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Energy Conversion, IEEE Transactions on

Issue 4 • Date Dec. 1998

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Displaying Results 1 - 11 of 11
  • 1998 Index IEEE Transactions on Energy Conversion Vol. 13 - Author Index

    Page(s): 379 - 381
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    Freely Available from IEEE
  • Subject index

    Page(s): 381 - 386
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    Freely Available from IEEE
  • Transient performance of series connected three phase slip-ring induction motors

    Page(s): 305 - 310
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    The possibility of operating a three phase slip-ring induction motor as a series connected motor is explored. The merits and drawbacks of this mode of operation are discussed. For this purpose, the necessary mathematical models along with the corresponding computer simulation are developed and experimental verification of the theoretical results is also carried out. It has been found in general that operation of slip-ring induction motors as series connected motors is possible providing that the rotor winding is connected in a sequence opposite to that of the stator winding. This adds flexibility to the modes of operation of these motors. Moreover synchronous operation is also possible, providing that the series connected motor is driven initially at twice its synchronous speed and then connected to the supply View full abstract»

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  • A study on optimal sizing of stand-alone photovoltaic stations

    Page(s): 373 - 378
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    One major application of photovoltaic (PV) power has been in remote areas as isolated small power generation for essential electric power. This paper discusses issues in optimizing the use of such stations and presents a procedure to evaluate different PV schemes considering the stochastic natures of the insolation and the load. The reliability measures in terms of loss of load hours (LOLH), the energy loss and the total cost have been used as the indices for evaluation of different schemes. The insolation and the load demand are modeled as stochastic variables using historical data and experimentation respectively. The operation of various stand-alone schemes are simulated for a specific load. Actual commercially available panel and battery sizes with actual costs have been used in the various configurations studied. The long run expected values of the performance indices for various configurations of the solar station have been measured. Comparative analysis of the results show that higher cost not necessarily translates into better performance. The panel size and the battery size have different impacts on the indices of performance, and a proper balance between the two is necessary to optimize the operation of a stand-alone PV scheme View full abstract»

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  • A PM synchronous servo motor drive with an on-line trained fuzzy neural network controller

    Page(s): 319 - 325
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    A permanent magnet (PM) synchronous servo motor drive with integral-proportional (IP) position controller and a proposed on-line trained fuzzy neural network (FNN) controller is introduced in this paper. First, an IP position controller is designed according to the estimated plant model to match the time-domain command tracking specifications. Then the resulting closed-loop tracking transfer function is used as the reference model, and an adaptive signal generated from the proposed FNN controller, whose membership functions and connective weights are trained on-line according to the model-following error of the states, is added to the control system to preserve a favorable model-following characteristics under various operating conditions View full abstract»

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  • In-situ induction motor efficiency determination using the genetic algorithm

    Page(s): 326 - 333
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    Numerous methods exist for determining the efficiency of induction motors. Many of them require a no-load test, which is not possible for in-situ determination. The evaluation of motor efficiency based on the motor's nameplate or manufacturer's data, on the other hand, in many cases cannot ensure a fair assessment of induction motors employed in the plant. An extensive survey of techniques for efficiency measurement is given. A new method is proposed for in-situ induction motor efficiency determination, based on the genetic algorithm. Results are compared with torque-gauge results View full abstract»

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  • A new graphical approach to three phase two speed induction motor winding design

    Page(s): 334 - 346
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    It has already been shown how to obtain 2-speed winding squirrel-cage induction motors using pole amplitude modulation (PAM) with 6 terminals to the winding. Phase modulation has been used as well to obtain 2-speed winding squirrel cage induction motors with simpler C-terminal change-over switch only. This paper presents a new powerful method (based on the graphical representation of phase distribution) which enables the designer to make his choice easily between PAM and PM. Particular example has been chosen for the presentation together with some experimental results obtained on a trial model View full abstract»

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  • Photovoltaic array driven adjustable speed heat pump and power system scheme for a lunar based habitat

