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Power Electronics, Drives and Energy Systems for Industrial Growth, 1996., Proceedings of the 1996 International Conference on

Date 8-11 Jan. 1996

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  • AN ADVANCED ELECTRONIC LOAD GOVERNOR FOR CONTROL OF MICRO HYDROELECTRIC GENERATION

    Publication Year: 1996 , Page(s): 997 - 1001
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  • Author's index

    Publication Year: 1996
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    Freely Available from IEEE
  • PROCEEDINGS OF THE 1996 INTERNATIONAL CONFERENCE ON POWER ELECTRONICS, DRIVES AND ENERGY SYSTEMS FOR INDUSTRIAL GROWTH

    Publication Year: 1996
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  • Design aspects of upgradation from 6 pulse to 12 pulse operation of NHVDC project

    Publication Year: 1996 , Page(s): 1065 - 1071 vol.2
    Cited by:  Papers (1)
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    In India, the first HVDC project was a back to back link between the Northern grid and the Western grid at Vindhyachal. This project was commissioned by an external agency. The Government of India approved a proposal for an experimental HVDC line project to give Indian planners, manufacturers and utilities an opportunity to absorb the technology. This project was to be designed and commissioned with cooperation of a number of Indian agencies. Stage-I of this National HVDC (NHVDC) project was successfully commissioned in October 1990, and has since been operating quite satisfactorily. In continuation of that effort, the Government of India has since approved stage-II of the NHVDC project. In stage-II the focus is on modernisation and project engineering. The major change in stage-II are the modernisation of the controls. Upgrade details and the care being taken to have minimum disturbance to the existing setup, is discussed in this paper. The operational requirements, system solutions and control system aspects which have been considered and are being implemented for this project are also covered View full abstract»

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  • Knowledge-based pulse width modulated embedded control and on-line condition monitoring of A.C. drives

    Publication Year: 1996 , Page(s): 850 - 856 vol.2
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    There is no universally accepted control strategy or PWM generation method which could be used in the entire range of complex AC motor drive control applications. To attempt a solution for this problem, a novel general purpose knowledge-based control system is investigated. An investigation, using this concept, to provide clear regions in the spectrum of a PWM waveform in order to allow unhindered examination of signature components used in online condition monitoring diagnostics is presented. The development of hardware using Intel 8097 microcontrollers in a master-slave configuration and software modules adapting real-time concurrent programming techniques based on knowledge-based concepts is also presented View full abstract»

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  • Analysis of series compensated self excited induction generators for autonomous power generation

    Publication Year: 1996 , Page(s): 687 - 693 vol.2
    Cited by:  Papers (4)
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    The paper presents an analytical technique to predict the steady state performance of a 3-phase self excited induction generator for autonomous power generation which employs both shunt and series capacitors for voltage regulation. The system is modeled using an equivalent circuit which interconnects the machine, capacitor and the load. Simplifying appropriate loop equations of the circuit leads to two nonlinear equations in the unknown quantities namely the saturated magnetizing reactance and the generated per unit frequency for the given machine parameters, speed, capacitors and load. A numerical method based on the Newton-Raphson technique is developed to solve these equations to predict the performance. The validity of the method is evaluated by computing predicted and experimental results on a laboratory machine. Performance results under different operating conditions are detailed, to study the effect of series compensation in practical realization of such systems View full abstract»

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  • Study of defuzzification methods of fuzzy logic controller for speed control of a DC motor

    Publication Year: 1996 , Page(s): 782 - 787 vol.2
    Cited by:  Papers (3)
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    A typical fuzzy logic controller (FLC) has the following components: fuzzification; knowledge base; decision making; and defuzzification. Various defuzzification techniques have been proposed in the literature. The efficacy of a FLC depends very much on the defuzzification process. This is so because the overall performance of the system under control is determined by the controlling signal (the defuzzified output of the FLC) the system receives. The aim of this paper is to evaluate, qualitatively, the performance of the different defuzzification techniques as applied to speed control of a DC motor View full abstract»

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  • Transient thermal analysis of induction motors

    Publication Year: 1996 , Page(s): 932 - 939 vol.2
    Cited by:  Papers (2)
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    Induction machine transient thermal analysis has been a subject of interest for machine designers in their effort to improve machine reliability and in rotor design optimisation. The study of transient thermal behavior is useful to identify causes of failure in induction machines. This paper presents a two dimensional transient analysis of induction machines using the available heat transfer coefficients in literature. A generalised finite element code developed with Galerkin's weighted residual technique is used for analysis. The model is applied to one squirrel cage TEFC machine of 3.7 kW and another surface cooled machine of 5.7 kW. The predicted temperatures compare well with test results. The advantages and limitations of this model are discussed View full abstract»

