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Novel soft-commutation DC-DC power converter with high-frequency transformer secondary side phase-shifted PWM active rectifier

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IEE PROCEEDINGS-ELECTRIC POWER APPLICATIONS 2004年第3期151卷 260-267页

作者： Moisseev, S Soshin, K Sato, S Gamage, L Nakaoka, M Yamaguchi Univ Grad Sch Sci & Engn Div Elect & Elect Syst Engn Yamaguchi Japan

This paper presents a novel circuit topology of the voltage source type zero voltage soft-switching (ZVS) full bridge DC-DC power converter with an isolated high-frequency transformer, which incorporates zero-current soft-switching (ZCS) phase-shifted (PS)-PWM active power switches in series with diodes of two bridge arms of a full-bridge rectifier on the high-frequency transformer secondary side. This high-frequency linked DC DC power converter can achieve ZVS for noncontrolled active power switches on the primary side of the transformer and ZCS for PS PWM active switches on the secondary side of the transfonner under wide load variations as well as a wide PS-PWM regulation range. The switching power losses and conduction power losses of the active devices of the proposed DC-DC converter can be considerably reduced. The proposed DC DC converter blocks circulating current flowing through the semiconductor switching devices on the transformer primary side as compared to the lossless snubbing capacitor and transformer leakage and magnetising inductor-assisted soft-switching full-bridge DC-DC converter with ZVS PS-PWM scheme on the transformer primary side. The steady-state operating principles of the proposed DC DC converter are evaluated and discussed, based on the simulation and experimental results obtained from a 2kW-40kHz breadboard set-up using IGBTs.

关键词： ELECTRIC circuits BRIDGE rectifiers pulse-width modulation ELECTRIC transformers CASCADE converters ELECTRONICS

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Multi-level discontinuous pulsewidth modulation: common mode voltage minimisation analysis

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IEE PROCEEDINGS-ELECTRIC POWER APPLICATIONS 2004年第4期151卷 477-486页

作者： Loh, PC Pang, GHH Holmes, DG Nanyang Technol Univ Ctr Adv Power Elect Singapore 2263 Singapore Def Sci & Technol Agcy Singapore Singapore Monash Univ Dept Elect & Comp Syst Engn Clayton Vic 3168 Australia

pulsewidth modulation (PWM) of power converters has been intensively researched for many years and is presently well established in two-level inverter modulation. Multi-level inverter modulation is, however, relatively more complicated because of the increased number of DC voltage levels and redundant switching states available. In this paper, the concept of equivalent null space vectors to link two-level and multi-level modulation is presented, and it is shown that proper placement of these equivalent null vectors can give rise to different multi-level discontinuous PWM strategies with both minimal generated common mode voltage and harmonic distortion. Other issues, such as the proper selection of clamping voltage levels and required zero sequence offsets for implementing these optimised discontinuous PWM strategies are also addressed. All PWM strategies presented have been verified by both simulation and experimental results.

关键词： pulse-width modulation pulse modulation (Electronics) CASCADE converters ELECTRIC current converters ELECTRIC power supplies to apparatus POWER electronics

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Position measurement using an enclosed signal field with pulse-width-modulated function

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SENSORS AND ACTUATORS A-PHYSICAL 2004年第1期113卷 54-59页

作者： Ohyama, S Iizuka, J Takayama, J Kobayashi, A Tokyo Inst Technol Grad Sch Sci & Engn Meguro Ku Tokyo 1528552 Japan

A novel pulse-width-modulated (PWM) function is introduced for precise position measurement in an enclosed signal field. An amplitude modulation was used to light the LEDs for the previous study. However, the transform properties from the driving signal to the lighting intensities of the LEDs are non-linear, and accurate control of the lighting power was necessary. Therefore, a lighting function independent of these properties is desired. Well-known PWM functions are used to construct the enclosed signal field by simulation, and the precision of the phase detecting system is analyzed. A novel axial symmetry PWM function is found to be effective for orthogonal phase detection. (C) 2004 Elsevier B.V. All rights reserved.

