A Three-Phase Soft-Switched Isolated AC/DC Converter Without Auxiliary Circuit

Norrga, Staffan; Meier, Stephan; Östlund, Stefan

doi:10.1109/tia.2008.921430

Cited by 53 publications

(25 citation statements)

References 6 publications

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“…At the AC side, the voltage across the winding is in proportion to that at the DC side. The IGBTs in the three phase bridge switch to achieve voltage required by the power to be transmitted according to the PWM strategy [3,4]. The converter has the ability of bidirectional power flow control.…”

Section: Topology and Principle Of High Frequency Isolated Interconnementioning

confidence: 99%

“…The magnetic core in the converter works in double end mode, which means high efficiency in utilizing the crossing area of core but potential risk of core saturation simultaneously due to the flux bias. Reference [4] discussed the flux bias issue but didn't propose an effective solution for it. This paper researches the issue of the flux bias of the magnetic core in the interconnection converter in detail and is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

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Research on Reduction of Magnetic Flux Bias in High Frequency Isolated Interconnection Converter for AC/DC Hybrid Microgrid

Xue¹,

Tian²

2017

dteees

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Abstract. An essential issue of the high-frequency isolated converter interconnecting the AC/DC hybrid microgrid is the magnetic flux bias, which will cause saturation of magnetic core if not controlled appropriately. In order to solve the problem, this paper analyzes the reasons of the flux bias and models the magnetizing current in the s-domain. Based on the analysis and the model, a strategy for magnetic flux bias reduction is proposed. The strategy compares the peak of the magnetizing current at each switching time and controls the average of the magnetizing current to zero by applying an additional voltage to the winding of the transformer at the DC side. The simulation base on PSIM platform is implemented and the results verify the validity of the proposed strategy.

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Section: Topology and Principle Of High Frequency Isolated Interconnementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on Reduction of Magnetic Flux Bias in High Frequency Isolated Interconnection Converter for AC/DC Hybrid Microgrid

Xue¹,

Tian²

2017

dteees

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“…By alternately commutating the VSC and the cycloconverter, it is almost always possible to naturally commutate the cycloconverter phase legs [4], i.e. generally, the cycloconverter valves do not need any turn-off capability.…”

Section: Cycloconverter Control Strategiesmentioning

confidence: 99%

“…Fig. 4 shows typical voltage and current waveforms during a commutation sequence for a cycloconverter equipped with IGBTs, refer to [4]. Assuming that the FSM of the third cycloconverter phase leg is in the state 1P after the VSC commutation, the case occurs where the output current is changing sign before the corresponding phase leg commutation.…”

Section: ) 1p -2n -2p -1nmentioning

confidence: 99%

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Control strategies for mutually commutated converter systems without cycloconverter turn-off capability

Meier

Norrga

Nee

2008

2008 IEEE Power Electronics Specialists Conference

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Mutually commutated converter systems consisting of a voltage source converter and a cycloconverter connected by a medium-frequency transformer allow bidirectional AC/DC conversion as well as voltage transformation and isolation by the transformer. However, such converter systems require an extra power conversion stage compared to conventional converter systems, which may result in low system efficiency despite the soft-switching commutation scheme. In order to reduce the power losses in the cycloconverter, it is desirable to utilize fast thyristors instead of IGBTs. As a consequence, the cycloconverter valves lack turn-off capability because a thyristor can not be turned off by its gate. This paper describes and evaluates the most common control strategies in order to control a thyristor-based cycloconverter in a mutually commutated converter system. The behaviour of the cycloconverter depends strongly on the chosen control strategy when one of the output currents approaches zero, which may inherently affect the harmonic properties of the output voltages and currents. Experimental results from a 20 kVA prototype show that it is possible to successfully operate a mutually commutated converter system without turn-off capability.

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Battery charging topology, infrastructure, and standards for electric vehicle applications: A comprehensive review

Kumar

Usman

Rajpurohit

2021

IET Energy Syst Integration

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The proposed study reports the essential parameters required for the battery charging schemes deployed for Electric Vehicle (EV) applications. Due to efficient power delivery, cost-effectiveness, and environmental acclimation, EVs have emerged as a suitable alternative to the Internal Combustion (IC)-based engines. However, prominent challenges for leveraging the EVs are the suitable availability of battery charging infrastructure for high energy/power density battery packs and efficient charging topologies. Despite the challenges, EVs are gradually being implemented across the globe to avoid oil dependency, which currently has a 5%-7% decline rate of post-peak production. The vast deployment of EVs as private and commercial vehicles has created a major challenge for the grids in maintaining the power quality and peak load demand. This study, therefore, reviews the various battery charging schemes (battery charger) and their impact when used in EV and Hybrid EVapplications. The available constituents of the battery chargers such as ac-dc/dcdc converter topologies, modulations, and control techniques are illustrated in detail. The comprehensive study classifies the charging topologies depending upon the power and charging level. Some appropriate battery charging converter topologies that are suitable for domestic, industrial, and commercial applications like EVs are suggested in the study. In addition, a decision-making inference is developed through a flow chart that decides on the suitable selection of the converter topology based on the required applications. Furthermore, the charging infrastructures along with the converters' design standards are also discussed concisely, which adds a significant contribution to the review article. K E Y W O R D SAC-DC power converter, battery charger, charging station, DC-DC power converters, electric vehicle (EV), hybrid electric vehicle (HEV)This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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A Three-Phase Soft-Switched Isolated AC/DC Converter Without Auxiliary Circuit

Cited by 53 publications

References 6 publications

Research on Reduction of Magnetic Flux Bias in High Frequency Isolated Interconnection Converter for AC/DC Hybrid Microgrid

Research on Reduction of Magnetic Flux Bias in High Frequency Isolated Interconnection Converter for AC/DC Hybrid Microgrid

Control strategies for mutually commutated converter systems without cycloconverter turn-off capability

Battery charging topology, infrastructure, and standards for electric vehicle applications: A comprehensive review

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