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International Review of Automatic Control - Papers
Analytical
Formulation of Mikhailov and Nyquist Criteria for
-stability
by Arie Nakhmani,
Michael Lichtsinder
Vol. 2. n. 5, pp. 497-504
Abstract - This work is concerned with the stability analysis of linear time-invariant (LTI) systems, and more generally with the clustering of open loop and closed loop poles inside an arbitrary bounded symmetric contour ∂Γin the complex plane. The stability criterion is formulated for the direct and inverse generalized Bode diagram (constructed on ∂Γ instead of for the regular Bode diagram). In generalized Nyquist theorem, we use an alternative technique jω for encirclement counting of (-1, j0) point in complex plane, by checking the generalized phase intersections with {180°+360°k:kєZ}lines. This technique allows us to develop the theorems analytically. Using the analysis in this paper, we can ensure both stability and transient response specifications at the same time.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: LTI, Stability, Nyquist Criterion, Generalized Bode Diagram.
Support
Vector Machines for Failures Diagnosis
by Jihane Ben
Slimane Dhifallah, Kaouther Laabidi, Moufida Ksouri Lahmari
Vol. 2. n. 5, pp. 505-511
Abstract - The classifiers with supervised learning have proved to be efficient for the distinguishing of faces on the images, speakers' identities and characters recognition. The idea of the present work is to extend their application field to failures diagnosis liable to arise during the work of complex industrial processes. For this reason, we propose to use the support vector machines classifier "SVM". This method will be applied to two systems, including a hybrid one. We will also focus on detecting the liable oncoming failures.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Failures Diagnosis, Classification, Pattern Recognition, SVM Multiclass, Algorithm One Against One.
by Mojgan Hojabri , Hashim Hizam , Norman Mariun , Senan Mahmod Abdullah
Vol. 2. n. 5, pp. 512-516
Abstract - Fast and accurate algorithms to compute Available Transfer Capabilities (ATC) are important for electricity markets. Most studies involved load flow based and contingencies that often can be performed in reasonable time with the use of linear methods. This paper presents a simple and accurate method for calculating ATC with a linear optimization method. Since the limitations of linear ATC calculations is the error produced by neglecting the nonlinear nature of real power flows. This paper presents Krylov Subspace methods that can reduce this error. By applying these methods for calculating ATC, the speed and the accuracy of them are calculated and compared to find the best one. All computations are tested on IEEE-30 bus system in MATLAB 7.1.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Available transfer capability (ATC), Transmission Capability Margins, Krylov Subspace, iteration methods, linear optimization programming, power system reliability.
Mitigation
of Sub-synchronous Oscillations by Linear Optimal Control with
Determined Degree of Stability
by Javad Sadeh,
Iman Mohammad Hoseiny Naveh
Vol. 2. n. 5, pp. 517-522
Abstract - In this paper, an innovative method is proposed to improve the performance of linear optimal control for mitigation of sub-synchronous resonance in power systems. This method is based on shifting eigenvalues of the state matrix of system to the left hand-side of s plane. It is found that this proposed controller is an extended state of linear optimal controller with determined degree of stability. A proposed design, which is presented in this paper, has been developed in order to control of severe sub-synchronous oscillations in a nearby turbine-generator. The proposed strategy is tested on second benchmark model and compared with the optimal full-state feedback method by means of simulation. It is shown that this method creates more suitable damping for these oscillations. The proposed method is applied to the IEEE Second Benchmark system for sub-synchronous resonance studies and the results are verified based on comparison with those obtained from digital computer simulation by MATLAB.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Sub-synchronous resonance, Sub-synchronous oscillations, Optimal full state feedback, Linear optimal control with determined degree of stability, Extended optimal control.
New
Intelligent Economic Modelling Techniques: Fuzzy Cognitive Maps Face the
Question of the Greek Current Account Deficit Sustainability
by
Nicos H. Mateou, George A. Zombanakis
Vol. 2. n. 5, pp. 523-534
Abstract - This paper offers an alternative approach to policy modeling aiming at considering the question of the Greek current account deficit sustainability using Fuzzy Cognitive Maps (FCM). Given that the large Greek current account deficit figures reported during the past few years have become the source of increasing concern regarding its sustainability and bearing in mind the wide variety of views on this issue, we have chosen to resort to an entirely different technique compared to traditional policy modeling. The paper concludes that despite its size, the current account deficit of Greece can be considered sustainable. This conclusion, however, must not be taken as neglecting the structural weaknesses that lead to such a deficit. In fact, even in the absence of any financing requirements these high deficit figures point to serious competitiveness losses with everything that these may entail for the future performance of the Greek economy.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Tem Soft Computing, Fuzzy Cognitive Maps, Current Account Deficit Sustainability.
