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Home>Products>Journal and Reviews>I.RE.A.CO.>Latest issue International Review of Automatic Control (Theory and Applications) - January 2009 - Papers
International Review of Automatic Control - Papers
Vol. 2. n. 1, pp. 1-7
Abstract - This
paper presents a new method to design a dynamic neural controller based
on a noninteger approach and its application to control nonlinear
system. The proposed neuro-CRONE approach is the result of the
combination of CRONE and neural methods. The neural network is Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: CRONE controller, Neural network, Neuro-CRONE controller, Robustness.
by M. Hedayati, S. M. Bashi, N. Mariun, H. Hizam Vol. 2. n. 1, pp. 8-16
Abstract - A review of designing the Optimize Robust FACTS Controller to provide better dynamic performance in power system is presented. The design is carried out applying robustness criteria for stability and performance. Variations of system operation conditions are represented by uncertainty model. Besides, Linear Fractional Transformation (LFT) form together with model reduction techniques are used to design a low order controller which provides fast and stable response under all system conditions. Furthermore, comparison different H∞ robust approaches specify advantages and disadvantages of every method. It is shown that one method has more flexibility and convenience. Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: FACTS, Optimal Robust Control, LQG, Mixed Sensitivity, µ Synthesis, Loop Shaping.
Vol. 2. n. 1, pp. 17-26
Abstract - This paper is concerned with the parametric estimation problem for large-scale systems composed of several interconnected systems, which are described by linear discrete-time state-space mathematical models with unknown parameters. A new recursive parametric estimation algorithm with a particular adaptive gain is proposed for estimating the interconnected system parameters. The stability analysis of the developed parametric estimation scheme is treated by using the Lyapunov method. The proposed recursive parametric estimation algorithm is applied to estimate the parameters of a large-scale systems composed of three interconnected systems. The obtained numerical simulation results show the good performance of this algorithm. Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Large-scale systems, Interconnected systems, Parametric estimation, Recursive parametric estimation algorithm, Discrete-time state-space mathematical models, Stability.
Vol. 2. n. 1, pp. 27-33
Abstract - The
present work focuses on Constrained Nonlinear Generalized Predictive
Control CNGPC for nonlinear dynamic systems based on Artficial Neural
Networks (ANN), Tabu Search (TS) and Genetic Algorithms (GAs). Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Constrained Nonlinear Generalized Predictive Control, Neural Networks, Tabu Search, Genetic Algorithms, Non Convex Optimization.
Vol. 2. n. 1, pp. 34-41
Abstract - In this paper we construct canonical forms for quantum control systems using algebraic transformations. Two types of systems are studied: unperturbed systems and systems with just one external control. The obtained canonical forms are then used to solve the evolution Schrödinger equations of these systems in an analytical way. These results are illustrated with examples. Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Quantum control system, Canonical Form, Evolution equations.
Vol. 2. n. 1, pp. 42-47
Abstract - The paper presents an optimization algorithm to calculate allocation factors of power flows, loads and losses. It analyzes the opportunities applicability of these factors to solve the problems of a posteriori analysis of nodal prices, estimation of generators’ contribution to the network voltage drop, identification of generators, that affect negatively the sensitivity of the steady state equations system solutions’ to a change in the external factors. The optimization method proposed in this paper is intended to aid the Independent System Operator (ISO) working under open access in calculating the necessary ancillary services for system security and reliability. A nonlinear optimization problem is formulated that enables the ISO to make least-cost decisions for purchasing ancillary services. The adequacy of ancillary services is validated by time-domain, midterm stability simulations. The suggested approaches are illustrated on the example of a test power system. Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Power flow analysis, Allocation factors, Nodal prices, Voltage drops, Singular analysis.
