Issue 4 • Dec.-1997
Showing 1-25 of 27
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Analysis of the characteristics of single phase shaded pole induction motor with two short-circuited auxiliary phases
Publication Year: 1997,Page(s):269 - 274
Cited by: Papers (4)
This work presents a method of general two-phase harmonic symmetrical components, for the analysis and calculation of single-phase induction motor characteristics with shaded poles and two short circuited auxiliary phases. The method is based on rotating field theory applying the harmonic symmetrical current components of direct and inverse order. Thus, it is possible to make a motor characteristi...Show More
Controlled power transfer from wind driven reluctance generator
Publication Year: 1997,Page(s):275 - 281
Cited by: Papers (10)
The paper describes the dynamic performance of a wind-driven reluctance generator connected to an electric power network of large capacity. A controller that makes possible the regular flow of power to the network has been considered. Controller parameters that successfully suppress unwanted mechanical and electrical stresses and overshoots due to wind gusts, have been estimated. The performance o...Show More
Synchronous power output fluctuations for an experimental open-cycle OTEC plant
Publication Year: 1997,Page(s):282 - 288
Cited by: Papers (3)
A 210 kW experimental open-cycle ocean thermal energy conversion plant was completed in Hawaii in 1993, and equipped with a synchronous generator to test its connection to the local power grid. During shakedown tests, large power output fluctuations were observed. Linear mathematical models of the system were developed and numerical simulations reproduced observations well, for a given line freque...Show More
Synchronous power output fluctuations for an experimental open-cycle OTEC plant
Year: 1997 | Volume: 12 | Issue: 4
On-line evaluation of a round rotor synchronous machine parameter set estimated from standstill time-domain data
Publication Year: 1997,Page(s):289 - 296
Cited by: Papers (17)
This paper presents a method for identifying the best linear circuit model parameters of a three-phase, round rotor synchronous machine. Standstill time-domain test data and the maximum likelihood estimator are used to identify the values for the equivalent circuit models. The estimated models are validated against standstill data and an online test. A steady-state error adjustment procedure is in...Show More
A high-performance induction motor drive with on-line rotor time-constant estimation
Publication Year: 1997,Page(s):297 - 303
Cited by: Papers (29)
A high-performance induction motor (IM) speed drive with online adaptive rotor time-constant estimation and a proposed recursive least square (RLS) estimator is introduced in this paper. The estimation of the rotor time-constant is on the basis of the model reference adaptive system (MRAS) theory; and the rotor inertia constant, the damping constant and the disturbed load torque of the IM are esti...Show More
Torsional system parameter identification of turbine-generator sets
Publication Year: 1997,Page(s):304 - 309
Cited by: Papers (8)
Accurate low order linear models that represent the torsional motion of turbine-generator sets are needed for determining shaft torsional responses resulting from subsynchronous resonance conditions, electric system faults and planned/unplanned switching actions in the electric network. This paper outlines the theoretical background and the methodology used for identification of linear state-space...Show More
Torsional system parameter identification of turbine-generator sets
Year: 1997 | Volume: 12 | Issue: 4
A new suboptimal pulse-width modulation technique for per-phase modulation and space vector modulation
Publication Year: 1997,Page(s):310 - 316
A new suboptimal pulse-width modulation (PWM) technique for power converter applications is presented in this paper. The technique is developed by considering both two-phase and three-phase modulation techniques. In comparison with the existing suboptimal PWM techniques, the new suboptimal technique provides online calculation, extension of maximum linear modulation index, and can be applied to bo...Show More
Smooth starting of slip ring induction motors
Publication Year: 1997,Page(s):317 - 322
Cited by: Papers (9)
The starting of three-phase wound rotor induction motors by stepped resistances added in the rotor circuit suffers from several problems. This paper suggests a novel method of motor starting by inserting a parallel combination of resistance, inductance and capacitance in the rotor circuit. The proposed method guarantees a smooth and high starting torque over most of the starting period besides a c...Show More