New Approach for a Supervisor of the PI Controller Parameters Applied
for Induction Motor
by Kouider
Laroussi, Mimoune Zelmat, Ahmed Hafaifa
Vol. 2. n. 5, pp. 535-541
Abstract - The simplicity of traditional controllers makes of them the popular and the most used solution in the industry of nowadays. However, they suffer from some limitations and can not deal with nonlinear dynamics and system parameters variation. In the literature several strategies of adaptation are developed to alleviate theses limitations. In this paper we propose a combination of two strategies for supervision and adaptation of PI parameters. We apply the obtained structure to the control of induction machine speed.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Induction motor, Fuzzy control, Hybrid control, Field orientation, Supervisor.
Position Sensorless Fuzzy Logic Control Based on a Nonlinear Observer
for a Permanent Magnet Stepping Motor
by A. Mbarek, K.
Ben Saad, M. Benrejeb
Vol. 2. n. 5, pp. 542-551
Abstract - This paper deals with a position sensorless fuzzy logic control approach allowing the damping of a stepping motor position evolution. The fuzzy logic controller uses the back EMF voltages and the back EMF change as inputs to avoid the use of a position sensor which is cumbersome and very expensive. Moreover, a nonlinear observer is proposed in order to estimate the motor’s back EMF voltages from the motor statoric currents and voltages. The performances of the sensorless position fuzzy logic controller and the nonlinear observer are tested by numerical simulations. The obtained results show the efficiency of the proposed control law.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Position sensorless control, Nonlinear observer, Fuzzy logic control, Overshoot, Stepping motor, Back EMF voltages.
Robust PI-Like Fuzzy Logic Controllers for High Frequency Inverter for Induction
Heating Application
by M. Helaimi, M.
Benghanem, B. Belmadani
Vol. 2. n. 5, pp. 552-560
Abstract - This paper proposes an effective control system for full bridge series resonant inverter for induction heating applications, which used variable frequency variable duty cycle. This system has two control loops: The frequency control loop ensures Zero Voltage Switching (ZVS) for all load conditions and the Asymmetrical Duty Cycle (ADC) control loop based on the mamdani fuzzy model and the centroid of the area deffuzification method to control the output power. The complete closed-loop model is obtained using the extended describing function method. The validity of the proposed control was verified by simulation results.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Induction heating, Resonant inverter, Fuzzy logic controller, PLL, Simulation.
Identification of Natural Frequencies and Damping Ratios of Multi-Mass Systems
Using Wavelet Transform
by H. Loussifi, K.
Nouri, R. Dhaouadi
Vol. 2. n. 5, pp. 561-567
Abstract - In this paper an identification method based on Wavelet Transform (WT) for a motor drive system is developed. It is shown that the WT of the free response of the system considered allows the estimation of the natural frequencies and damping ratios. The accuracy of the developed method is confirmed by applying it to an elastic Two Mass Model (2MM) and Three Mass Model (3MM). The obtained simulation results verify the effectiveness of the developed identification method.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Wavelet Transform, Modal parameters, Multi-mass models, Friction damping.
Stabilization
of an Under-Actuated X4-Flyer Using Adaptive Fuzzy Sliding Mode
Controller
by M.
Tahar, K. M. Zemalache, A. Omari
Vol. 2. n. 5, pp. 568-576
Abstract - The drawbacks of Sliding Mode Control (SMC) in terms of high control gains and chattering are overcome by merging of the Fuzzy Logic Controller (FLC) with the variable structure of the SMC to form a Fuzzy Sliding Mode Controller (FSMC). This paper presents the study of stabilization with motion planning of the four rotors mini-flying robot (helicopter with four rotors) through the hybrid FSMC. Simulation results and a comparison with a SMC are presented and discussed. We studied the robustness of the two used controllers in the presence of disturbances. We presented the case of the white noise disturbances. This permits to prove the effectiveness of the proposed control law.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Dynamics systems, Drone, Sliding mode controller, fuzzy control, Hybrid control.
New
Approach for Simultaneously Determination the Optimal Trajectory and
Control of Vibrating String Controlled Systems
by A.
