Application of Matrix VFD for Power Factor Improvement in LED Lighting Sources Loaded Power Distribution Lines
Round 1
Reviewer 1 Report
The abstract should be short and concise in one paragraph. Please check with the journal guideline with word limit.
This sentence can be grammatically improved: “This could solve the problem of LED device-generated reactive power compensation, and make it possible to cancel the application of the large capacitor banks equipped compensation devices.”
The contribution and gap in knowledge are not clear. In particular, not many literatures are reviewed in particular the recent development in the discussed area.
Define all acronyms, such as LED.
The equations are not process with an equation editor. They are highly pixelated.
The journal article should present advanced information and content. At present, the content focuses on undergraduate knowledge, for example power factor calculation (Eq. 6), phase and line voltage (Eq. 31).
Figures are poorly presented, and majority are cropped/incomplete. For example, Figure 5 blue sine wave.
Comparison with state of the art methods should be given.
Author Response
Reviewer 's note 1. The abstract should be short and concise in one paragraph. Please check with the journal guideline with word limit.
Reply to the note 1.
Dear reviewer. I shortened the abstract and fitted it in one paragraph.
Reviewer 's note 2. This sentence can be grammatically improved: “This could solve the problem of LED device-generated reactive power compensation, and make it possible to cancel the application of the large capacitor banks equipped compensation devices.”
Reply to the note 2.
Dear reviewer. I have corrected this sentence grammatically, splitting it into two parts for clarity. I also moved it to the introduction section because it helped to articulate the objectives of this study more clearly.
Reviewer 's note 3. The contribution and gap in knowledge are not clear. In particular, not many literatures are reviewed in particular the recent development in the discussed area.
Reply to the note 3.
Dear reviewer. I have updated the references and supplemented the review of publications with newly published research. I have clarified and reformulated the purpose of this study.
Reviewer 's note 4. Define all acronyms, such as LED.
Reply to the note 4.
Dear reviewer. I defined all the acronyms, including LED.
Reviewer 's note 5. The equations are not process with an equation editor. They are highly pixelated.
Reply to the note 5.
Dear reviewer. I re-edited all the equations with the equation editor. I also try to avoid distortions of equations and figures when converting manuscript to PDF.
Reviewer 's note 6. The journal article should present advanced information and content. At present, the content focuses on undergraduate knowledge, for example power factor calculation (Eq. 6), phase and line voltage (Eq. 31).
Reply to the note 6.
Dear reviewer. Based on this note from you, I have changed some of the equations by presenting the information in a different way.
Reviewer 's note 7. Figures are poorly presented, and majority are cropped/incomplete. For example, Figure 5 blue sine wave.
Reply to the note 7.
Dear reviewer. I re-edited must of the figures. I also try to avoid distortions of equations and figures when converting manuscript to PDF.
Reviewer 's note 8. Comparison with state of the art methods should be given.
Reply to the note 8.
Dear reviewer. I have updated the references and supplemented the review of publications with newly published research. I have presented aspects of these newly published studies that distinguish the novelty of our proposed compensation method.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
The given article treats an actual problem (power factor improvement methods for LED lighting sources loaded power distribution lines). The paper focuses on the method allowing to extend the compensation range of matrix-converter-based variable frequency drive. The title of the article is appropriate for the content. The abstract is concise and summarizes all essential information. The reference list consists of 19 scientific works. Unfortunately, it should be noted that the reference list is not relevant. There are many old works. The authors formulated the research question in lines 85-89. The aim of the article is not formulated precisely and needs to be clarified.
The points in the article which needs clarification and suggestions for what could be done to improve the article:
1. Explaining the effect of harmonics on the power factor the authors discuss a lot of well-known equations (lines 95-108). If they think that those equations are necessary (to meet the aim of the article) they should explain all values.
2. The authors must explain all values in equations (11)-14.
3. Figures 1-5, 10,13 are presented in a non-appropriate way. Figures 1, 4 ,6,10,13 are not suitable because the reader can not see full figures (maybe there are some problems with formatting). In figures 2,3,6,11,12 there are no axes titles.
