Medium frequency transformer for railway traction: Soft switching converter with high voltage semi-conductors

Martin, J.A.; Ladoux, Philippe; Chauchat, Bertrand; Casarin, J.; Nicolau, Sebastien

doi:10.1109/speedham.2008.4581221

Cited by 20 publications

(3 citation statements)

References 6 publications

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“…The topology of each elementary converter is given in figure 9. The voltage source inverter is composed of switches with spontaneous turn-on at zero voltage crossing and controlled turnoff while the current source inverter is composed of switches with spontaneous turn-off at zero current crossing and controlled turn-on [11]. The use of high voltage semiconductors enables to minimize the number of stages.…”

Section: Direct Ac/dc Converter With Medium Frequency Linkmentioning

confidence: 99%

“…In order to evaluate the switching losses, a test bench, based on the circuit of figure 9, was carried out. A first evaluation of 6.5 kV Si IGBT modules was performed [11]. Thus, assuming 1kW as the maximum dissipated power per module, the switching frequency has to be limited to 2 kHz in snubberless operation.…”

Section: Direct Ac/dc Converter With Medium Frequency Linkmentioning

confidence: 99%

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Outlook for SiC devices in traction converters

Ladoux

Mermet

Casarin

et al. 2012

2012 Electrical Systems for Aircraft, Railway and Ship Propulsion

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Silicon (Si) IGBTs are widely used in railway traction converters. In the near future, Silicon Carbide (SiC) technology will push the limits of switching devices in the three directions: higher blocking voltage, higher operating temperature and higher switching speed. All in all, these large-gap components should improve the traction chain efficiency and the power-weight ratio. Thus, the topology of the traction converter should be reconsidered from the input stage to the inverter including the DC bus. In this paper, the authors show the prospects for developments in traction voltage source inverters and active front end converters.

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Section: Direct Ac/dc Converter With Medium Frequency Linkmentioning

confidence: 99%

Section: Direct Ac/dc Converter With Medium Frequency Linkmentioning

confidence: 99%

Outlook for SiC devices in traction converters

Ladoux

Mermet

Casarin

et al. 2012

2012 Electrical Systems for Aircraft, Railway and Ship Propulsion

Self Cite

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show abstract

“…Possible technologies include conventional switch-mode type power supplies (generally limited to low stepping ratio) [6], [2], mediumfrequency transformer based designs [3], [7][8][9], and resonant converters [5], [10]. Despite the large number of markets for DC-DC converters, no technology has achieved widespread application and there is currently a need for further work both in conceptual design and modeling, as well as in practical testing.…”

Section: Introductionmentioning

confidence: 99%

30 kW, 200 V/900 V, Thyristor LCL DC/DC Converter Laboratory Prototype Design and Testing

Hajian

Robinson

Jovcic

et al. 2014

IEEE Trans. Power Electron.

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Abstract--This paper details design, development and testing of a prototype 30kW, 200V/900V resonant DC/DC converter. The converter achieves stepping ratio of 4.5 without internal AC transformer, and is capable of bidirectional DC power flow as well as fast DC power reversal. Very importantly, it has capability of DC fault isolation on either side, which is of extreme importance for high-power DC applications. The design and selection of the individual passive and active components is presented. A 30kW test setup including one 900V voltage source converter (VSC), one 200V VSC, and one 200V current source converter (CSC) are designed and built to provide a suitable test rig for prototype DC/DC converter. The analytical studies of efficiency are compared with the detailed converter measured efficiency. The prototype shows overall efficiency of around 92% at full power and weight of around 32kg, which is promising for scaling to high power applications. The converter operation at full power in step up mode as well as step down mode, and fast power reversal when connected to CSC on its low voltage side, are demonstrated by experimental results. Severe pole-to-pole DC faults are applied on 900V and 200V DC terminals and the inherent DC fault isolation capability is confirmed.

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