Fakharzadeh J., A. Alampour
Vol. 2. n. 5, pp. 577-583
Abstract - The main attempt of this article is to extend the method that in 1986 Rubio introduced on the base of measure theory for solving optimal control problems for two purposes: it generally would be able to consider the classical solution of the specified systems and moreover, it would be able to illustrate the optimal trajectory and control directly at the same time. In this manner, the solution procedure for a control system governed by a vibrating string equation with the initial and the boundary conditions and an integral criterion is presented. Based on the classical results, the trajectory is considered as a finite trigonometric series with unknown coefficients. Then, the problem is transferred into a variational form and the metamorphosis step is done to convert it into one in which its unknowns are positive Radon measures and some positive coefficients. Next, by extending the underlying space, the existence of the solution is proved and the optimal trajectory and control functions are identified simultaneously as the solution of a finite linear programming problem. A numerical example is also given.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: : Vibrating String, Linear Programming, Radon Measure, Optimal control.
Control-Oriented
Simulation Analysis of a Semi-Batch Reactor
by František
Gazdoš, Lubomír Macků
Vol. 2. n. 5, pp. 584-591
Abstract - The paper presents a control system design oriented analysis of a semi-batch reactor used for tanning waste recovery. The analysis is performed with the help of modelling and simulation means and provides important information for prospective optimal control design of the process. It includes both steady-state and dynamics analyses, general linearization resulting in corresponding transfer functions together with coefficients ranges and behaviour analysis.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Analysis, Chromium Waste, Exothermic Semi-batch Reactor, Modelling, Simulation.
Backstepping-Based
Muti-Criteria Decision Analysis for Greenhouse Control with Real Weather
Data
by
A.Belhani, N. K. M’Sirdi
Vol. 2. n. 5, pp. 592-599
Abstract - In this paper we use the backstepping approach to control climate parameters of greenhouse simulated trough effect of real weather data collected in the south region of Algeria (Biskra) for the period of June 2008.The greenhouse model is a sixth order nonlinear multivariable system. We consider the control of both temperature, relative humidity, CO2 concentration by acting on four control variables such as heating, ventilation, CO2 injection and water injection. To get an optimal controller, we try to solve a multi- objective problem. The multi- objective genetic algorithms based on Non dominated Sorting Genetic Algorithms (NSGA) techniques are used to get a set of optimal controllers. To choose one controller from the above set, we take into account the application of the Multi-Criteria Decision Analysis (MCDA) approach.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Backstepping method, Greenhouse climate model, Lyapounov stability, Multi-Criteria Decision Analysis, Non dominated, Sorting Genetic Algorithms.
Application
of Modern Nonlinear Control to Blood Glucose Regulation : a Comparative
Study of Characteristics of
Sliding Mode Control and Fuzzy Logic Technique
by Omid Shamsara,
Nasser Mehrshad, Asef Zare
Vol. 2. n. 5, pp. 600-608
Abstract - Diabetes is a serious disease during which the body's production and use of insulin is impaired, causing glucose concentration level to increase in the bloodstream. The blood glucose dynamics is described using the Bergman minimal model. In this paper, higher-order sliding mode control techniques, in specific prescribed convergence law, super-twisting control algorithm, is used to robustly stabilize the glucose concentration level of a diabetic patient in presence of the parameter variations and meal disturbance. Intelligent systems have appeared in many technical areas, such as consumer electronics, robotics and industrial control systems. Many of these intelligent systems are based on fuzzy control strategies which describe complex systems mathematical model in terms of linguistic rules. By advent of these methods, new techniques have appeared from which fuzzy logic been applied extensively in medical systems. This paper surveys the utilization of fuzzy logic control. Based on this method, fuzzy logic controller is designed to tackle a control problem of the resulting highly nonlinear plant. It was shown also that the proposed schemes can perform well in simulation experiments. Finally the obtained results from these two methods, are verified based on comparison via digital computer simulation by MATLAB.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Diabetes, Higher-order sliding mode control, Super-twisting control algorithm, Fuzzy logic control.
Trace
Moving Function Description and Autonomous Moving Protocol Evaluation
by H. Vahid
Dastjerdi, M. Tavakoli, M. Delshad, F. Kheiri
Vol. 2. n. 5, pp. 609-613
Abstract - In this paper a heuristic moving function for a mobile to trace a static target in a static or dynamic environment is proposed. The mobile is aware of some changes in environment and some other changes can be estimated. This function can be part of an autonomous moving protocol which has been proposed in previous literature by us. Subsequently we evaluate our moving protocol function by comparing it with random walk. We show that it significantly speeds up the mapping and exploring process.
Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Autonomous Moving, Random Walk, Impulse Ultra Wideband.
