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Energy Conversion, IEEE Transactions on

Issue 4 • Date Dec. 1999

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Displaying Results 1 - 25 of 124
  • Bibliography on induction motors faults detection and diagnosis

    Page(s): 1065 - 1074
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    This paper provides a comprehensive list of books, workshops, conferences, and journal papers related to induction motors faults detection and diagnosis. View full abstract»

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  • Experience with standstill frequency response (SSFR) testing and analysis of salient pole synchronous machines

    Page(s): 1209 - 1217
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    Standstill frequency response (SSFR) testing and analysis of salient pole synchronous generators and motors performed by the members of the Working Group are summarized. The papers presented in a panel session at the 1997 Winter Power Meeting are condensed into this paper for the benefit of future researchers. The pertinent features of SSFR testing and analysis of salient pole machines are described to point out the differences from those of round rotor turbogenerators extensively published in the literature. View full abstract»

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  • Author index

    Page(s): 1 - 8
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    Freely Available from IEEE
  • Subject index

    Page(s): 9 - 30
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    Freely Available from IEEE
  • Large low-cost single-phase SEMIHEXTM motors

    Page(s): 1353 - 1358
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    These low-cost single-phase motors are 3-phase high efficiency induction motors with the SEMIHEXTM connection of the windings to 2 run capacitors. The single-phase winding currents at full load are the same as if the motors were connected to a 3-phase source. The single-phase full-load efficiencies are the same as the 3-phase efficiencies. The line starting current is unity power factor and is approximately two times the full-load current for motors between 10 HP and 100 HP View full abstract»

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  • Parameter estimation of induction machines under sinusoidal PWM excitation

    Page(s): 1218 - 1223
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    This paper proposes the use of linear estimation techniques to determine the electrical parameters of a three phase induction machine. The linear regression models are derived from the dynamical machine model. The method permits estimation of a set of four basic parameters namely the stator resistance, the rotor time constant, the stator inductance and the transient inductance. The parameters are estimated using only sinusoidal PWM voltage waveform with a single machine operating point. In the case of the stator resistance estimation a DC voltage is added to sinusoidal voltage. Moreover, to estimate the transient inductance, the stator inductance and the rotor time constant no special signals are required. The data vector employed in the estimation procedure is obtained from the phase measurement data. Several simulation and experimental results concerning the use of the proposed approach to the modeling of a three phase induction machine are presented View full abstract»

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  • Neural network based saturation model for round rotor synchronous generator

    Page(s): 1019 - 1025
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    This paper presents an artificial neural network (ANN) based technique to model saturation for a round rotor synchronous generator. The effects of excitation level, rotor angle, and real power generation on generator saturation are included in the modeling process. To illustrate the technique, small excitation disturbance tests are conducted on a 7.5 kVA, 240 V, 60 Hz round rotor synchronous generator at various levels of excitation and loading. The small excitation disturbance responses are processed by a recursive maximum likelihood algorithm to yield estimates of mutual inductances Lad and L aq at each operating condition. By developing a suitable training pattern, variables representative of generator operating condition are mapped to mutual inductances Lad and Laq . The developed models are validated with measurements not used in the training process and with large disturbance responses View full abstract»

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  • Application of a new optimization approach to the design of electrical wheels

    Page(s): 952 - 958
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    This paper deals with the optimization of the design of electrical wheels. A new approach is used that generates the optimization software. It allows the design to be made with a more elaborate analytical model of the structure chosen for the wheel. Thus, it is possible to obtain a very efficient optimization program. This is illustrated on the example of an electrical wheel for a bicycle View full abstract»

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  • Transient overvoltages in electrical motors during sequential pole closure

    Page(s): 1057 - 1064
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    This paper addresses the problem of transient overvoltages in electrical motors during sequential pole closure in industrial installations. A computer model that includes the circuit breaker, high-voltage cable and electrical motor is proposed. Multiconductor transmission line theory and modal analysis are applied to the components and the piecewise Fourier transform is used to simulate sequential pole closure. The mechanism of sequential pole closure is analyzed including parallel capacitors and series inductors. Critical times for switching transients are calculated. Finally, the effect of several system and machine parameters on transient overvoltages is investigated View full abstract»

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  • Modeling and simulation of DC motors in dynamic conditions allowing for the armature reaction

    Page(s): 1288 - 1293
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    Drives using DC motors are still extensively used in industrial plants all over the world. Nevertheless, the methods adopted to analyze the control system of such drives frequently involve several simplifications, chiefly in the modeling of the electrical machine. One of the main difficulties in modeling an electrical machine is related to the effects of the armature reaction, particularly under transient conditions. This paper presents a model suitable for transient studies of DC motors, including the overall effects of the armature reaction: saturation, commutation and interpoles action. The proposed model is used to simulate the motor operation in dynamic conditions and the results are compared with laboratory tests made on a real machine showing good agreement View full abstract»

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  • Estimation of voltage distribution on the inverter fed random wound induction motor windings supplied through feeder cable

