IEE Proceedings - Electric Power Applications
Volume 148, Issue 5, September 2001
Volumes & issues:
Volume 148, Issue 5
September 2001
-
- Author(s): H. Ogiwara ; L. Gamage ; M. Nakaoka
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 5, p. 385 –392
- DOI: 10.1049/ip-epa:20010572
- Type: Article
- + Show details - Hide details
-
p.
385
–392
(8)
This paper presents a novel quasiresonant high frequency inverter at a fixed frequency of 200 kHz using static induction transistors (SITs) as power semiconductor switches. It is designed to operate under zero-volt switching to minimise switching losses, electrical stresses and EMI noises over a wide range of regulated output power. Its output power can be regulated effectively by adjusting the duty cycle of the switching signals fed to the active switches. Its circuit operation and performance are analysed by computer-aided simulation. The simulation results are in good agreement with experimental ones obtained from a feasible breadboard. As a result, it is finding wide industrial applications, especially for induction heating. - Author(s): J.F. Moreno ; F.P. Hidalgo ; M.D. Martínez
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 5, p. 393 –397
- DOI: 10.1049/ip-epa:20010580
- Type: Article
- + Show details - Hide details
-
p.
393
–397
(5)
Tests are described to determine the parameters and coefficients of a thermal model, which allows one to estimate the stator and rotor temperatures in a three-phase induction machine, during operation. The model is obtained by analysing the power losses and the heat transmission inside the motor (considering it in two parts: stator and rotor) and with the environment. Two differential equations are deduced, which reflect, at each instant, the balance among the power losses, the evacuated heat and the stored heat in the motor. The study is carried out for a three-phase motor with a short-circuited rotor in a squirrel cage with nominal values: 1 kW, 380 V and 50 Hz. From the stator and rotor temperatures provided by the thermal model, the updated values of the electrical resistances of the machine are obtained in real time during its operation. - Author(s): X.F. Shi and C.Y. Chan
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 5, p. 398 –402
- DOI: 10.1049/ip-epa:20010528
- Type: Article
- + Show details - Hide details
-
p.
398
–402
(5)
Passivity-based adaptive controllers are presented for the stabilisation of the buck quasi-resonant convertor. Both direct and indirect voltage regulation schemes are addressed. The circuit components of the convertor are assumed constant but unknown. The adaptive controllers are designed based on the average model of the convertor and follow the ‘energy shaping plus damping injection’ ideas of the passivity-based approach. Simulation results are presented to illustrate the features of these proposed adaptive controllers. - Author(s): K.W.E. Cheng
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 5, p. 403 –409
- DOI: 10.1049/ip-epa:20010516
- Type: Article
- + Show details - Hide details
-
p.
403
–409
(7)
The paper presents a family of zero-current-switching switched-capacitor circuits based on the classical multiswitch switched-capacitor converters. The family of circuits consists of three topologies and provides different voltage conversion ratios. All the power devices including switches and diodes in the circuit are zero-current switching. The circuits also minimise the current stress and the pulsation current which are found in the classical circuits. The output power is higher than the classical switched-capacitor converter. Computer simulation and experiments verify the operation and performance of the circuits. - Author(s): M. Veerachary ; T. Senjyu ; K. Uezato
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 5, p. 410 –418
- DOI: 10.1049/ip-epa:20010573
- Type: Article
- + Show details - Hide details
-
p.
410
–418
(9)
This paper presents a systematic development of a unified SFG model for an N-cell interleaved DC-DC converter system operating in continuous current mode. From this SFG small, large-signal and steady-state models are developed, which are useful to study the converter behaviour. Converter performance expressions like voltage gain, efficiency and other small-signal transfer functions are derived. A straightforward algorithm is developed to draw the unified SFG of an N-cell interleaved converter system without going into the rigorous procedure. Development of a unified signal flow graph is explained for a 3-cell interleaved converter system. Derivation of large, small-signal and steady-state models from the unified SFG is demonstrated by considering a 2-cell interleaved converter system. A large-signal model is programmed in a TUTSIM simulator, and the large-signal responses against supply, load disturbances are predicted. Signal flow graph analysis results are validated with PSIM simulations. Experimental observations are provided to validate the SFG modelling method. - Author(s): G.A. Karvelis ; M.D. Manolarou ; P. Malatestas ; S.N. Manias
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 5, p. 419 –424
- DOI: 10.1049/ip-epa:20010539
- Type: Article
- + Show details - Hide details
-
p.
419
–424
(6)
An active clamp topology for forward converters is presented and analysed in detail in this paper. The proposed circuit overcomes the drawbacks of the already existing reset techniques, since it utilises the magnetising energy that was formerly being dissipated in the clamp resistor. The stored energy supplies a second auxiliary output but can also be driven to the main output, thus increasing the efficiency of the converter. Finally, in order to verify the theoretical and simulated results, an experimental unit was built. A good consistency of the results has been found. - Author(s): K.W.E. Cheng ; H.Y. Wang ; D. Sutanto
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 5, p. 425 –430
- DOI: 10.1049/ip-epa:20010564
- Type: Article
- + Show details - Hide details
-
p.
425
–430
(6)
A novel control strategy is proposed: adaptive B-spline neural network for three-phase AC/DC voltage source converters, which realises a sinusoidal AC input current and unity power factor. Compared with other PWM techniques, neural network control provides an excellent component of a nonlinear system and is adaptive enough to fit the environment change. An on-line B-spline neural network is used because of its local weight updating characteristic, which has the advantages of fast convergence speed and low computation complexity. This is very important for real-time control applications. Both simulation and experimental results are presented to verify the effectiveness of the proposed control strategy. - Author(s): M. Ishibashi ; M. Nakaoka ; Y. Konishi
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 5, p. 431 –437
- DOI: 10.1049/ip-epa:20010488
- Type: Article
- + Show details - Hide details
-
p.