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  • Evolution of control techniques for industrial drives

    Publication Year: 1996 , Page(s): 869 - 875 vol.2
    Cited by:  Papers (3)
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    The control system of any variable speed electric drive consists mainly of an outer loop for controlling the mechanical output of the drive, (e.g., torque, speed or position) which generates commands to the inner loop, that controls the electromagnetic states of the electric machine (e.g., voltages, currents and magnetic flux) to produce the desired response. The configuration of the inner loop controller depends on the type of the electric motor and the topology of the power converter being used which in turn are dependent on the requirements of the application. DC variable speed drives were the industrial work horses until the 1960s due to the simplicity of their control. Since the late 1960s, advances in semiconductor technology for power as well as control applications, enabled AC variable speed drives to compete with DC drives in various industrial applications. Most present day research and development efforts are aimed at providing higher performance and more reliable AC drives at a lower cost than those of comparable DC drives. This paper provides an overview of the classical and modern control techniques for both DC and AC drives along with their applications View full abstract»

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  • PC based data acquisition system for measurement of switched reluctance motor (SRM)

    Publication Year: 1996 , Page(s): 957 - 963 vol.2
    Cited by:  Papers (3)
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    The paper proposes a PC-based scheme for the measurement of the inductance profile of a switched reluctance motor (SRM) under conditions closer to normal operation. Different methods for inductance measurement appropriate to SRMs are briefly described. Specifications of the data acquisition system (DAS) for PC-based measurement systems for SRMs are derived by considering the operational features and instrumentation requirements of SRMs in order to develop an appropriate DAS. Implementation of an offline system for the measurement of inductance of SRMs based on the proposed scheme is explained. Finally, results of tests conducted on a 7.5 kW SRM are presented in support of the proposed scheme View full abstract»

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  • State feedback using artificial neural network for speed control of DC motor

    Publication Year: 1996 , Page(s): 753 - 756 vol.2
    Cited by:  Papers (1)
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    This paper introduces the idea of using artificial neural networks for the speed control of a DC motor whose parameters are not constant. Motor armature current and speed are taken as state variables. The control is achieved through state feedback and output controllers whose parameters are adjusted by the neural network by observing current and speed history. The scheme is illustrated by its application to a particular DC motor. The responses of conventional controllers and those obtained with the proposed scheme are compared View full abstract»

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  • Design and experimental investigation of high speed squirrel cage induction motor

    Publication Year: 1996 , Page(s): 920 - 926 vol.2
    Cited by:  Papers (4)
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    In this paper the experimental investigation of high speed squirrel cage induction motor (750 Hz, 2 pole) has been presented. Measurement of the equivalent circuit parameters has been discussed in detail. For no-load, stand still test was used instead of light running test. A numerical technique was used for the computation of bridge leakage reactance of the closed rotor slot for various values of rotor bar current. The computed values were compared with the measured one. For evaluation of performance of the motor, equivalent circuit approach was adopted taking into account the nonlinearity of various parameters. Stress distribution in the rotor lamination was also computed using the finite element method for various rotor slot-bridge heights View full abstract»

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  • Evaluation of the input current quality by three different modulation strategies for SVM controlled matrix converters with input voltage unbalance

    Publication Year: 1996 , Page(s): 794 - 800 vol.2
    Cited by:  Papers (18)  |  Patents (5)
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    A new input current modulation strategy for a matrix power converter is presented. The performance of the new strategy during input voltage unbalance is compared to two other strategies. The difference of the three modulations only concerns the detection of the reference angle for the input current vector. The input current quality is evaluated using four different criteria. It is concluded that depending upon the modulation strategy, the distortion of the input current may appear either as a series of positive sequence harmonics or a negative sequence fundamental component or a positive and a negative series of harmonic components with reduced amplitudes. Good accordance is found between the analytical solutions and numerical simulations View full abstract»

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  • Compact and efficient transformerless power conversion system