4. It's better to clarify switch combinations (line 300)
5. There is no discussion section in the text of the article.
6. The works 4-9,11, 13,14,16, 18 in the reference list are too old.
7. It's highly recommended to make a spell check of the text.
Author Response
Reviewer 's note. The given article treats an actual problem (power factor improvement methods for LED lighting sources loaded power distribution lines). The paper focuses on the method allowing to extend the compensation range of matrix-converter-based variable frequency drive. The title of the article is appropriate for the content. The abstract is concise and summarizes all essential information. The reference list consists of 19 scientific works. Unfortunately, it should be noted that the reference list is not relevant. There are many old works. The authors formulated the research question in lines 85-89. The aim of the article is not formulated precisely and needs to be clarified.
Reply to the note.
Dear reviewer. I have clarified and reformulated the aim of this article. I have presented it at the end of the introduction section.
Reviewer 's note 1. Explaining the effect of harmonics on the power factor the authors discuss a lot of well-known equations (lines 95-108). If they think that those equations are necessary (to meet the aim of the article) they should explain all values.
Reply to the note 1.
Dear reviewer. Based on this note from you, I have changed some of the well-known equations by presenting the information in a different way.
Reviewer 's note 2. The authors must explain all values in equations (11)-14.
Reply to the note 2.
Dear reviewer. I explained the values in equations (11-14).
Reviewer 's note 3. Figures 1-5, 10,13 are presented in a non-appropriate way. Figures 1, 4 ,6,10,13 are not suitable because the reader can not see full figures (maybe there are some problems with formatting). In figures 2,3,6,11,12 there are no axes titles.
Reply to the note 3.
Dear reviewer. I re-edited must of the figures. I also try to avoid distortions of equations and figures when converting manuscript to PDF.
Reviewer 's note 4. It's better to clarify switch combinations (line 300) Papildysiu aš
Reply to the note 4.
Dear reviewer. I explained the switch combinations in more detail by supplementing this section with explanatory text, graphical interpretation of switcher’s combination selection algorithm (Figure 9), bidirectional switches combination logic (Table 2), and DC voltages formed by VSR stage (Figure 10).
Reviewer 's note 5. There is no discussion section in the text of the article.
Reply to the note 5.
Dear reviewer. I supplemented the manuscript in the Discussion section, in which I highlighted the advantages and benefits of this reactive power compensation method. I also described the planned future research on this topic.
Reviewer 's note 6. The works 4-9,11, 13,14,16, 18 in the reference list are too old.
Reply to the note 6.
Dear reviewer. I have updated the references based on your comment, with the exception of the publication [5], as this is one of the most recent studies on reactive power compensation by permanent magnet machine powered by a MC. I supplemented the review of publications with newly published studies.
Reviewer 's note 7. It's highly recommended to make a spell check of the text.
Reply to the note 7.
Dear reviewer. I made the spell check of the text.
Author Response File: Author Response.pdf
Reviewer 3 Report
1- The equations are not readable
2- Some figures are croped out.
3- The references are not enough and not strong.
Author Response
Reviewer 's note 1. The equations are not readable
Reply to the note 1.
Dear reviewer. I re-edited all the equations with the equation editor. I also try to avoid distortions of equations and figures when converting manuscript to PDF.
Reviewer 's note 2. Some figures are croped out.
Reply to the note 2.
Dear reviewer. I re-edited must of the figures. I also try to avoid distortions of equations and figures when converting manuscript to PDF.
Reviewer 's note 3. - The references are not enough and not strong.
Reply to the note 3.
Dear reviewer. I have updated the references and supplemented the review of publications with newly published research.
Author Response File: Author Response.pdf
Reviewer 4 Report
The paper is very good structured and it can being see the authors study the references and they come with new ideas for research.
The mathematical formulas are a great support in the research paper and the Matlab/Simulink model of the LED provide the first step in the verification of the method proposed.
It will be good like the method to be verified also with experimental results, don't remain only in simulation mode.
The problem that I see on paper and need to be changed is regarding the figures, which appear in the papers and there aren't in the right format I suppose, some of them are cut from the real dimension.
Author Response
Reviewer 's note 1. The paper is very good structured and it can being see the authors study the references and they come with new ideas for research.
Reviewer 's note 2.The mathematical formulas are a great support in the research paper and the Matlab/Simulink model of the LED provide the first step in the verification of the method proposed.