Vol. 2. n. 1, pp. 48-59
Abstract - The aim of the present paper is to investigate in details the dynamic performance of the control methods for the variable speed of Doubly Fed Induction Generator DFIG of wind turbine. These includes a traditional regulator PI, a regulator with integral action proportional IP, a Regulator with return gain PIR, a regulator with Internal Model Control IMC and finally a regulator based fuzzy logic control FLC. The performances of the controllers are evaluated under different operating conditions of the power system. The results demonstrate that IMC and FLC are very effective in improving the transient comportment speed and very robust against variable parameters. Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Doubly-fed induction generator, variable speed wind turbine, PI, IP, PIR, IMC, FLC.
Vol. 2. n. 1, pp. 60-68
Abstract - An improved direct torque controlled induction motor drive is reported in this paper. It is established that the conventional direct torque controlled drive has more torque and flux ripples in steady state, which result in poor torque response, acoustic noise and incorrect speed estimations. Hysteresis controllers also make the switching frequency of voltage source inverter a variable quantity. A strategy of variable duty ratio control scheme is proposed to increase switching frequency, and adjust the width of hysteresis bands according to the switching frequency. This technique minimizes torque and current ripples, improves torque response, and reduces switching losses in spite of its simplicity. Simulation results establish the improved performance of the proposed direct torque control method compared to conventional methods. Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Direct Torque Control, Hysteresis controllers, Switching Frequency, Torque Ripple, Induction Motor Drive.
Vol. 2. n. 1, pp. 69-74
Abstract - This paper present a study highlighting performances carried out by the fuzzy regulators, in order to control the speed and the torque of Permanent Magnet Synchronous Motor (PMSM) without salient pole and damping winding. The power is given by a voltage PWM inverter which provides a variable frequency. The mathematical model of the PMSM, permit to define a command strategy based on the vector control associated to the fuzzy logic regulators. The results obtained are compared with those of a PI regulator. Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Vector Control, Decoupling, Directed Flux, PWM Inverter, FUZZY controller, PMSM.
Vol. 2. n. 1, pp. 75-82
Abstract - This paper proposes a solution to unbalance problem of input DC voltages of the five-level neutral point clamped (NPC) inverter. This solution uses clamping bridge, and multilevel PWM current source rectifier (CSR) to control the voltages source inverter (VSI). With the proposed method based fuzzy systems, we can keep the voltage balancing of the dc-link capacitors and provide sinusoidal network currents with nearly unity input power factor. Simulation results involving induction motor drive, verify that the proposed method is suitable for high voltage and large capacity five-level inverters. Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Clamping Bridge, Five-Level NPC Voltages Source Inverter, Fuzzy Systems, Input DC Voltage Stabilization, Induction Motor, PWM Rectifier.
Vol. 2. n. 1, pp. 83-89
Abstract - In this paper we present a wave based control approach for flexible structures using the actuator as a single platform for measurement and control without picking any measurements from the system. Using the reflected wave to the actuator from the system along with the actuator parameters as the current and velocity to estimate the flexible system’s parameters. And using those estimated parameters to achieve robust controllers keeping the system free from any measurements and attached sensors. In this paper all the sensors attached to the system were used just to verify the performance of the controller not to have feed back from the system. Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Mechanical Wave, Torque observer, Position Estimation, Estimation based PID controller.
Vol. 2. n. 1, pp. 90-95
Abstract - A new methodology to design an optimal state feedback controlled to solve problems mainly caused by the presence of nonlinearities in motion control systems. Usually these nonlinearities are isolated, modeled and compensated by various methods. A theoretical background of the proposed generalized method is developed first. The method rely on a local modeling approach applied to give a simpler description of the system dynamics inside a certain set of operating conditions, then a stabilizing state feedback controller is designed based on Linear Matrix Inequalities and applied to robot joint control to enhance tracking performances. Simulations and experimental results are used to verify the efficiency of the proposed method. Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Nonlinearities, Optimal state feedback.
