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Industry Applications, IEEE Transactions on

Issue 5 • Date Sept. 1985

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Displaying Results 1 - 25 of 37
  • Table of contents

    Publication Year: 1985 , Page(s): c1 - 1093
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    Freely Available from IEEE
  • IEEE Industry Applications Society

    Publication Year: 1985 , Page(s): c2
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    Freely Available from IEEE
  • Students and the Industry Applications Society

    Publication Year: 1985 , Page(s): 1094 - 1096
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  • The Static Power Converter Committee--- Some Perspectives

    Publication Year: 1985 , Page(s): 1097 - 1098
    Cited by:  Papers (2)
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  • Power Line Considerations for Variable Frequency Drives

    Publication Year: 1985 , Page(s): 1099 - 1105
    Cited by:  Papers (28)
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    More frequent use of variable frequency drives requires that the interaction between the drives and the power line be considered in order to avoid undesirable power line effects caused by the drive. In addition, the power line characteristics need to be defined by the drive manufacturer which assure proper operation of the variable frequency drive. The potential effects the drive has on the power line is discussed, including line harmonics, line notching, and line noise. General approaches for minimizing effects and installation guidelines are also reviewed. View full abstract»

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  • Increased Chlorine Production and Power Efficiency by Incremental Changes--- A Case History

    Publication Year: 1985 , Page(s): 1106 - 1111
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    FMC of Canada Limited built a chlor-alkali plant at Squamish, BC, Canada in 1966. The plant design featured the use of DeNora mercury cells and an outdoor cell room. The plant management has implemented a number of changes over the years which increased production capacity by 25 percent, substantially reduced the emission of pollutants, improved power and energy efficiency, and increased the availability of the plant. Further improvements to plant operation are foreseen. View full abstract»

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  • System Operational Evaluation of Mine Monitoring Systems

    Publication Year: 1985 , Page(s): 1112 - 1116
    Cited by:  Papers (2)
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    In the testing of mine monitoring systems, a software package was developed for the mine monitoring test facility designed at West Virginia University. The software establishes delay times of sensor input to annunciation for single alarms and multiple simultaneous alarms. The alarm measurement techniques for the test fixture are described, as is the software developed to analyze and graph monitoring system response data. Also included is the analysis capability of the facility, the criteria for evaluating mine monitoring systems, and typical test data from a sample system. View full abstract»

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  • Test Criteria and Methodology for Evaluation of Coal Mine Monitoring and Control Systems

    Publication Year: 1985 , Page(s): 1117 - 1120
    Cited by:  Papers (2)
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    Field evaluation of coal mine monitoring and control systems yields data on installation and maintenance, but does not provide a full evaluation of these systems under all possible conditions. Also, the differences in installations and configurations do not allow the performance of different systems to be measured and compared. Under contract of the United States Bureau of Mines (USBM), the West Virginia University (WVU) Department of Electrical Engineering has designed criteria for evaluation of monitoring systems, and a test facility for simulation of mine conditions. This facility provides evaluation of monitoring and control systems under both normal and abnormal conditions. This paper describes the test criteria chosen, the design of the test facility, and the experiences of tests performed on mine monitoring systems to date. View full abstract»

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  • Evaluation of Computer-Based Mine Monitoring and Control at Barnes and Tucker Mine 20

    Publication Year: 1985 , Page(s): 1121 - 1126
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    A program is being conducted to demonstrate the use of centralized computer control of all conveyors from face to preparation plant. The system incorporates the National Coal Board's MINOS supplied by Hawker Siddeley Dynamics Engineering and a telephone/pager system supplied by Mine Safety Appliances. This paper summarizes results to date of the demonstration which will provide documentation of installation requirements, operating experience, and impact of the system on mine operations; and will provide information to evaluate the system's capabilities and its potential as a management tool. Sponsored initially by the Department of Energy and later turned over to the Bureau of Mines, the program, scheduled to continue for another two years, also involves Barnes and Tucker Coal Company, the Bituminous Coal Research (BCR) National Laboratory, and the coal industry through the BCR Mine Monitoring and Communications Committee. View full abstract»

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  • Improvements in Fault Current Calculation Techniques for DC Systems