431
–437
(7)
A novel prototype topology of a three-phase current-fed PWM converter with a switched capacitor type quasi-resonant snubber is proposed in the paper, which can operate under the principle of zero current switching (ZCS) commutation. However, soft switching performance is affected by output DC current in the proposed quasi-resonant snubber. In particular, PWM current is decreased in the small current region with DC current on the output side, because the charging and discharging period of a switched capacitor increases as the output DC current decreases. The operating performance in the small current region with DC current on the output side, for which performance is problematic in this converter, is investigated in the paper. Further, converter performances from the relationship between soft switching performance and the charging and discharging periods of the switched capacitor are estimated on the basis of the experimental results by a laboratory prototype of this converter. - Author(s): N. Ben-Hail and R. Rabinovici
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 5, p. 438 –442
- DOI: 10.1049/ip-epa:20010581
- Type: Article
- + Show details - Hide details
-
p.
438
–442
(5)
The three-phase autonomous reluctance generator is analysed. It is shown that the linear mathematical model of the generator in the rotor reference frame is composed of time-invariant differential equations. The effect of the load on the stability of the system is considered. Simple equations relate the reluctance generator parameters and the external load. These equations are adopted as a basis for new methods of finding the machine parameter characteristics. The presented new methods of the machine parameter measurement and the known conventional methods are compared. The steady-state value of the reluctance generator variables can be found by solving algebraic equations, without resorting to numerical methods. - Author(s): H. Iwamoto ; H. Kondo ; Y. Yu ; A. Kawakami ; M. Nakaoka
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 5, p. 443 –448
- DOI: 10.1049/ip-epa:20010487
- Type: Article
- + Show details - Hide details
-
p.
443
–448
(6)
The results of investigation on turn-off dynamic operations of IGBTs are presented in the paper. Three-types of IGBTs which have planar and trench gate structures by epitaxial wafer and planar gate structure by nonepitaxial wafer are compared under conditions of hard and soft switching commutation topologies. Collector-emitter voltage and collector current waveforms of each IGBT and power losses are analysed under conditions of various parameters through simulation and in experiment. Moreover, carrier behaviour, electric field and potential distributions inside the chips are studied by simulation technique. It is noted that the trench gate IGBT has an advantage over the other-types for the hard switching application from the point of view of switching losses, and both the planar and trench gate IGBTs on the basis of an epitaxial wafer are more suitable for soft switching applications because of lower switching and on-state losses. - Author(s): L. Xu ; V.G. Agelidis ; E. Acha
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 5, p. 449 –455
- DOI: 10.1049/ip-epa:20010527
- Type: Article
- + Show details - Hide details
-
p.
449
–455
(7)
The paper addresses key issues surrounding the development of static VAr compensators (STATCOM). The STATCOM is based on a conventional six-switch bi-directional voltage-source convertor topology using insulated gate bipolar transistors. The sinusoidal pulse-width modulation technique is used to control the convertor output voltage (amplitude and phase). Three DC voltage control methods and the trade-off between the value of the DC capacitor and the ripple voltage and the system's transient response time are investigated. The system's control, incorporating a VAr calculator and synchronisation, is implemented on a digital signal-processing board, to achieve excellent overall performance. Experimental results for both leading and lagging VAr compensation, along with changes between them, confirm the good performance and the flexibility of the developed prototype. - Author(s): J. Wang ; G.W. Jewell ; D. Howe
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 5, p. 456 –464
- DOI: 10.1049/ip-epa:20010512
- Type: Article
- + Show details - Hide details
-
p.
456
–464
(9)
The influence of the leading design parameters on the performance of slotless tubular permanent magnet machines, and the relative merits of different tubular machine topologies, are deduced from analytical field solutions. The force capability and force ripple are established as functions of a set of dimensional ratios, with due account of magnetic saturation and subject to a specific thermal constraint. The results provide an effective means of making comparative studies and optimising machine designs, and will aid the design process when addressing a given performance specification. - Author(s): C.S. Moo ; T.F. Lin ; Y.C. Hsieh
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 5, p. 465 –468
- DOI: 10.1049/ip-epa:20010577
- Type: Article
- + Show details - Hide details
-
p.
465
–468
(4)
A single-stage high power factor electronic ballast is designed to operate fluorescent lamps at a constant power over a very wide input voltage range. The electronic ballast performs the constant power operation by adjusting the duty-ratio of the embedded power regulation circuit. With duty-ratio control, a preheating period for the cathode filaments can be provided before igniting the lamp. The operation of the electronic ballast is discussed by an illustrative example with experimental results.
Quasiresonant soft switching PWM voltage-fed high frequency inverter using SIT for induction heating applications
Realisation of tests to determine the parameters of the thermal model of an induction machine
Passivity-based adaptive controllers for quasi-resonant buck convertor
Zero-current-switching switched-capacitor converters
Signal flow graph nonlinear modelling of interleaved converters
Analysis and design of non-dissipative active clamp for forward converters
Adaptive directive neural network control for three-phase AC/DC PWM converter
Performance evaluations of three-phase current-fed soft switching PWM converter with switched capacitor-type quasi-resonant snubber
Three-phase autonomous reluctance generator
Turn-off behaviour of epitaxial planar and trench gate IGBTs and nonepitaxial planar gate IGBT under hard and soft switchings
Development considerations of DSP-controlled PWM VSC-based STATCOM
Design optimisation and comparison of tubular permanent magnet machine topologies
Single-stage high power factor electronic ballast for fluorescent lamps with constant power operation
Most viewed content for this Journal
Article
content/journals/ip-epa
Journal
5
Most cited content for this Journal
We currently have no most cited data available for this content.