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International Review of Electrical Engineering - June 2006 - Papers

 

   

 

 

 

International Review of Electrical Engineering - Papers

 

go to top    Electromagnetic Coupling - EMC of Electrical Systems (Part I)
        by I. Kováčová, D. Kováč

         Vol. 1. n. 2, pp. 234-240

 

Abstract - The paper deals with the general analysis of one part of the electromagnetic compatibility (EMC) problem - the electromagnetic coupling applied in the field of power electrical systems. Theoretical analysis of above mentioned problem, based on the impact investigation of the electromagnetic wave propagation, is described in part I. Obtained results can be used for predictive stating of EMC quality of individual new electrotechnical products.

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Keywords: Electrical electromagnetic compatibility, Electromagnetic coupling, Electrical systems, Electrical drives.

 

 

go to top    Highly-Parallel Silicon Optical Receiver

        by R. Swoboda, K. Schneider, H. Zimmermann

         Vol. 1. n. 2, pp. 241-246

 

Abstract - The need of high performance optical receivers is no longer contradictory to low-cost silicon optical receiver chips. The optoelectronic integrated circuits (OEICs) presented in this paper are produced in a 0.5 µm BiCMOS technology and therefore suitable for the detection of visible and near-infrared light. The low-cost process offers a cheap alternative solution to much more expensive III-V photodetectors on the wide market of short-distance applications, for example local-area networks, fiber in the home, and optical interconnects on boards as well as between boards. A highly parallel receiver array with 36 parallel channels on one Si-chip with a data rate of 3 Gb/s/channel, which leads to an overall data rate of 108 Gb/s is presented here. In addition low power consumption of 22 mW per channel inclusive output driver is achieved.

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Keywords: OEICs, optical receiver, receiver array, monolithic integrated photodiodes, BiCMOS process.

 

 

go to top    Effects of Parameter Variations on Low-Power SRAM Decoder
        by X. Chen, D. Velenis

         Vol. 1. n. 2, pp. 247-253

 

Abstract - The effects of environmental and manufacturing process variations on a half-swing pulse-mode low-power SRAM decoder are demonstrated in this paper. The sensitivity of the propagation delay to parameter variations is determined for both a 256×8b low-power SRAM circuit with a self-resetting pulse-mode half-swing decoder and a 256×8b general purpose SRAM circuit. The effects of variations in the power supply voltage, temperature, and gate oxide thickness are considered for both SRAM implementations.

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Keywords: Parameter Variations, Self-resetting Pulse-mode Half-swing Decoder, SRAM Decoder.

 

 

go to top    Optimal Design of a New Type of Magnetic Fluid Electro-Pneumatic Device
        by R. Olaru, C. Petrescu

         Vol. 1. n. 2, pp. 254-259

 

Abstract - The paper presents a study performed in order to determine the optimum geometry and material properties of an electro-pneumatic device based on magnetic fluids (M F). The magnetic field inside the device is analyzed using the finite element method and the overall force is calculated using Maxwell's magnetic tensor and performing a numerical cuadrature. The results outline the dimensions and magnetic constants of the materials involved that render a maximum overall force transmitted by the proposed actuator.

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Keywords: Magnetic fluids, electro-pneumatic converter, numerical analysis of magnetic fields, optimization.

 

 

go to top    Design and Implementation of a Self-Tuning Adaptive Controller for Induction Motor Drives

        by D. Boukhetala, K. Halbaoui, F. Boudjema

         Vol. 1. n. 2, pp. 260-269

 

Abstract - The paper deals with an indirect self-tuning speed control for an induction motor supplied by inverter system. Input/Output models are identified with the recursive least squares algorithm and the controller adaptation is based on a minimum variance control (MVC) law. Emphasis is put on the evaluation of the parameter identification in order to avoid instabilities because of disturbances or insufficient excitations. This is especially of importance when the adaptive control is carried out in closed loop systems and without additional test signals. Experimental results show the improvement of the dynamic responses and the robustness against load variations or parameters variations.

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Keywords: Induction motor drives, High Performance Control, Parameter estimation, Adaptive control.

 

 

go to top    Simplified Fuzzy Model of an Induction Motor

        by P. Macko, P. Fedor, D. Perduková

         Vol. 1. n. 2, pp. 270-276

 

Abstract - A three-phase induction motor represents – even after acceptance of some simplifying presumptions – a complex non-linear system with several inputs. Modern artificial intelligence methods (fuzzy approach, neural networks) enable the finding of its substantially more simple and practically applicable models based on the description of its significant qualitative properties. The paper deals with the setup of a simplified fuzzy model of an induction motor using fuzzy prediction of critical parameters of the Kloss formula. For the setup of this model it is necessary to carry out several standard measurements of step responses on the motor, and no prior knowledge of the motor parameters is required. The resulting simple model can be used in superior control circuits for determining the internal torque of the motor, and also for the identification of its actual parameters, e.g. of the rotor resistance from the actual dynamic responses of the drive.