A rotor-flux-observer-based composite adaptive speed controller for an induction motor
Publication Year: 1997,Page(s):323 - 329
Cited by: Papers (8)
A composite adaptive speed controller for an induction motor based on a rotor-flux-observer is proposed in this paper. The rotor flux is estimated with the simplified rotor-flux-observer on the rotor reference frame and the input-output linearization theory is used to decouple the motor speed and the rotor flux. Then, the composite adaptive algorithm is used as the speed controller of the inductio...Show More
Development and performance testing of a 200 kVA damperless superconducting generator
T. Suryanarayana;J.L. Bhattacharya;K.S.N. Raju;K.A. Durga Prasad
Publication Year: 1997,Page(s):330 - 336
Cited by: Papers (3)
A 200 kVA, 3000 RPM superconducting generator has been developed and tested. The rotor has been wound with superconducting wire of Nb-Ti alloy. A closed-circuit liquid helium system has been designed and installed for cooling the superconducting windings. The stator carries the air-gap type armature windings and a laminated-iron flux-shield. A new concept in the design of superconducting generator...Show More
Dynamic harmonic field analysis of a cage type induction motor when magnetic slot wedges are applied
Publication Year: 1997,Page(s):337 - 343
Cited by: Papers (39)
Applying magnetic slot wedges to stator slot openings is an effective means to reduce the slot ripple harmonic components in the magnetic field. To investigate the effect of the wedges in detail, this paper proposes a new harmonic field analysis method that considers the rotor movement dynamically and the harmonic components of the secondary current as induced current by a two-dimensional finite e...Show More
A new method to approximate stator transients of synchronous machines in power system simulation
Publication Year: 1997,Page(s):344 - 350
Cited by: Papers (5)
This paper presents a new method to approximate the effects of stator transients of synchronous machines in power system transient stability simulations during unsymmetrical faults. This method can approximate the DC offset currents which arise from the stator and network transients during faults. However, the method is based on the traditional model with stator and network transients neglected.Show More
This paper explores the use of an interior permanent-magnet synchronous machine (IPM) as a source of controlled DC power. A three-phase diode rectifier converts the generated AC power into DC, which is further processed by a buck or boost DC-DC converter with a pulse-width modulation voltage controller for load voltage and output power regulation. The modeling and analysis of the generator system ...Show More
Synchronous operation of a dual-winding reluctance generator
Publication Year: 1997,Page(s):357 - 362
Cited by: Papers (39)
This paper sets forth the analysis and performance characterization of the dual-winding reluctance machine fed with direct current control winding excitation operating as a generator. Saturation effect, core and harmonic losses are included in the dynamic and steady state models of the generator feeding either an impedance or a rectifier load which give calculation results that compare favorably w...Show More
Comparison of techniques for measurement of shaft currents in rotating machines
Publication Year: 1997,Page(s):363 - 367
Irregularities in the magnetic circuits of motors may result in spurious voltages that lead to shaft currents through the shaft, bearings, bearing supports and closing through the machine framework. The IEEE Standard Test Procedure for Polyphase Induction Motors and Generators discusses the shaft current and presents a measurement method for recording either the voltage across the ends of the shaf...Show More
Effects of long-shunt and short-shunt connections on voltage variations of a self-excited induction generator
Publication Year: 1997,Page(s):368 - 374
Cited by: Papers (62)
This paper presents a comparative study of steady-state performances of both long-shunt and short-shunt configurations of an isolated self-excited induction generator under various loading conditions. Both simulated and experimental results are clearly compared to examine the effects of both connections on load voltage variation of the studied induction generator. The analyzed results show that th...Show More
Neuro-fuzzy controller of low head hydropower plants using adaptive-network based fuzzy inference system
Publication Year: 1997,Page(s):375 - 381
Cited by: Papers (30)
This paper presents an attempt of nonlinear, multivariable control of low-head hydropower plants, by using adaptive-network based fuzzy inference system (ANFIS). The new design technique enhances fuzzy controllers with self-learning capability for achieving prescribed control objectives in a near optimal manner. The controller has flexibility for accepting more sensory information, with the main g...Show More