    Publication Year: 1985 , Page(s): 1127 - 1135
    Cited by:  Papers (1)
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    Since 1970 at least 12 men have died from underground coal-mine fires which were started due to undetected high-resistance faults on trolley systems. Methods which have been proposed to determine these dc fault currents more accurately involve the assumption that the magnitude of the fundamental-component current on the ac side of the rectifier is equal to the magnitude of the current on the dc side of the rectifier. Since this assumption breaks down when the fault occurs at the terminals of a rectifier, a new nonlinear equation set is proposed which eliminates this assumption. The equation set is formulated to account for dc fault current contributions from dc machines and three-phase bridge rectifiers. Newton's method is used to solve the set of nonlinear equations. The use of rectangular form for all voltage variables and elimination of current as a variable provides more reliable and faster convergence than previous methods. A new phenomenon is identified in the results presented. Under certain fault conditions, dc motor voltages may be of sufficient magnitude to reverse bias electrically close bridge rectifiers and hence prevent them from contributing to the fault current. View full abstract»

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  • Converter Volt-Ampere Requirements of the Switched Reluctance Motor Drive

    Publication Year: 1985 , Page(s): 1136 - 1144
    Cited by:  Papers (87)  |  Patents (2)
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    An algebraic nonlinear analysis of the switched reluctance drive system is described. The analysis is intended to provide an understanding of the factors that determine the kVA requirements of the electronic power converter and to determine the fundamental nature of the torque/speed characteristics. The effect of saturation is given special attention. It is shown that saturation has the two main effects of increasing the motor size required for a given torque, and at the same time decreasing the kVA per horsepower (i.e., increasing the effective power factor by analogy with an ac machine). The kVA per horsepower is lower than predicted by simple linear analysis that neglects saturation. Necessary conditions are also developed for a flat-topped current waveform by correctly determining the motor back-EMF. The reason why it is desirable to allow the phase current to continue (though with much reduced magnitude) even after the poles have passed the aligned position is explained. The theory provides a formula for determining the required commutation angle for the phase current. The basis is provided for an estimation of the kVA requirements of the switched reluctance (SR) drive. These requirements have been measured and also calculated by a computer simulation program. View full abstract»

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  • Control System Design of a Current Inverter Induction Motor Drive

    Publication Year: 1985 , Page(s): 1145 - 1153
    Cited by:  Papers (11)
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    An analytical design is presented of the control system of a slip-controlled current inverter induction motor drive. First of all, the drive dynamics are modeled in a control-oriented perspective. Afterwards, the transfer function between the rectifier output voltage and the inverter current is thoroughly analyzed and the results used to design the current controller. Two function generators are then synthetized and incorporated in the speed loop so as to obtain constant rotor flux operation and satisfactory torque dynamics. Lastly, the speed controller is designed for a fast and accurate response. All the parameters of the control system are given in terms of performance specifications and drive data. A computer implementation of the drive system is carried out and performance tests are shown. View full abstract»

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  • Microprocessor-Based Adaptive Speed and Position Control for Electrical Drives

    Publication Year: 1985 , Page(s): 1154 - 1161
    Cited by:  Papers (40)
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    Microprocessor-based adaptive speed and position control of an electrical drive with variable load parameters is investigated. The on-line identification is carried out with the help of the recursive least squares algorithm, and a pole-assignment procedure provides a direct way of updating the parameters of the controllers. Time-optimal and quasi-time-optimal adaptive position control is presented. The proposed control scheme was implemented on a microprocessor system and was applied to control a 40-kW converter-fed dc drive. Experimental results are presented. View full abstract»

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  • Model-Control PROMC---A New Control Strategy with Microcomputer for Drive Applications

    Publication Year: 1985 , Page(s): 1162 - 1167
    Cited by:  Papers (5)
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    The new control strategy "model control" PROMC will be presented. The model control strategy can be used favorably in systems with switching amplifiers such as converters and inverters. The principle idea is to find an electrical model which is supplied with voltage or current sections from the switching amplifier. By this model it is possible to precalculate the desired signals for the next switching state. The precalculated signals are compared with the real signals of the existing switching state. With this procedure the optimal switching moment is determined. The advantages of this strategy are shortest response time possible, no overshoot, no sensitivity against saturation, and no influence of continuous or discontinuous current. Therefore, the strategy features "precalculation of a reference signal for optimal model control" (PROMC). View full abstract»