    Page(s): 366 - 372
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    A high reliability power system scheme, incorporating a photovoltaic power supply and adjustable speed heat pump for life support is presented in this paper. Initial design guidelines and also a description of the state of technology available is presented herein. The power supply scheme will be used as input to an adjustable speed drive (ASD) which will drive a heat pump. A brief study of various aspects of ASDs is presented; further a summary of the relative merits of different ASD systems presently in vogue is discussed. The advantages of using microcomputer based ASDs is widely understood and accepted. Of the three most popular drive systems, namely the induction motor drive, switched reluctance motor drive and brushless DC motor drive, any one may be chosen. The choice would depend on the nature of the application and its requirements. The suitability of the above mentioned drive systems and control techniques for photovoltaic array driven ASD for an aerospace application are discussed. Also discussed are several possible power system designs for a potential lunar habitat View full abstract»

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  • On-line current monitoring and application of a finite element method to predict the level of static airgap eccentricity in three-phase induction motors

    Page(s): 347 - 357
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    The introduction reviews the real practical problems of airgap eccentricity in large 3-phase induction motors. On-line monitoring methods for diagnosing airgap eccentricity are also discussed and a state of the art review on the application of current monitoring to detect airgap eccentricity is presented. The limitations of the classical MMF and permeance wave approach for predicting the severity of airgap eccentricity are discussed. The time stepping finite element (FE) method and FFT analysis technique are used as `analyses tools' to predict the frequency components in the current (Hz and dB) as a function of static airgap eccentricity. Excellent agreement is obtained between the measured and predicted frequency components (Hz) in the current spectra which are a function of static eccentricity. The FE method is also used to predict the magnitude (dB) of these frequency components in the current spectrum with different levels of static airgap eccentricity. These predictions are much closer to the measured values in comparison to previous attempts using the classical MMF and permeance wave approach. The contents of this paper will be of particular interest to the manufacturers and industrial users of three-phase induction motors View full abstract»

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  • On-line adaptive artificial neural network based vector control of permanent magnet synchronous motors

    Page(s): 311 - 318
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    This paper presents a novel approach of speed control for a permanent magnet synchronous motor (PMSM) using on-line self tuning artificial neural network (ANN). Based on motor dynamics and nonlinear load characteristics, an ANN speed controller is developed and integrated with the vector control scheme of the PMSM drive. The combined use of off-line and on-line weights and biases adjustments offers a unique feature of on-line system identification and precise speed control of a high performance PMSM drive. The complete drive system is implemented in real time using a digital signal processor controller board-DS1102 on a laboratory 1 HP PMSM. Using the experimental setup, the performances of the proposed drive system are evaluated under various operating conditions. The test results validate the efficacy of the ANN for precise speed control of the PMSM drive. Furthermore, the use of ANN makes the drive system robust, accurate and insensitive to parameter variations View full abstract»

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  • Excitation requirements for stand alone three-phase induction generator

    Page(s): 358 - 365
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    Self excitation in induction machines depends on appropriate combination of speed, load and excitation capacitance. This paper presents direct methods derived from loop and nodal analyses to find different criteria for maintaining self-excitation. Unlike available techniques, the inverse-model for the steady state equivalent circuit has been used. This is found to be of much assistance in the analysis. Besides determination of speed-limits for fixed terminal parameters, and capacitance requirement under varying speed and load, a method to test the possibility of self-excitation for known speed, load and terminal capacitance has also been presented View full abstract»

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Aims & Scope

The IEEE Transactions on Energy Conversion includes in its venue the research, development, design, application, construction, installation, operation, analysis and control of electric power generating and energy storage equipment (along with conventional, cogeneration, nuclear, distributed or renewable sources, central station and grid connection). The scope also includes electromechanical energy conversion, electric machinery, devices, systems and facilities for the safe, reliable, and economic generation and utilization of electrical energy for general industrial, commercial, public, and domestic consumption of electrical energy.

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Meet Our Editors

Editor-in-Chief
Juri Jatskevich
University of British Columbia