute to the incomplete knowledge of a node...
A Loran-C system is a hyperbolic navigation system which works based on the TOA methods. The cycle identification and ECD estimation accuracies have considerable effects on the Loran-C system receivers localization accuracy so it is important to estimate the reference point and ECD as precisely as possible. White Gaussian noise degrades the performance of cycle identification and ECD estimation. Also,...
In this paper, we introduce an optimal beamformer design that facilitates a compromise between high directivity and low white noise amplification. The proposed beamformer involves a regularization factor, whose optimal value is determined using a simple and efficient one dimensional search algorithm. Simulation results demonstrate controlled tuning of various gain properties of the desired beamformer,...
Inhomogeneous current sharing between parallel IGBTs can compromise the capability of power modules to withstand short circuit events. Especially if the gate voltages are influenced by coupling effects, single IGBTs will carry excessive currents. This paper analyzes the effects of different parameters on the maximum short circuit current of a 1.7kV power module composed of three parallel half bridge...
The research on search and rescue after landslide is very important for improving the victims' survival rate. In this paper, the improved Truncated Lévy walks are used to simulate rescue teams' search behaviors. We propose a cooperative rescue plan based on distributed auction mechanism and simulate its effect in three disaster scenarios "fatal", "serious" and "normal"...
Interferometrie Synthetic Aperture Radar (InSAR) can derive accurate 3D information with image acquiring all time and all weather. But the accuracy of derived 3D information is heavily determined by the length of perpendicular baseline. We know that the longer baseline is, the more accurate Digital Elevation Model (DEM) can be derived in condition of other parameters are the same. Meanwhile the phase...
Single phase inverters are commonly used to transfer energy from a source to the crucial appliances or emergency power system. In this study a new model based robust controller for a single phase inverter under the constraint that the output filter parameters are not exactly known is presented. The nonlinear robust controller ensures the output voltage with lowest distortion, desired amplitude and...
Since input shaping control is based on open-loop control technique, robustness to modeling error is crucial for successful application of it. The robustness of input shaping control has conventionally been evaluated from the ratio of residual vibration amplitude with input shaping to that without input shaping. However there has been no serious consideration on robustness measures of input shaping...
In this paper, a super-twisting sliding mode controller with a time-varying sliding surface is proposed for electronic throttle control. The idea behind this control algorithm is to utilize a fuzzy logic controller to vary the sliding surface based on error variables, error and its first time derivative. The simulation results have confirmed the improved dynamic performance of the proposed control...
With decreasing size of transistors, the impact oftransient faults as well as the local and global variability of transistors increases, affecting system functions and performances. Formal verification may be used to prove that a circuit isrobust against transient and parametric faults. However, a modelincluding timing information combined with extracted electricalparameters is typically too large...
This paper proposes a lightpath threshold adaptation algorithm for dispersion-adaptive first-last fit spectrum allocation scheme in elastic optical networks in order to improve the performance in terms of call blocking in the network. The proposed algorithm adapts the suitable lightpath threshold value, denoted by β, according to the traffic condition in the network. The dispersion-adaptive first-last...
Existing power and rate control methods for wireless networks did not consider channel nonlinearity. This paper presents a power and rate controller for wireless networks with nonlinear channel fading. The controller is designed based on robust approach, and the performance is analyzed via linear matrix inequality (LMI). Simulation results illustrate the effectiveness of the proposed controller.
In this paper, in order to solve the path-following problem of underactuated surface ships, active-disturbance rejection control combining with the variable structure is proposed to steer a desired path. On the other hand, the uncertainties of internal dynamic and external disturbances can also be solved. In this way the needed setting parameters are greatly reduced with no change of the intrinsic...
This work proposes a method of automatic tuning for a dead-time compensator that can cope with stable, integrative and unstable process. At first, a identification method is devised and then simple tuning rules are defined to retune the controller. Furthermore, a performance assessment procedure is presented. Simulation results are presented to show the effectiveness of the method.
For non-square multivariable system, a design method of fractional order Smith predictor controller was proposed. Firstly, the structures of multivariable decoupling Smith predictor control and equivalent internal model control (IMC) were introduced. Then, the decoupler was deduced to achieve non-square system decoupling, and the model of decoupled system could be expressed as a square diagonal matrix...
The problem of generating a robust attack position plan for multi-UCAV cooperative attacking the moving target on the sea area is studied. There are many kinds of uncertain factors in the execution of multi-UCAV cooperative attack task, and the hostile target's maneuverability plays an important role. In order to handle the uncertainties in the cooperative attack mission well, a new approach based...
To improve the network invulnerability, most strategies are designed for optimizing the network capacity to prevent the cascade overload without considering the network robust under external attacks. To address this problem, based on the classical scale-free network model, this paper proposed a link-based network topology optimization algorithm referred as LNTO. The algorithm removed links among hub...
This paper presents modeling and control of a two-tank system. The system is a multivariable nonlinear system with parametric uncertainty. The control objective is to regulate the water level in each tank. First, a nonlinear geometric control law, exact feedback linearization is designed in inner loop to cancel the nonlinearity of nominal system. Then, two types of robust H∞ controllers (H∞ static...
A hybrid model is used for quantification of three resilience metrics: robustness, rapidity and resilience loss. The approach is demonstrated in a case study on a municipal electricity distribution system. An overall conclusion from the case study is that the suggested method provides an overview of the resilience metrics of the electricity distribution system and that it allows the network operator...
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