Study on Boost Converters with High Power-Density for Hydrogen-Fuel-Cell Hybrid Railway System
Round 1
Reviewer 1 Report
The paper is well written describing all the aspects very well with enough details and descriptions. Experimental results validate the analysis and theoretical part. the abstract and conclusion summarized the paper properly. The introduction gave sufficient information about the tackled topic. The overall structure of the paper is well organized.
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Reviewer 2 Report
The authors present the results of their work on innovative DC / DC voltage boosting converters that are suitable for use in a hybrid hydrogen-fuel-cell system. The subject of the analysis were interleaving and 3-level converters increasing voltage applied to DC/DC converters. This article describes the operation principle of an interlaced and 3-level voltage boost converter. The work of this transducer was analyzed and the design of the induction coil, capacitor and power semiconductor of the device was proposed. Appropriate theoretical analyzes were presented. Theoretical analyzes have been experimentally verified. Based on the experimental results, the authors concluded that the proposed solution works correctly. The authors concluded that the three-level converter boosting voltage is a very promising solution for the hydrogen-cell hybrid fuel system. This is a better solution than an interlaced height converter due to its high efficiency and high power density. Concluding: authors presented an innovative DC/DC converters suitable for high-power density and light-weight to apply to the hydrogen-fuel-cell hybrid railway system. solution. In my opinion, the work presents an innovative converter solution and can be published in a form sent by the authors.
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Reviewer 3 Report
Authors present a conventional design on an interleaved boost dc/dc converter. The main point of interest is its high efficiency for such a high power level. I have the following comments:
1) Why do you refer explicitly to Hydrogen-Fuel-Cell Hybrid Railway System? the converter design and operation is regardless the power source and/or application.
2) The efficiency for such a hard switching device is too high to be true! For example, LLC converters at the same power level (employing SiC switches) have similar (a little lower in fact) efficiency! For this reason, I would like to see the detailed design of the inductor; at such high power levels and switching frequencies (60 kHz - hard switching) it should be a large inductor with high core and copper losses.
3) The converter pictures present some miniature inductors! Is this correct? and I can't see the cooling system of the power converter.
4) Please provide voltage and current waveforms across semiconductor switches.
Author Response
Thank you for your valuable comments.
Author Response File: Author Response.pdf