关键词： enclosed signal field pulse-width modulation position measurement

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Analysis of the voltage distribution in a motor stator winding subjected to steep-fronted surge voltages by means of a multiconductor lossy transmission line model

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IEEE TRANSACTIONS ON ENERGY CONVERSION 2004年第1期19卷 7-17页

作者： Petrarca, C Maffucci, A Tucci, V Vitelli, M Univ Naples Federico II Dipartimento Ingn Elettr I-80125 Naples Italy Univ Cassino DAEIMI I-03043 Cassino FR Italy Univ Salerno Dip Ing Ing Inform & Ing Elettr I-84084 Fisciano SA Italy Univ Naples 2 Dip Ing Dell Inform I-81031 Aversa CE Italy

In this paper, the effect of steep-fronted voltage waveshapes infringing on a pulse-width-modulated (PWM) inverter fed induction motor is studied. The system, composed of a feeder cable and a stator winding, is modeled and simulated by using multiconductor transmission line theory in order to predict the voltage distribution among the coils of the stator winding. A recently developed time-domain equivalent circuit is used;it allows one to correctly describe the dielectric losses and the skin-effect in the conductors. The relationship among the voltage distribution inside the electrical insulation and parameters like the rise time of the applied voltage, the cable length, and the distributed losses is deeply discussed. Good agreement has been found among experimental and numerical results.

关键词： AC motors electrical insulation pulse-width modulation windings

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Single-phase half-bridge rectifier with power factor correction

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IEE PROCEEDINGS-ELECTRIC POWER APPLICATIONS 2004年第4期151卷 443-450页

作者： Lin, BR Yang, TY Natl Yunlin Univ Sci & Technol Dept Elect Engn Power Elect Res Lab Touliu 640 Yunlin Taiwan

A single-phase half-bridge switching mode rectifier is presented to draw a sinusoidal line current, to achieve power factor correction and to maintain the DC-link voltage constant. Four active switches are used in the proposed rectifier to generate a unipolar pulse width modulation (PWM) voltage waveform on the AC terminal voltage. There is no clamping diode in the proposed rectifier (as compared with the neutral point clamped (NPC) converter) so as to achieve three-level PWM operation. Two control loops are used in the proposed control scheme. In the outer control loop, a proportional integral voltage controller is used to regulate the DC-link voltage. A phase lock loop circuit is adopted to generate a sinusoidal waveform in phase with mains voltage to achieve power factor correction. In the inner control loop, a carrier-based current controller is used to track the line current command. To compensate the neutral point voltage due to the load variation, a neutral point voltage compensator is used in the control scheme. Three voltage levels are generated on the AC terminal of the adopted rectifier. Computer simulations and experimental results are presented to verify the effectiveness of the proposed control algorithm.

关键词： BRIDGE rectifiers ELECTRIC current rectifiers BRIDGE circuits ELECTRIC switchgear pulse-width modulation VOLTAGE-clamp techniques (Electrophysiology)

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A novel modulation technique for a single phase H-bridge inverter

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INTERNATIONAL JOURNAL OF ELECTRONICS 2004年第1期91卷 41-55页

作者： Dehbonei, H Nayar, CV Borle, L Curtin Univ Technol Ctr Renewable & Sustainable Technol Australia Perth WA 6845 Australia Univ Western Australia Dept Elect & Comp Engn Crawley WA 6009 Australia

In this paper a novel space vector modulation method for single-phase inverters is presented. Mathematical analysis, simulation and comparison of conventional sinusoidal pulse width modulation (SPWM) techniques with the proposed space vector modulation for single-phase inverter are included. These modulation techniques are compared, evaluated and classified for different single-phase applications, including deadband effects. The proposed modulation method combines the flexibility of the well-known unipolar PWM scheme for single-phase inverters result in maximum harmonic mitigation. The new technique is suitable for simple digital implementation. Experimental results, obtained by a digital signal processor (DSP) board, are included.