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Keywords: Fuzzy identification, induction motor model.

 

 

go to top    On the Use of Neural Networks in Recognizing Sources of Partial Discharges in Electrical Machine Insulation: A Short Review

        by M. G. Danikas, A. D. Karlis

       Vol. 1. n. 2, pp. 277-285

 

Abstract - The purpose of this paper is to review the role of the Neural Networks (NN) and their use regarding the classification and identification of partial discharges (PD) in electrical machine insulation. Various techniques are discussed and the problems one has to confront are mentioned. It is remarked that NN may offer a valuable tool for recognition and classification of defects in the said insulation although problems remain regarding the cases of multiple defects.

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Keywords: Partial discharges, rotating machine insulation, Neural Networks.

 

 

go to top    Robust Speed Control of PMSM using Predictive Generalised and Sliding Mode Control System Based on Reference Model

        by S. Hassaine, S. Moreau, C. Ogab, B. Mazari

       Vol. 1. n. 2, pp. 286-294

 

Abstract - In this paper a Generalized Predictive Control associated with a Sliding Mode Control (GPSMC) based on Reference Model Control (RMC) is proposed for PMSM system. The controller employs a sliding mode control (SMC) strategy applied to the direct stator current and to the motor electromagnetic torque. It allows a strong current (torque) dynamics and on predictive speed control strategy for the speed regulation. Thanks to the proposed control scheme, the response of the PMSM system will strictly follow the reference model and will be insensitive to system uncertainties and load disturbance. This kind of controller achieves good performances in simulations.

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Keywords: Predictive Control, Sliding Mode Control, Reference Model Control, PMSM.

 

 

go to top    Fixed Switching Frequency Current Sensorless Solid State Voltage Regulator for Autonomous Induction Generators
        by A. Kuperman, R. Rabinovici

        Vol. 1. n. 2, pp. 295-303

 

Abstract - A voltage regulator based on a theory of reactive power transmission between two voltage sources, connected through an inductance, is used. The solid-state regulator is acting like a variable capacitor/inductor, eliminating the fixed capacitor limitations present in classic fixed capacitor- based topologies. The control scheme is simple and straightforward, employing a reactive element-emulating circuit with time delay compensation, reported by authors in an earlier paper. Two possible configurations, with or without auxiliary fixed capacitors are explained to have influence on the inverter size and rating. Such generator-converter unit can be used in a remote area to feed frequency insensitive loads, automotive power generation systems or, possibly, in wind energy conversion systems, providing a stable DC link to grid interfacing inverter through an uncontrolled rectifier.

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Keywords: Induction generators, shunt connected inverter, voltage control.

 

 

go to top    A Direct Adaptive Control of Permanent Magnet Synchronous Motor
        by A. Nait Seghir, M. S. Boucherit

        Vol. 1. n. 2, pp. 304-310

 

Abstract - In this paper, the design and the application of a direct adaptive control based on weighted minimum prediction error (WMPE) control strategy of Permanent Magnet synchronous Motors (PMSM) are presented. The traditional Proportional-Integral (PI) controller is largely used in industry because of the robustness that procures this regulator. When the dynamics of the system vary over time or with operating conditions, the PI controller became not available. The WMPE control strategy combined with a recursive least square algorithm gives an adaptive controller for a drive speed seems to be a promising solution to achieve the required performance. In this study we apply adaptive regulator in place of PI controller of the field-oriented control scheme of the PMSM. The simulation results obtained show the efficiency of the proposed controller to ensure robustness against load and parameters variations and to achieve the required performances.

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Keywords: Direct adaptive control, Field-oriented control, Permanent Magnet synchronous Motors, Weighted minimum prediction error strategy.

 

 

go to top    A New Modeling and Control of a Five Level Three-Phase Diode Clamped Inverter with Self-Stabilization of the DC Link Voltage
        by O. Bouhali, B. Francois, E. M. Berkouk, C. Saudemont

  Vol. 1. n. 2, pp. 311-322

 

Abstract - In this paper, the direct modulation strategy of a three-level inverter with self stabilization of the DC link voltage is extended to a five-level inverter. Therefore, a new modeling and control strategy of a five-level three-phase Diode Clamped Inverter (DCI) is presented. The obtained modeling shows that modulated multilevel voltages are obtained by combination of eight different three-level functions, which are called modulation functions. Therefore, a space vector scheme without using a Park transform is explained. Based on this algorithm, the location of the reference voltage vector can be easily determined. Then, the voltage vectors are selected to generate corresponding levels and simultaneously their durations are calculated. More over, the redundancies of different switch configurations for the generation of intermediate voltages are used to limit the deviation of capacitor voltages. Simulation results for a five-level three-phase Diode Clamped Inverter are presented to show the good performance of the proposed balancing modulation.

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Keywords: Direct modulation, Multi-level converters, Balancing modulation, Space vector.

 

 
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