Impedance Modeling and Stability Analysis for Cascade System of Three-Phase PWM Rectifier and LLC Resonant Converter

Round 1

Reviewer 1 Report

Fig. 12 isn't shown clear. 

It is not shown in the figure 13 that what exactly happened at 0.15s and 0.25s.

Paper named, “Impedance modeling and stability analysis of three-phase balanced PWM rectifier and LLC resonant converter” is interesting in topics of filters and stability analysis.

Reference [15] should be after reference 14 in the introduction.

The references are so outdated. Please refer to references that are published after 2010 for example.

The introduction part is not complete. It is better to mention each reference and what you want to discuss about separately and extend the introduction.

In Eq. 3, what is Uno? Also, Eq. 3 is incorrect, because it is told that Uga = .. + Uga which is not correct according to figure3.

There is no Fig 2-1. Correct it.

Please specify every items used in equations. In Eq. 6, what are w and D?

It is not shown in the figure 13 that what exactly happened at 0.15s and 0.25s.

You can refer to some other methods of stability analysis that consider A matrix an eigenvalues to check the stability. For example you can see and refer to this paper: “Control Hardware-in-the-Loop Demonstration of a Building-Scale DC Microgrid Utilizing Distributed Control Algorithm”

There is no figure 3-2. Also, if you have multiple figures in a figure, you should have a,b,c for them to refer easily.

The quality of pictures are not good, especially figures of nyquist and bode plot.

Author Response

Dear Editor and Reviewers,

Thank you for considering again for this paper (energies-383939) and proposing revise opinion to us. In this paper, some problems do exist, and we have made serious modification to the proposed issues.

For the revised part of the paper, we have highlighted with the yellow background.

We are concerned about the formatting errors due to the differences in Word versions, which can influence the reading. So we uploaded both the Word documents and the PDF documents.

We greatly appreciate both your help and that of the referees concerning improvement to this paper. If there are still any questions or suggestions, please inform us, we will revise the manuscript and reply as soon as possible.

If you have any question about this paper, please don’t hesitate to contact us.

 

Yours sincerely,

 

Prof. Rutian Wang

Author Response File: Author Response.pdf

Reviewer 2 Report

The paper presents a modeling in Matlab/Simulink of PWM rectifier and LLC resonant converter cascade system.

The manuscript should be carefully reviewed according to the Energies template (especially the tables and figures).

Figures 13 and 16 should provide more details. Presentation in this form is incomplete.

Conclusions should be reworked: they should refer directly to the results presented.

The practical utility of simulation must be highlighted.

Literature review is poor (the papers cited are published before 2014).

Author Response

Dear Editor and Reviewers,

Thank you for considering again for this paper (energies-383939) and proposing revise opinion to us. In this paper, some problems do exist, and we have made serious modification to the proposed issues.

For the revised part of the paper, we have highlighted with the yellow background.

We are concerned about the formatting errors due to the differences in Word versions, which can influence the reading. So we uploaded both the Word documents and the PDF documents.

We greatly appreciate both your help and that of the referees concerning improvement to this paper. If there are still any questions or suggestions, please inform us, we will revise the manuscript and reply as soon as possible.

If you have any question about this paper, please don’t hesitate to contact us.

 

Yours sincerely,

 

Prof. Rutian Wang

Author Response File: Author Response.pdf

Reviewer 3 Report

paper named "Impedance modeling and stability analysis of three-phase balanced PWM rectifier and LLC resonant converter" is interesting, but bad written, there are a lot of doubs reading it.

there is no numbering of lines, it is hard to correct it

abstract

"Nyquist curve is not round", use arund.

Introduction

reference [15] is before [11-14], correct it

sometimes the dot is linked not to the last word but to the first of the new sentence.

Figure 2-1, check it

use Figure, not figure

section 3

check Figure 3, not Figure3

Formula 3, uga is used badly, twice, check it

remove gotten, use given

equation 6, D and I are not discussed.

Can the small signal analysis  be used for sinusoidal system? Use a good reference.

Check Figure 3-2

From Figure 5 to formula 12, Gi and Go are not discussed

  

Author Response

Dear Editor and Reviewers,

Thank you for considering again for this paper (energies-383939) and proposing revise opinion to us. In this paper, some problems do exist, and we have made serious modification to the proposed issues.

For the revised part of the paper, we have highlighted with the yellow background.

We are concerned about the formatting errors due to the differences in Word versions, which can influence the reading. So we uploaded both the Word documents and the PDF documents.

We greatly appreciate both your help and that of the referees concerning improvement to this paper. If there are still any questions or suggestions, please inform us, we will revise the manuscript and reply as soon as possible.

If you have any question about this paper, please don’t hesitate to contact us.

 

Yours sincerely,

 

Prof. Rutian Wang

Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

The abstract has a lot of grammer issues. Please revise it. It is not readable.

Where is Uno? As mentioned earlier, all of parameters should be defined and shown in the figure.  

In Fig. 13 and 16, It is better that figures have axis names. 

Author Response

Response

Dear Editor and Reviewers,

Thank you for considering again for this paper (Energies-383939) and proposing revise opinion to us. In this paper, we have made serious modification to the proposed issues.

In the paper, for the modified text, we have highlighted with the blue background.

We are concerned about the formatting errors due to the differences in Word versions, which can influence the reading. So we uploaded both the Word documents and the PDF documents.

We greatly appreciate both your help and that of the referees concerning improvement to this paper. If there are still any questions or suggestions, please inform us, we will revise the manuscript and reply as soon as possible.

 

If you have any question about this paper, please don’t hesitate to contact us.

 

Yours sincerely,

 

Prof. Rutian Wang

Author Response File: Author Response.pdf

Reviewer 2 Report

My comments have been addressed.

Author Response

Response

Dear Editor and Reviewers,

Thank you for considering again for this paper (Energies-383939) and proposing revise opinion to us. In this paper, we have made serious modification to the proposed issues.

In the paper, for the modified text, we have highlighted with the blue background.

We are concerned about the formatting errors due to the differences in Word versions, which can influence the reading. So we uploaded both the Word documents and the PDF documents.

We greatly appreciate both your help and that of the referees concerning improvement to this paper. If there are still any questions or suggestions, please inform us, we will revise the manuscript and reply as soon as possible.

 

If you have any question about this paper, please don’t hesitate to contact us.

 

Yours sincerely,

 

Prof. Rutian Wang

Author Response File: Author Response.pdf

Reviewer 3 Report

authors did a good job to improve their article. 

check the title, some word are separated.

I found a further problem in the references, there are no references for Energies journal.

I would ask the authors to insert at least three recent Energies articles, one could be as follows:

Miceli, R.; Schettino, G.; Viola, F. A Novel Computational Approach for Harmonic Mitigation in PV Systems with Single-Phase Five-Level CHBMI. Energies 2018, 11, 2100.

Author Response

Response

Dear Editor and Reviewers,

Thank you for considering again for this paper (Energies-383939) and proposing revise opinion to us. In this paper, we have made serious modification to the proposed issues.

In the paper, for the modified text, we have highlighted with the blue background.

We are concerned about the formatting errors due to the differences in Word versions, which can influence the reading. So we uploaded both the Word documents and the PDF documents.

We greatly appreciate both your help and that of the referees concerning improvement to this paper. If there are still any questions or suggestions, please inform us, we will revise the manuscript and reply as soon as possible.

 

If you have any question about this paper, please don’t hesitate to contact us.

 

Yours sincerely,

 

Prof. Rutian Wang

Author Response File: Author Response.pdf