Reviewer 's note 3. It will be good like the method to be verified also with experimental results, don't remain only in simulation mode.
Reply to the note 3.
Dear reviewer. The large LED wall screen, the reactive power generated by which was measured experimentally, is constantly used commercially in the sports arena. The arena manager does not give permission to connect experimental compensation devices to the power distribution line of arena. This is due to the possibility that experimentation may interfere with the operation of this commercial LED wall screen. Therefore, it is not possible to perform the experimental verification and simulation with a reliable Matlab / Simulink model was performed.
Reviewer 's note 4. The problem that I see on paper and need to be changed is regarding the figures, which appear in the papers and there aren't in the right format I suppose, some of them are cut from the real dimension. Pataissysiu aš
Reply to the note 4.
Dear reviewer. I re-edited all the equations with the equation editor. Also I re-edited must of the figures. I also try to avoid distortions of equations and figures when converting manuscript to PDF.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
The authors provided a response letter aimed to address the comments. However, the changes are not implemented in the manuscript. The track version should also be provided.
Author Response
Dear reviewer. I provided the track changes in my manuscript.
Author Response File: 
Author Response.docx
Reviewer 2 Report
Unfortunately, it should be noted that the 2nd version of the article (file energies-1217318-peer-review-v2.pdf) is similar to the previous one. This fact may be caused by error during uploading of the file. None of my comments from the previous review were taken into account. Kindly ask authors to provide the revised paper.
Author Response
Dear reviewer. I provided the track changes in my manuscript. All the comments from the previous review are taken in to account. I uploading MS word format file (Manuscript energies-1217318 revised with track changes.docx).
Author Response File: Author Response.docx
Reviewer 3 Report
can you please improve the quality of the figures and equations, as well as the references
Author Response
Dear reviewer. I re-edited the figures and equations. I have updated the references and supplemented the review of publications with newly published research. I also try to avoid distortions of equations and figures when converting manuscript to PDF. Because of this I uploading MS word format file.
Author Response File: Author Response.docx
Round 3
Reviewer 1 Report
The authors have made a revision to the manuscript. The comments are as follows:
The abstract can provide quantitative findings. What is the significance of power factor improvement and how by much as compared to state-of-the-art?
Section 6 Conclusion should be the last, not Section 7 Discussions.
English must be improved. For example, back to back should be back-to-back, change at the same time to simultaneously. Correct “In further research is planned to investigate” Line 1160 there should be a space between limitedwhen.
Author Response
Reviewer's note 1. The abstract can provide quantitative findings. What is the significance of power factor improvement and how by much as compared to state-of-the-art?
Reply to the note 1.
Dear reviewer. Using our proposed compensation method, the power factor can be kept close to 1, as the power factor of LED lighting devices is in the range of 0.49 to 0.6. I mentioned these quantitative values in addition to the abstract. In the Introduction section, we reviewed state-of-the-art compensation methods. These methods involve the installation of additional equipment and additional costs. Our proposed method does not require additional equipment installation and additional costs. We propose to use MC-based AC drives for reactive power compensation, simultaneously, performing their primary function of motor powering and speed control. Quantitative comparison of these state-of-the-art compensation methods reviewed with our proposed method would not be correct.
Reviewer’s note 2. Section 6 Conclusion should be the last, not Section 7 Discussions.
Reply to the note 2.
Dear reviewer. I moved the Discussion section to position 6, the Conclusions section became the last.
Reviewer’s note 3. English must be improved. For example, back to back should be back-to-back, change at the same time to simultaneously. Correct “In further research is planned to investigate” Line 1160 there should be a space between limitedwhen.
Reply to the note 3.
Dear reviewer. I improved my English by changing back to back to back-to-back throughout the text of the article. I also changed the change "at the same time" to "simultaneously". I also changed "In further research is planned to investigate" to "In further research we plan to investigate". I changed "limitedwhen" to "limited when".
Author Response File: Author Response.pdf
Reviewer 2 Report
Thanks to the authors of the article for the detailed explanation of all issues concerning the comments. All data now are presented clearly, the figures are not distorted. The paper can be accepted for publication.
Author Response
Thank you