    Publication Year: 1996 , Page(s): 649 - 655 vol.2
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    The power conversion system (PCS) developed by the author is a new technology that efficiently transforms power between AC and DC. The conversion process permits the input voltage level to be stepped up or down without the use of magnetic core transformers. The transformation is accomplished using solid state switching devices, capacitors, air-core inductors and an intelligent control system. The technology is based on the property of resonance charging, thereby permitting the use of self commutating switches. The current through the switches, being sinusoidal in nature, has a low dI/dt. This permits the use of slower, less expensive thyristors, similar to those used in high voltage phase control applications. Using these components, a highly efficient inverter can be constructed for a variety of large utility applications View full abstract»

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  • AC operated EOT crane control with variable voltage variable frequency drive

    Publication Year: 1996 , Page(s): 857 - 861 vol.2
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    Conventional AC operated electric overhead travelling (EOT) cranes uses slip ring induction motors whose rotor windings are connected to a power resistance. Speed control is performed by changing the rotor resistance in 3 to 4 steps by power contactors. Reversing is performed by changing the phase sequence of the stator supply through line contactors. Braking is achieved by a plugging operation. A crane control system has been developed using a variable voltage variable frequency drive and a programmable controller which has the advantage of continuous speed control; reversing is achieved by changing the phase sequence through an inverter. The main advantages of thi system are precise positioning, energy saving and increased motor life. This paper focuses on the application of variable voltage variable frequency induction motor drives in crane applications View full abstract»

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  • A controlled stand-alone single-phase induction generator

    Publication Year: 1996 , Page(s): 694 - 699 vol.2
    Cited by:  Papers (1)
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    This paper sets forth the steady-state and dynamic performance characteristics of a novel stand-alone, single-phase induction generator scheme in which the load voltage and frequency are regulated using a full-bridge pulse-width modulation (PWM) DC/AC inverter. A battery feeding the PWM inverter supplies (receives) power to (from) the generator when load demand is greater (lesser) than the power supplied from the prime mover which could be diesel engine, wind or hydro View full abstract»

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  • On-line insulation monitoring of heavy duty coal face electrical drives using zero sequence current harmonics

    Publication Year: 1996 , Page(s): 940 - 943 vol.2
    Cited by:  Papers (4)
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    One of the major drawbacks of a restricted-neutral system of electrical power supply used in underground coal mines of many countries is the lack of on-line insulation monitoring facility and early warning capability during deterioration of system insulation level. The paper outlines a novel technique of noninvasive on-line insulation monitoring for a restricted neutral system of power supply using harmonics content of zero sequence current reflected in the secondary winding of a core balance transformer View full abstract»

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  • Design analysis of permanent magnet DC motors with differing armature, magnet and yoke lengths

    Publication Year: 1996 , Page(s): 907 - 912 vol.2
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    A modified magnetic circuit method and a 2-D finite element procedure are presented for the analysis of DC permanent magnet motors with a differing armature, magnet and yoke lengths including nonlinear material behaviour of steel and permanent magnet. A 12 volt, 120 watts motor is analyzed through these methods and compared with experimental results of a prototype sample. In the case of finite element analysis, commutation effects and short chording of armature winding are treated appropriately, and cogging torque and voltage ripple are predicted View full abstract»

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  • A neuro-PID speed controller for DC drives

    Publication Year: 1996 , Page(s): 757 - 763 vol.2
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    In this paper, a hybrid controller, consisting of a conventional proportional-integral-derivative (PID) controller and a neurocontroller, is proposed. This controller combines the learning capabilities of artificial neural network-based controllers and the global asymptotic stability of conventional PID controllers to control a DC motor. This kind of controller provides better control of nonlinear plant which otherwise would have been difficult to control without the proper tuning of PID gains. Simulation results are presented for the speed control of a DC motor View full abstract»

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  • Elimination of inrush current of transformers and distribution lines

    Publication Year: 1996 , Page(s): 976 - 980 vol.2
    Cited by:  Papers (4)
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    Repeated switching of distribution transformers take place due to poor generation and load shedding. The transformers mounted on electric locomotives are also regularly reswitched after crossing each buffer zone between two substations. The steady state magnetizing current of a transformer is about 5% of the full load current, but the transient inrush current may be as high as ten times the full-load current. The switching instant decides the nature and magnitude of the switching current and it is used here to control the inrush current. Another method is adopted by placing a capacitor at the secondary side of the unloaded transformer connected at the sending or receiving end of the distribution line. A third method is proposed using the distribution line as a low-pass filter. In the case of a three-phase transformer, when it is switched, inrush current flows in either one or two phase windings. Instead of simultaneous switching of all the phases (windings), each winding of the transformer is switched at predetermined switching instants sequentially. Thus inrush currents are contained to a steady-state level using an instant-controlled switching circuit. Switching of all phases completes within 1/3 or 1/4 of the power-cycle depending upon the mode of transformer configuration and the switching strategy. The switching current is found to be the same as the steady-state no-load current. These schemes are useful for traction transformers as well as for poorly supplied and poorly maintained distribution lines including traction lines which are subjected to repeated switching View full abstract»