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  • Design of an Input Filter for the Six-Pulse Bridge Rectifier

    Publication Year: 1985 , Page(s): 1168 - 1175
    Cited by:  Papers (7)
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    The design of an input filter for the six-pulse bridge rectifier is discussed. For industrial applications of mid-range power, two types of input filter are examined. It is shown that these filters with minimum number of components can meet most operational requirements if designed properly. The variation of performance factors with filter type and parameters are discussed. As the ultimate decision in selecting the filter components depends on the type of application, the design guidelines are described. The materials for custom designing of the filter are included. The features and advantages of each type of filter are outlined. For comparison purposes, several design examples are also included. View full abstract»

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  • A Fast DC Current Breaker

    Publication Year: 1985 , Page(s): 1176 - 1181
    Cited by:  Papers (1)
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    A fast dc current breaker circuit is presented and analyzed. Relevant design and control parameters are also derived. Furthermore, logic control implementation and power circuit component protection are discussed. It is shown that a simple control strategy is best suited for static loads at predefined load current levels. Also theoretical results are compared with experimental results. View full abstract»

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  • Microcomputer Control of a Residential Photovoltaic Power Conditioning System

    Publication Year: 1985 , Page(s): 1182 - 1191
    Cited by:  Papers (132)
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    Microcomputer-based control of a residential photovoltaic power conditioning system is described. The microcomputer is responsible for array current feedback control, maximum power tracking control, array safe zone steering control, phase-locked reference wave synthesis, sequencing control, and some diagnostics. The control functions are implemented using Intel 8751 single-chip microcomputer-based hardware and software. The controller has been tested in the laboratory with the prototype power conditioner and shows excellent performance. View full abstract»

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  • A New Current Source GTO Inverter with Sinusoidal Output Voltage and Current

    Publication Year: 1985 , Page(s): 1192 - 1198
    Cited by:  Papers (59)  |  Patents (1)
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    A new current source inverter with sinusoidal output voltage and current is presented. Gate turn-off thyristors (GTO's) and pulsewidth modulation (PWM) control techniques are used in the current source inverter to produce the sinusoidal output voltage and current. Three capacitors are connected to the ac output terminals to absorb overvoltages which occur when the GTO current is cut off and to provide a filter function for reducing harmonics in the output current. Voltage spikes, which have been a serious problem in the practical application of this inverter, are suppressed by adding gate pulses which force the inverter into a state of shoot-through. Moreover, this inverter permits the capacitance of an ac output terminal capacitor for absorbing overvoltages to be reduced to one-tenth or less of that of a commutating capacitor in a conventional thyristor type current source inverter. A 3.7-kW induction motor is driven by the inverter. The motor efficiency and noise level are measured and compared with those obtained when the motor is driven by a conventional voltage source PWM inverter. An operating efficiency five or six percent higher and noise level 10 dB lower are obtained for the former. Therefore, this current source GTO inverter is very suitable for ac motor variable speed drives. View full abstract»

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  • Optimum PWM Waveform Synthesis---A Filtering Approach

    Publication Year: 1985 , Page(s): 1199 - 1205
    Cited by:  Papers (6)
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    A fundamentally different approach is proposed for the synthesis of optimum pulsewidth modulated (PWM) waveforms for high-power inverter applications. Conventional optimum PWM waveform synthesis techniques which seek to control harmonic levels in the inverter output directly are seen to be equivalent to a filtering operation. Digital filter structures capable of processing PWM waveforms are examined and waveform synthesis strategies are proposed and verified experimentally. Finally, the design of a high-performance PWM waveform generator is detailed. View full abstract»

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  • PWM Control Techniques for Rectifier Filter Minimization

    Publication Year: 1985 , Page(s): 1206 - 1214
    Cited by:  Papers (56)  |  Patents (1)
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    Minimization of input/output filters is an essential step towards manufacturing compact low-cost static power supplies. Three PWM control techniques that yield substantial filter size reduction for three-phase (self-commutated) rectifiers are presented and analyzed. Filters required by typical line-commutated rectifiers are used as the basis for comparison. Moreover, it is shown that in addition to filter minimization two of the proposed three control techniques improve substantially the rectifier total input power factor. View full abstract»