An adaptive power system stabilizer using on-line trained neural networks
Publication Year: 1997,Page(s):382 - 387
Cited by: Papers (62)
This paper presents an approach to the design of an adaptive power system stabilizer (PSS) based on on-line trained neural networks. Only the inputs and outputs of the generator are measured and there is no need to determine the states of the generator. The proposed neural adaptive PSS (NAPSS) consists of an adaptive neuro-identifier (ANI), which tracks the dynamic characteristics of the plant, an...Show More
An adaptive power system stabilizer using on-line trained neural networks
Year: 1997 | Volume: 12 | Issue: 4
An orthogonal test approach based control parameter optimization and its application to a hydro-turbine governor
Publication Year: 1997,Page(s):388 - 393
Cited by: Papers (25)
The control parameters of the industrial controller should be tuned to match the characteristics of the controlled system, at installation and even during operation. However, many existing controllers can not complete this task themselves. An expert's intervention is usually expected. A control parameter optimization algorithm based on the orthogonal test approach is described in this paper. This ...Show More
Adaptive fuzzy logic control of a turbine generator system
Publication Year: 1997,Page(s):394 - 399
Cited by: Papers (25)
This paper is concerned with the application of an adaptive, fuzzy logic controller to a synchronous generator system. Significant reductions in the amount of required calculations have been made which allow a direct analysis of the system. A novel on-line training algorithm is proposed to adapt fuzzy rule base which is shown to converge globally and provide the desired regulation for disturbances...Show More
Integrated fuzzy logic generator controller for stability enhancement
Publication Year: 1997,Page(s):400 - 406
Cited by: Papers (37)
An integrated fuzzy logic controller is proposed in this paper for the generator excitation and speed governing control. The proposed controller has three control loops: the first one is the voltage control loop which has the function of automatic voltage regulator (AVR), the second one is the damping control loop which has the function of power system stabilizer (PSS), and the last one is the spe...Show More
Integrated fuzzy logic generator controller for stability enhancement
Year: 1997 | Volume: 12 | Issue: 4
Realistic electric vehicle battery evaluation
Publication Year: 1997,Page(s):407 - 412
Cited by: Papers (16)
The STM-5-140 nickel cadmium electric vehicle battery was tested under actual operating conditions using the UMASS Lowell battery evaluation laboratory. The battery evaluation system uses battery current data taken from an EV using its on board data acquisition system. The car is driven on a typical commute while battery current as well as other data are taken at one second intervals. In the batte...Show More
An adaptive power system stabilizer based on recurrent neural networks
Publication Year: 1997,Page(s):413 - 418
Cited by: Papers (74)
Application of recurrent, neural networks in the design of an adaptive power system stabilizer (PSS) is presented in this paper. The architecture of the proposed adaptive PSS has two recurrent neural networks. One functions as a tracker to learn the dynamic characteristics of the power plant and the second one functions as a controller to damp the oscillations caused by the disturbances. In the pr...Show More
An adaptive power system stabilizer based on recurrent neural networks
Year: 1997 | Volume: 12 | Issue: 4
Investigation of oscillatory problems of hydraulic generating units equipped with Francis turbines
Publication Year: 1997,Page(s):419 - 425
Cited by: Papers (31)
In the paper a method is presented for the study of oscillatory problems of hydraulic generating units equipped with Francis turbines. The accurate equations of the turbine are implemented for the simulation, taking into account water hammer effect. Partial derivatives of turbine flow rate and torque with respect to head and gate opening are deduced from real measurements for the whole leading ran...Show More
Contact Information
Editor-in-Chief
Dionysios Aliprantis
Professor
Purdue University, Elmore Family School of Electrical and Computer Engineering
West Lafayette
USA
dionysis@purdue.eduContact Information
Editor-in-Chief
Dionysios Aliprantis
Professor
Purdue University, Elmore Family School of Electrical and Computer Engineering
West Lafayette
USA
dionysis@purdue.eduIEEE Account
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