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  • Maximum power point tracking inverter for photovoltaic source pumping applications

    Publication Year: 1996 , Page(s): 883 - 886 vol.2
    Cited by:  Papers (1)
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    Inverters powered from photovoltaic arrays are becoming popular for water pumping in remote areas. The viability of these pumps will depend on the amount of power made available from the photovoltaic array. Solar trajectory tracking schemes and maximum power point tracking (MPPT) schemes have been discussed in literature. This paper examines MPPT in detail as applicable to the V/F controlled induction motor driving a submersible pump. In these the speed of the motor is varied to utilise maximum power available under different irradiation conditions. The microcontroller based controller offers the flexibility in computing which is vital to the success of the scheme. Tests are conducted on a 1 HP pump operating from a photovoltaic source inverter to verify the subject View full abstract»

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  • Design and implementation of remote robotic control system for nuclear power plant application achieved through kinesthetic force feedback model

    Publication Year: 1996 , Page(s): 1018 - 1023 vol.2
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    The technology of telerobotic control through a universal and transparent man-machine interface is a growing field of robotics research in today's industrial scenario because of its promising application in hazardous and unstructured environments. The joystick, a sophisticated information receiver-translator-transmitter device, serves as a man-machine interface for telerobots. The present paper describes the developmental paradigms of a remote control system for a planar four degrees of freedom joystick following position feedforward force/torque feedback strategy in a bi-lateral mode. This joystick-based control technology is designed to actuate an industrial robot working in a nuclear power plant. The remote control system has been illustrated with a model, algorithm, electronic hardware and software routine along with experimental results in order to have effective telemanipulation View full abstract»

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  • High-efficiency zero current soft switching mode high-frequency inverter using normally off bipolar mode SIT for induction-heating

    Publication Year: 1996 , Page(s): 801 - 806 vol.2
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    This paper is mainly concerned with a half-bridge voltage-clamped high frequency induction heating inverter circuit using a high-power bipolar-mode normally-off type static induction transistor, which efficiently operates in a zero current soft-switching (ZCS) mode. This proposed ZCS inverter is found to work safely with sufficiently high conversion efficiency. A new conceptional induction heating power supply is mentioned from a practical point of view View full abstract»

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  • High temperature performance of high-power GaAs Schottky and silicon p-i-n rectifiers in hard- and soft-switching power converters

    Publication Year: 1996 , Page(s): 981 - 985 vol.2
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    The dynamic switching characteristics of 200 V high-power GaAs Schottky and Si p-i-n rectifiers are studied at various temperatures under both hard and soft switching conditions. Devices were first characterized to measure forward and reverse I-V, C-V, reverse breakdown voltage and reverse recovery performances. The same devices were characterized for turn-on and turn-off in switching circuits designed to study the dynamic switching performances under hard and soft switching conditions at different temperatures. Advanced finite element based mixed device and circuit simulations were used to study the internal plasma dynamics under boundary conditions imposed by circuit operation. It is shown that, for hard switching applications, GaAs Schottky power rectifiers exhibit significantly reduced switching power losses compared to Si p-i-n rectifiers. For soft switching applications, there is no significant difference in the switching power losses for these two devices. Diode performance at elevated temperatures is studied and the temperature dependencies of switching and conduction power losses are analyzed View full abstract»

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  • A novel asymmetrical duty-cycle soft-switching DC-DC converter with lower conduction losses than in hard-switched PWM converters

    Publication Year: 1996 , Page(s): 727 - 733 vol.2
    Cited by:  Papers (1)
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    An asymmetrical duty-cycle DC-DC power converter was proposed recently, which allows zero-voltage switching while keeping the switch conduction losses as low as in standard hard switched PWM power converters. Further developments now allow the asymmetrical circuit to exhibit lower conduction losses than standard PWM circuits View full abstract»

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