Hybrid Harmonic Suppression Method at DC Link of Series-Connected 18-Pulse Rectifier

Round 1

Reviewer 1 Report

In the present paper, the authors propose a hybrid harmonic suppression method 18-pulse rectifier. The result shows that after using the proposed harmonic reduction method, the input side THD values of the converter are decrease from 5.8% to 2.7%. View from the results of this work, this paper deserves the publication to Applied Sciences with major revisions as below:
1.    Please replace figure 10 with high resolution pictures.
2.    There are no description about figure 15(b)、16(b) and 17(b). 

Author Response

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Reviewer 2 Report

Overall this is one very good scientific paper, I really like it.  It is written in very professional way. Despite the fact that I do not see some big or revolutionary scientific improvement, it look s very nice and covers any other possible lack.

Jus a few comments.

Fig.1. could be enlarged, a little bit. Not necessary for www-version, but important for printed version

Fig.2. same comment

Line 79, formula (proportion) is very long, it should be in separate line, centered.

Fig. 6 same as Fig.1 and Fig. 2.

Please check one more formulas in Table 1.

Insert one line between Table 1 and Fig.8

In section 4. formulas (23) and (24) are very big not clear enough. Please try to write them better and more concise.

I do not like formulas (19), (20) and (21). I do understand that they are large and very unusual, but please find some other more appropriate way to write it.

After You do it, there is no need for another reviewers check, I believe that authors will make efforts to do it best possible.

Author Response

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Reviewer 3 Report

This article uses phase shift transformer to suppress harmonics in three phase circuits, and also uses an injection circuit as a tool for actively control the circuit operation mode.

Line 7, 8 need to be completed.

Some terminology is not well defined in the article or figure, such as U_FP, U_ST etc.

The introduction section needs more grammer check.

According to line 96, if current Ix is directly calculated by formula (4) using currents (Irec) from figure 3, it is supposed to be more sinusoidal than that shown in figure 3. Perhaps, more proper wording needs to be used.

In line 113, figure 5 is supposed to derive from figure 4 and 6. Does it mean equation 6 ?

 

 

Author Response

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Reviewer 4 Report

In my opinion, the article is very interesting and carefully written. Despite this, I have comments to the Authors:
1. An interesting test would be to include oscillograms with a step change in the load current.
2. Does the change of the load current value significantly affect the level of generated harmonics?
Technical Notes:
1. Literature item [18] does not exist.
2. I suggest that the numbering of formulas in Appendix should be continued in accordance with the numbering in the article.

Author Response

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Author Response File: Author Response.docx

Round 2

Reviewer 1 Report

In the present paper, the authors propose a hybrid harmonic suppression method 18-pulse rectifier. The result shows that after using the proposed harmonic reduction method, the input side THD values of the converter are decrease from 5.8% to 2.7%. View from the results of this work, this paper deserves the publication to Applied Sciences.