IEE Proceedings - Electric Power Applications
Volume 148, Issue 6, November 2001
Volumes & issues:
Volume 148, Issue 6
November 2001
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- Author(s): A. Shenkman ; B. Axelrod ; Y. Berkovich
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 6, p. 469 –474
- DOI: 10.1049/ip-epa:20010610
- Type: Article
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p.
469
–474
(6)
A new single-switch parallel resonant converter for induction heating is introduced. The circuit consists of an input LC filter, bridge rectifier and one controlled power switch. The switch operates in a soft commutation mode and serves as a high-frequency generator. Output power is controlled via a switching frequency. Steady-state analysis of the converter operation is presented. Theoretical analysis, computer simulation and experimental results are in good agreement. - Author(s): Y.P.B. Yeung and K.W.E. Cheng
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 6, p. 475 –480
- DOI: 10.1049/ip-epa:20010637
- Type: Article
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p.
475
–480
(6)
A family of zero-current switching fixed frequency square wave resonant converters is proposed. Output voltage of these converters can be regulated by the on-state period of a semiconductor switch; and therefore, they can be operated in fixed switching frequency. All of the switching devices are in zero-current switching and resonant-transition conditions. Therefore the peak current of each switching device is minimised. Complete circuit analysis, computer simulation and experimental results are presented to support the operation of the converters. - Author(s): I.-D. Kim ; E.-C. Nho ; J.-S. Ko
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 6, p. 481 –486
- DOI: 10.1049/ip-epa:20010667
- Type: Article
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p.
481
–486
(6)
The snubber circuit makes use of Undeland and McMurray snubbers in the basic snubber unit, and can be regarded as a generalised combined Undeland and Mcmurray snubber. The proposed snubber features fewer components, improved efficiency due to low snubber loss, overvoltage clamping across main switching devices, and no imbalance problem of the blocking voltage. The proposed concept of constructing a snubber circuit for a four-level inverter and converter can apply to any level of converter and inverter. - Author(s): H. Takano ; T. Domoto ; J. Takahashi ; M. Nakaoka
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 6, p. 487 –493
- DOI: 10.1049/ip-epa:20010668
- Type: Article
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p.
487
–493
(7)
A prototype of voltage-source soft-switching PWM inverter-type auxiliary resonant bridge-leg link snubbers is proposed with bidirectional active power switches and voltage clamping diodes for a new high-power high-voltage application. The voltage clamping diodes in the active resonant snubber are more effective in protecting the bidirectional active switches in the bridge-leg linked auxiliary resonant snubber from surge voltage spikes caused by energy stored in the auxiliary quasiresonant inductors and inductive parasitic wiring components. A variety of resonant snubber circuit topologies with voltage clamping diodes are presented and demonstrated. As an example of the variations of the proposed auxiliary active resonant-commutation snubber topologies, operation of a single-IGBT bidirectional switch with two voltage clamping diodes is analysed and discussed in detail for the auxiliary resonant bridge-leg link snubbers. The operating performance of the new active auxiliary resonant snubber-associated inverter-fed DC to DC power converter with voltage clamping diodes is practically demonstrated and evaluated to verify its effectiveness for a high-power high-voltage x-ray generator. - Author(s): M. Veerachary ; T. Senjyu ; K. Uezato
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 6, p. 494 –502
- DOI: 10.1049/ip-epa:20010656
- Type: Article
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p.
494
–502
(9)
The photovoltaic generator exhibits nonlinear v–i characteristics and its maximum-power point varies with solar insolation. An interleaved dual boost converter is used to match the PV system to the load and to operate the solar cell array at maximum power point. A maximum power point tracking algorithm is developed using only load voltage information, eliminating array current detection. Analytical expressions for the PV array current and duty ratio of the converter corresponding to maximum power point operation of the solar cell array (SCA) are derived. SCA power output expressions with boost and interleaved dual boost converters are deduced. Load voltage based tracking effectiveness is demonstrated through simulation results. Experimental results validate the proposed method. Observations are also presented for partial shading conditions. The results obtained with this converter are compared with the boost converter PV system. It is demonstrated that the interleaved dual boost converter is more efficient and capable of reducing the ripple content in both source and load sides. As a result the interleaved dual boost converter photovoltaic systems require lower values of array input capacitance. SCA performance improves because of lower array ripple magnitudes. - Author(s): B.J. Kang and C.M. Liaw
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 6, p. 503 –512
- DOI: 10.1049/ip-epa:20010608
- Type: Article
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p.