关键词： ELECTRIC inverters modulation (Electronics) MATHEMATICAL analysis pulse-width modulation DIGITAL signal processing HARMONIC analysis (Mathematics)

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Unified design for ZVT PWM converters with resonant auxiliary circuit

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IEE PROCEEDINGS-ELECTRIC POWER APPLICATIONS 2004年第3期151卷 303-312页

作者： Martins, ML Russi, JL Pinheiro, H Pinheiro, JR Gründling, HA Hey, HL Univ Fed Santa Maria Power Elect & Control Res Grp BR-97105900 Santa Maria RS Brazil

Operation modes of zero-voltage transition (ZVT) PWM converters with resonant auxiliary circuit (RAC) are identified and analysed by means of a common topology. A novel state-plane approach is used to determine the soft-switching boundary for this sort of converter. A unified design criterion, based on the analytical definition of the soft-switching boundary, is described in detail. By means of the proposed criterion the time spent on repetitive numerical simulation of a given topology to define its design guidelines based on a set of particular features can be significantly reduced. The theoretical analysis is confirmed by means of experimental results obtained from ZVT-PWM boost converters, which operate at 1 kW, 100 kHz.

关键词： pulse-width modulation CASCADE converters ELECTRIC current converters pulse modulation (Electronics) ELECTRONICS

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Operation of the dynamic voltage restorer with fuzzy logic control

Operation of the dynamic voltage restorer with fuzzy logic c...

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4th International Power Electronics and Motion Control Conference (IPEMC 2004)

作者： Jurado, F Valverde, M Univ Jaen Dept Elect Engn Linares Jaen Spain

ISBN: (纸本)7560518699

Dynamic voltage restorer can provide the most cost effective solution to mitigate voltage sags by establishing the proper voltage quality level that is required by customer. This device is connected in series with the distribution feeder at medium voltage. A fuzzy logic control is proposed. As is known, the PWM converter is actually non-linear, but the PI is a linear controller, so it can only guarantee the stability of this converter in a local area. Simulation results are shown to validate these control methods.

关键词： inverter IGBT power quality pulse-width modulation voltage sag

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Harmonic Elimination for Constrained Optimal PWM

Harmonic Elimination for Constrained Optimal PWM

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30th Annual Conference of the IEEE-Industrial-Electronics-Society (IECON)

作者： Huang, Han Hu, Shiyan Czarkowski, Dariusz Polytech Univ Dept Elect & Comp Engn Brooklyn NY 11201 USA

ISBN: (纸本)9780780387300

The Selected Harmonic Elimination (SHE) pulse-width modulation (PWM) inverter eliminates low-order harmonics by optimizing the distribution of switching angles and can generate high quality output waveforms. The goal of optimal SHE-PWM is to select the switching instances (angles) in such a way that a waveform with a particular characteristic is obtained and a certain criterion is minimized. To keep the results realizable in hardware, it is required that the computed consecutive switching angles are sufficiently distant from each other. This well-separation feature is not controlled by classical SHE-PWM algorithms. In this paper, a new algorithm is proposed to solve the SHE-PWM problem with a constraint that any two consecutive solutions are well separated. The algorithm first transforms the problem into a constrained optimization problem, then uses the Differential Evolution (DE) algorithm to find the roots with the necessary distance of separation. Since the obtained switching angles are reasonably distant from each other, the inverter switches have enough time to operate and can properly finish the switching transitions. Essentially, the proposed method computes the best possible tradeoff between the maximum error for system performance and the minimum distance between consecutive switching angles under certain constraints and it is robust.

关键词： Harmonic elimination pulse-width modulation Differential evolution Well-separated switching instances Transcendental equations

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Optimal Bus-Clamped PWM Techniques for Three-phase Motor Drives

Optimal Bus-Clamped PWM Techniques for Three-phase Motor Dri...

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30th Annual Conference of the IEEE-Industrial-Electronics-Society (IECON)

作者： Lai, Yen-Shin Bowes, Sidney R. Natl Taipei Univ Technol Dept Elect Engn Taipei Taiwan

ISBN: (纸本)9780780387300

This paper presents optimal bus-clamped pulse-width modulation (PWM) techniques for three-phase motor drives. The techniques are developed from the viewpoint of per-phase modulation by minimizing the Switching Loss Factor (SLF) [I] which reflects the inverter switching losses. It will be shown that the new optimal bus-clamped PWM techniques dramatically reduce the switching losses and have the minimum switching loss factor in comparison with other existing techniques. Experiment results will be presented to confirm the theoretical analysis.

关键词： Space vector modulation pulse-width modulation motor drives

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