Vol. 2. n. 1, pp. 96-101
Abstract - Investigations in recent years show that uncomfortable agricultural vehicles seat can be a threat for the health of their operators. In fact, the transmitted vibration to the driver, caused by the motion of vehicle and unevenness of the road, is the main source of this problem. In order to reduce these fluctuations, an active cabin suspension based on four ER (Electro-rheological) mounts is presented in this study. ER fluids are a class of smart materials which some of their rheological properties, such as viscosity and shear modulus, changes under the influence of an applied electric field. In order to improve the reliability and efficiency of the suspension system a combination of viscous dampers and ER dampers is also investigated. The results presented herein indicated that a considerable reduction in transmitted vibration can be achieved using proper ER mount and closed loop control system. Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: : ER Fluid, ER damper, Vibration control, Cabin suspension.
Vol. 2. n. 1, pp. 102-107
Abstract - Current interest in small satellites lies in the feasibility of achieving specific but limited objectives, by necessity, small satellites technology requires simple control schemes. In this paper, we present a fuzzy logic controller, as an attempt to replace the classical proportional derivative (PD) controller that is widely used in the spacecraft attitude determination control system (ADCS). The fuzzy logic controller is implemented on the Z axis (yaw) closed loop reaction wheel of a low earth orbit microsatellite with a gravity gradient stabilization. The yaw axis is pointed toward earth. We mention here that, when the spacecraft is not in the imaging mode, it starts spinning along the yaw axis to keep it within thermal limits. So that, in this axis the spacecraft is either in the imaging mode (freeze mode) or barbeque mode (BBQ mode). Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Fuzzy logic, Yaw control, Reaction Wheel.
Vol. 2. n. 1, pp. 108-114
Abstract - This paper summarizes what is known about the instabilities within compression systems as surge precursors in centrifugal compressors and focuses on accessing factors that affect the surge detection and isolation. We study the design of structured observer-based fuzzy fault detection and isolation approach for this class of nonlinear systems with time-varying delayed systems on the basis of Takagi-Sugeno fuzzy model. The proposed method is simulated on a compressor model using an approximation of a real compression system to identify and quantify factors concerning compressor design and operations that effect the detection and the isolation of surge conditions. This paper illustrates an alternative implementation to the compression systems supervision task using the basic principles of model-based fault detection and isolation associated with the self-tuning of surge measurements with subsequent appropriate corrective actions. This work is considered a first step in accessing the factors that affect the success or limitations of surge detection and isolation in natural gas pipeline compressors. Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Compression System, Centrifugal Compressor, Anti Surge Control, Fault Detection and Isolation, Fuzzy Fault Detection and Isolation, Supervisory Control.
Vol. 2. n. 1, pp. 115-120
Abstract - After a presentation of the complexity to apply the fuzzy logic on industrial systems, we present the issues involved in the application of the fuzzy logic particularly the way to approach a control or classification problem. In order to deal with these issues, we present a case study of a grading system of cereals that allows us to determine the price of transactions of cereals (Durum wheat, Soft wheat, Barley, etc.). Our contribution in this work consists in proposing not only an application of the fuzzy logic on the grading system of cereals in Tunisia but also a TQM methodology enabling the transition of the "barème d’agréage" practiced in Tunisia into a grading system based on the concept of "Grade" using the fuzzy logic. Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Fuzzy logic, Control and classification, Quality of cereals, Grading system.
Vol. 2. n. 1, pp. 121-127
Abstract - This paper deals with a control approach for motion coordination of multi-axes system. The drawing of contour with a special part commonly consists of line and arc segments, as well as continuous micro line segments that precisely approach the complicated or irregular portions of that contour. For precise machining of the contour, especially for Cartesian robot with X, Y plan motion, the real-time generation of control motion command for the two axes should be decided according to the characteristics of the contour and the type of driving actuator. The controlled system, used for drawing the contours, consists of an arm link robot having two permanent magnet stepping motors controlled by two fuzzy PID controllers. The simulation results demonstrate that the dynamic performance responses of the stepper motor controlled by the applied PID fuzzy controller is satisfactory and well damped for the problem of drawing a circle profile. Copyright © 2009 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Stepper motor, An arm link robot, Fuzzy PID controller, Motion control.
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