503
–512
(10)
A robust hysteresis current-controlled PWM scheme is presented, having constant switching frequency for a single-phase inverter with a wide frequency range. An intuitive analysis for the harmonic spectrum characteristic of the hysteresis control PWM inverter is made prior to developing the proposed switching control approach. According to the operating frequency and load nature of inverter, the variation range of the hysteresis band for achieving the desired constant switching frequency is determined, and the hysteresis switching mechanism is devised. Next, the filter design, in accordance with the inverter output frequency feature and the load requirement, is described. In addition, a simple robust controller is proposed to improve the constant frequency control performance and thus to reduce the effect of inverter output harmonics on the load operating characteristics. The proposed hysteresis PWM scheme is applied to an inverter-fed electrodynamic shaker, and its effectiveness is verified by simulation and experimental results. - Author(s): M.C. Liew and P.S. Bodger
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 6, p. 513 –519
- DOI: 10.1049/ip-epa:20010587
- Type: Article
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p.
513
–519
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Equivalent circuit components are developed for a partial-core transformer using a new technique called reverse transformer design. Components requiring special consideration include the core-loss resistance, magnetising reactance and the winding leakage reactance. Three sample transformers were built and tested in order to verify and determine the equivalent circuit parameters. A fourth transformer was also designed, built and tested. The measured performance of the transformer confirmed the validity and accuracy of the model. - Author(s): G. Narayanan and V.T. Ranganathan
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 6, p. 521 –536
- DOI: 10.1049/ip-epa:20010611
- Type: Article
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p.
521
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(16)
An overmodulation algorithm is applied to four recently proposed space vector-based synchronised PWM strategies, to extend their range of operation and enhance the DC bus utilisation. The waveform symmetries and the proportionality between the reference magnitude and the fundamental voltage generated are also maintained in the overmodulation zone. It is shown that the relationship between the control variable and the fundamental voltage generated differs widely with the strategy and the pulse number used in low switching frequency PWM techniques unlike that at high switching frequencies. As a result the boundaries between any two consecutive zones of modulation and the maximum modulation index also vary with the strategy and the pulse number used. Cases where operation is possible up to the six-step mode are distinguished from those cases where it is not. The performance of the different strategies is evaluated. It is shown theoretically as well as experimentally that the bus-clamping PWM strategies perform better than the conventional space vector strategy in the overmodulation zone. - Author(s): M. Arkan ; D.K. Perović ; P. Unsworth
- Source: IEE Proceedings - Electric Power Applications, Volume 148, Issue 6, p. 537 –547
- DOI: 10.1049/ip-epa:20010588
- Type: Article
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p.
537
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(11)
This paper presents a noninvasive and online method for detection of stator winding faults in three-phase induction motors from observation of negative sequence supply current. A power decomposition technique (PDT) has been used to derive positive and negative sequence components of measured voltages and currents. A fault detection algorithm has been developed to characterise the effects of supply imbalance and nonlinear motor effects (motor iron saturation, winding imbalance, rotor static eccentricity), which also generate negative sequence current. The effects of motor heating and variation in negative sequence resistance with slip change are minimised by using only motor negative sequence reactance to calculate supply negative sequence current. Change in the motor negative sequence impedance under supply imbalance due to load variation (mainly because of closed rotor slots effect) has been included. Experimental results on several motors show that negative sequence impedance can vary between 10% to 50%. Semiempirical formulas based on theoretical and experimental results have been proposed to eliminate the effects of supply imbalance, load, and voltage variation. Compensation for this negative sequence current before making the fault decision enables a high fault sensitivity to be achieved.
Single-switch AC–AC converter with high power factor and soft commutation for induction heating applications
Zero-current switching fixed frequency resonant-transition square wave converters
Snubber circuit for diode-clamped four-level inverter and converter
Auxiliary resonant snubber bridge-leg associated soft-switching PWM inverter type DC-DC converter family with bidirectional active switches and voltage clamping diodes
Maximum power point tracking control of IDB converter supplied PV system
Robust hysteresis current-controlled PWM scheme with fixed switching frequency
Partial-core transformer design using reverse modelling techniques
Overmodulation algorithm for space vector modulated inverters and its application to low switching frequency PWM techniques
Online stator fault diagnosis in induction motors
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