    Page(s): 976 - 981
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    In this paper, a method of estimating the voltage distribution among the windings of an inverter fed random wound induction motor supplied through feeder cable is presented. The inverter-cable-motor model is developed, and the transient analysis is performed using ATP (Alternative Transient Program) package to estimate the voltage distribution among the motor windings. The high frequency parameters of the induction motor are calculated using field analysis and the parameters of the cable are computed using the Cable Constants routine in the ATP package. Using these parameters, a high frequency equivalent circuit of the inverter-cable-motor model is formed in ATP which is then used to estimate the voltage stresses at the motor terminals and the motor windings. Using this model, the effects of cable length on the voltage distribution among the motor winding is analyzed and discussed. In order to check the validity of the model, simulation results are compared with the experimental results. The proposed model is a general purpose model and hence can be used for detailed transient analysis with different configurations of the cable and terminal filters View full abstract»

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  • Conducting screen utilisation in switched reluctance motors

    Page(s): 946 - 951
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    In this paper, the effect of incorporating nonmagnetic electrical conducting screens in the motor topology of a switched reluctance motor is investigated. It is shown that screens on the rotor increase the motor torque by reducing the effective unaligned AC inductance due to the eddy currents induced in the screens. Screens added to the end laminations on both the rotor and stator stacks are shown to minimise the end flux leakage. Details of experimental and analytical methods used to evaluate the effects of conducting screens are provided and test results on a 500 W motor are included View full abstract»

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  • Self-tuning steam turbine controller in a multi-machine power system

    Page(s): 1578 - 1581
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    This paper investigates a self-tuning steam turbine control scheme designed to improve the quality of control of power system frequency. The recursive least-squares estimation algorithm and minimum-variance control technique are implemented to synthesize the turbogenerator speed control loop. Computer simulations of a 5-unit power system show that employing this type of control is effective in curbing excessive over- and under-frequency deviations and alleviating generator and load sheddings for major disturbances View full abstract»

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  • High performance IPMSM drives without rotational position sensors using reduced-order EKF

    Page(s): 868 - 873
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    An extended Kalman filter (EKF) based approach for position sensor elimination in interior permanent magnet synchronous motor (IPMSM) drives is presented in this paper. The EKF is capable of estimating system parameters and state variables for the IPMSM by eliminating virtually all influences of structural noises in the vector control scheme. This paper presents a design method of a reduced-order EKF. Position and angular speed of the rotor are obtained through the reduced-order EKF only by measuring stator currents. Also, due to an angle modification scheme with error tracking, the sensorless drive system is robust to parameter variations. Simulation and experimental results are provided to verify the proposed approach based on the reduced-order EKF View full abstract»

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  • Increased sensitivity of capacitive couplers for in-service PD measurement in rotating machines

    Page(s): 1184 - 1192
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    Capacitive couplers are widely used as sensors for in-service/online partial discharge (PD) measurement in rotating machines. They are permanently installed in operating generators and motors to detect partial discharges. The capacitive couplers traditionally used for PD detection on rotating machines have been 80 pF. Recently it has been found that higher detection sensitivity can be obtained by increasing capacitance of 80 pF couplers. This paper presents theoretical analysis, laboratory tests and field test experience to compare traditional 80 pF couplers and higher-capacitance couplers for in-service PD measurement in rotating machines. The frequency bandwidth of various capacitive couplers is characterized and analyzed in relation to the PD detection sensitivity. This investigation concludes capacitive couplers with a higher capacitance than 80 pF are more sensitive for in-service PD measurement in rotating machines. More partial discharges and higher PD magnitudes can be acquired by using higher capacitance couplers than 80 pF couplers View full abstract»

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  • On equivalent circuit modeling for synchronous machines

    Page(s): 982 - 988
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    This paper presents alternative equivalent circuits for modeling the steady state frequency response (SSFR) data measured for turboalternator synchronous machines. These models provide direct representation of the frequency-dependent skin-effect properties of the dampers and rotor iron. The parameters are determined by matching the measured data to the model frequency response using standard optimization methods. The accuracy of matching is comparable to that of conventional third-order d-q models but the required number of parameters is reduced View full abstract»

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  • Simulation of the impulse response of electrical machines

    Page(s): 861 - 867
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    This paper presents three different methods for modeling the transient response of electrical machines. The state-space approach, the Laplace transformation technique and the realization of a new, wide-frequency range equivalent circuit of the machine terminal impedance are applied to obtain the transient response to any waveform. The introduced methods are based on the frequency response of the machine which is often seen as a black box. Both laboratory- and large-scale machines are used to investigate the effect of a variety of impulse waveforms on the transient response of the other phases and to obtain the voltage distribution along the winding of each phase. A frequency response test for the machine is applied to obtain the resonance frequencies and the rational forms for both the voltage gains and terminal impedance. Excellent agreement (error is within 3%) is found between the three methods and the experimental results for different types and ratings of electrical machines under different impulse waveforms View full abstract»

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  • A robust PM synchronous motor drive with adaptive uncertainty observer