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  • Optimum System Design of a Three-Phase Rectifier-Inverter Type of Frequency Changer

    Publication Year: 1985 , Page(s): 1215 - 1225
    Cited by:  Papers (18)
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    Steadily decreasing prices and improved performance of semiconductor devices have raised expectations towards the development and large-scale application of motor-mounted static converters. In view of this, the design of a rectifier-inverter type of frequency changer which requires very small reactive components is considered. Accordingly, rectifier and inverter PWM schemes which generate the minimum possible harmonic distortion are first discussed. By using a suitable analysis method, ``optimum'' design data are obtained for every major system component. Resulting reactive component values are shown to be considerably smaller than the ones required by typical rectifier-inverter structures. Predicted key results are verified by computer simulation. View full abstract»

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  • A Novel Bilateral Power Conversion Scheme for Variable Frequency Static Power Supplies

    Publication Year: 1985 , Page(s): 1226 - 1233
    Cited by:  Papers (33)
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    PWM voltage source inverters (VSI's) supplied from diode rectifiers are employed with most of today's static power supplies for variable frequency ac type loads. This method generates nonsinusoidal input and output voltage/current waveforms and yields poor system reliability. An upgraded method of power conversion is presented that eliminates both problems. In addition, it allows bidirectional power flow which improves efficiency and simplifies cooling requirements. The subject method requires a PWM rectifier and a PWM current source inverter. Advanced PWM techniques employed with both static Converters allow the minimization of all associated passive components. View full abstract»

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  • A Computer-Aided Analysis and Design Approach for Static Voltage Source Inverters

    Publication Year: 1985 , Page(s): 1234 - 1241
    Cited by:  Papers (39)
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    The relative success of the ``cut and try'' method has made the design of static power converters more of an art than a science. As a result, no comprehensive analysis approach is available today that can be used to design static converters with a good degree of confidence. Some important aspects of this problem-concerning mainly static voltage source inverters-are treated in this paper within the framework of a generalized analysis and design method. The subject approach utilizes the switching function concept to derive relevant analytical expressions, and digital simulation to obtain relevant design data. View full abstract»

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  • Some Improved Forced Commutated Cycloconverter Structures

    Publication Year: 1985 , Page(s): 1242 - 1253
    Cited by:  Papers (53)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4187 KB)  

    Full automation in manufacturing processes has generated a considerable demand for ac motor drives and in particular static frequency changers (FC's). Forced commutated cycloconverters (FCC's) are frequency changers that can provide a wide output frequency range with minimum energy storage requirements. For this reason they can be manufactured in integrated form with significant savings in price, weight, and volume. These factors have generated considerable research activity toward the development of FCC structures that can compete with the typical rectifier-inverter structures. Some advanced FC cycloconverter structures with improved performance characteristics are considered. Areas of improvement include voltage utilization and generated harmonic distortion. View full abstract»

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  • Heat Pump Water Heater Control

    Publication Year: 1985 , Page(s): 1254 - 1256
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    A control system is described for a heat pump water heater which uses the thermostat on an existing electric water heater to determine the need for water heating. The control system allows an installer to wire in an electric water heater with the heat pump using the same connections for supplying power to the water heater which would normally be used. This control system will also automatically turn off the heat pump when frost forms on the evaporator coil and will allow the electric elements in the tank to heat the water. The system is easy to install, provides reliable operation of a heat pump, does not create any unusual safety problems, and gives uninterrupted hot water service. View full abstract»

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Aims & Scope

The scope of the IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS includes all scope items of the IEEE Industry Applications Society, that is, the advancement of the theory and practice of electrical and electronic engineering in the development, design, manufacture, and application of electrical systems, apparatus, devices, and controls to the processes and equipment of industry and commerce; the promotion of safe, reliable, and economic installations; industry leadership in energy conservation and environmental, health, and safety issues; the creation of voluntary engineering standards and recommended practices; and the professional development of its membership.

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