    Page(s): 989 - 995
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    A robust controller, which combines the merits of integral-proportional (IP) position control and adaptive control, is designed for a permanent magnet (PM) synchronous motor (SM) drive in this study. First, an IP position controller is designed according to the estimated plant model to match the time-domain command tracking specifications. Second, an adaptive uncertainty observer, which is implemented to estimate the lump of uncertainty of the controlled plant, is described. Then, a robust controller is formulated using the adaptive uncertainty observer to increase the robustness of the motor drive system. The effectiveness of the proposed controller is demonstrated by both simulation and experimental results View full abstract»

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  • Smooth speed control of single-phase induction motors by integral-cycle switching

    Page(s): 1094 - 1099
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    AC phase controlled switching is used for the speed control of single-phase induction motors but it introduces large high-order harmonics. Alternatively, an integral-cycle control method is also available but it introduces sub-harmonics in the line and the output voltage is adjustable in steps only. To mitigate these situations, a discontinuous phase-controlled switching technique is proposed. The voltage control is done by a combination of the phase control and the integral-cycle switching. Fine voltage and step voltage are controlled by the former and the latter methods respectively. For fan-type loads, performance of the proposed controller improves when this technique is applied to control the main winding voltage only. In case of constant-torque loads, conventional voltage controllers including AC regulators offer a very limited speed control range. The strong sub-harmonics of the controlled voltage due to integral-cycle control is used for such loads. The rotor is forced to lock at any desired sub-synchronous speed. Different types of motors operate smoothly over a wide range for fan-type loads and near various subsynchronous speed at derated conditions for constant torque loads View full abstract»

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  • Relationships between parameter sets of equivalent synchronous machine models

    Page(s): 1075 - 1080
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    This paper presents transformation rules between the parameters of two synchronous machine models having exactly the same terminal and electro-mechanical behaviour. These equations are valid for any model order and for a broad range of equivalent circuit topologies. The equations show that the simulation capability of a synchronous machine model is not affected by a `bad choice' of the field to armature turns ratio View full abstract»

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  • Transient performance of an isolated induction generator under unbalanced excitation capacitors

    Page(s): 887 - 893
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    This paper presents transient performance of a stand-alone self-excited induction generator (SEIG) under unbalanced excitation capacitors. An approach based on a three-phase induction machine model is employed to derive dynamic equations of an isolated SEIG under unbalanced conditions. The neutral points of both a Y-connected excitation capacitor bank and Y-connected stator windings of the SEIG is connected together through a neutral line. Experimental results obtained from a laboratory 1.1 kW induction machine driven by a DC motor are also performed to confirm the feasibility and effectiveness of the proposed method View full abstract»

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  • Calculation of leakage inductances of a salient-pole synchronous machine using finite elements

    Page(s): 1156 - 1161
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    An analysis method for calculating three components of leakage inductances, i.e. the stator, rotor and winding distribution differential leakage inductances, which properly represent the amount of each leakage flux in a salient-pole synchronous machine is presented. The winding distribution differential leakage inductance has a positive value mainly arising from the difference between the armature and field winding distributions. The value of the turns ratio must be changed as the saturation condition changes in order to transform leakage inductances into the proper armature base values. Calculated leakage inductances are shown to validate the method. Further investigations using the presented analysis may generate useful knowledge for pole designs View full abstract»

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  • An introduction to electric machine modeling by systems of noninteger order. Application to double-cage induction machine

    Page(s): 1026 - 1032
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    The flowing of induced currents in electric machines, especially in the deep-bars of induction machine cages and the dampers of synchronous machines, implies an increase in the order of the equivalent circuits used to model their frequency response. But, physical meanings of the circuit parameters are often lost. Thus, the authors propose to go back over the modeling of skin effect in order to define noninteger order equivalent circuits which would be linked with the consequences of induced currents on the frequency response. In this paper, the proposed equivalent circuit is based on half-order systems. It is used to represent the frequency response of a 30 kW 4 pole double-cage induction machine and its results are compared with measurements View full abstract»

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  • Effect of overexcitation limiters on power system long-term modeling

    Page(s): 1529 - 1536
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    In this paper we analyze the dynamic performance of a power system with generators operating under rotor current limitation considering various models of takeover and summed-type overexcitation limiters (OELs). It is shown that in certain cases the field current limitation introduces slow generator dynamics that interact with long-term dynamic devices, such as LTCs, whereas in other cases the generator dynamics remain fast even after the limitation of rotor current. Equations suitable for a quasi steady state (qss) simulation corresponding to several OEL dynamic models are derived and the results are compared to those obtained by a full simulation View full abstract»

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  • A model reference & sensitivity model-based self-learning fuzzy logic controller as a solution for control of nonlinear servo systems

    Page(s): 1479 - 1484
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    In this paper, the design, simulation and experimental verification of a self-learning fuzzy logic controller (SLFLC) suitable for the control of nonlinear servo systems are described. The SLFLC contains a learning algorithm that utilizes a second-order reference model and a sensitivity model related to the fuzzy controller parameters. The effectiveness of the proposed controller has been tested in the position control loops of two chopper-fed DC servo systems, first by simulation in the presence of a backlash nonlinearity, then by experiment in the presence of a gravity-dependent shaft load and fairly high static friction. The simulation and experimental results have proved that the SLFLC provides desired closed loop behavior and eliminates a steady-state position error 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