Transient Synchronizing Stability of Droop-Controlled Converter during Grid Fault Considering Current Saturation Limitation
Round 1
Reviewer 1 Report
Dear authors,
The topic of your manuscript “Transient Synchronizing Stability of Droop-controlled Converter During Grid Fault Considering Current Saturation Limitation” is interesting and relevant. I have the following comments,
The structure and content of the manuscript gives the appearance of a technical report more than a research paper. I suggest that you restructure and rewrite several sections to develop the format of a research paper. There are some specific suggestions
The manuscript should follow the traditional structure of a research paper: introduction, methods & materials, results, discussion, and conclusion. At this point many sections contain material that should be in a different section, hindering the narrative of the paper and not allowing the reader to fully grasp the implication of your research
The novelty and scientific contribution should be highlighted and emphasized in a justification paragraph, at the end of the introduction. Indicate what improvement is presented in the research over current state of science and technology, and the benefits that other researchers and industry may obtain from this scientific contribution.
The abstract should be rewritten and improve, to highlight to the reader the scientific contribution of the manuscript and the main results that justify its relevance and application.
The introduction should expanded make additional emphasis on the current state of science and technology, including more recent papers that highlight the latest research on the topic.
There is material in all sections that should be in the methods and material section. This should be restructured.
Results are presented in a disorganized fashion in the manuscript. I would suggest restructuring them to present them following a logical narrative style. Connecting the results to the scientific contribution and novelty of the research will be critical. Explain how the results prove/disprove the hypothesis for this research and advance current state of science and technology
I would suggest for the manuscript to be reviewed and edited by a proficient editor
Author Response
Please see the attachment.
Author Response File: 
Author Response.docx
Reviewer 2 Report
Dear authors, the article deals with an exciting topic, but I have some suggestions. First of all, it is hard to read. I suggest you perform a deep English revision; maybe some of my concerns are due to the lack of good written English.
Please clarify the contribution of the article. It mentions a model is developed, but it is not clear if you are proposing a model or if the model already exists. Please be clear and honest; if the model already exists, you must declare it and cite the reference where you get it.
Then it mentions that a study is performed based on this model. I am not sure if the function you mention in which the converter switch from voltage to current controlled is proposed by you or if it is a normal function of a previous model (Figure 3). Please also explain the phenomena of the current saturation.
Please explain the motivation of your study, why it is important, or who may be interested to know these results. Why you didn´t present experimental results? Do you think the simulation is accurate enough?
Finally, I have included some suggestions about the grammar. Some are not incorrect, but they are just uncommon in American English (they are not exhaustive).
- On page 1, line 11 says:
“converter dominated power system”
- I suggest changing it for:
“a converter-dominated power system”
or
“converter-dominated power systems”
- On page 1, line 16 says:
“switched mode of converter,”
- I suggest changing it for:
“switched mode of the converter,”
or
“switched mode of a converter,”
- On page 1, line 17 says:
“similar as rotor motion of synchronous generator”
- I suggest changing it for:
“similar to the rotor motion of a synchronous generator”
- On page 1, line 18 says:
“It is identified as that the”
- I suggest changing it for:
“It is identified that the”
- On page 1, line 32 says:
“provide temporary power supply”
- I suggest changing it for:
“provide a temporary power supply”
- On page 1, line 37 says:
“the control mode of converter”
- I suggest changing it for:
“the control mode of converters”
- On page 1, line 41 says:
“through phase-locked loop (PLL)”
- I suggest changing it for:
“through a phase-locked loop (PLL)”
- On page 2, line 46 says:
“which is easy to lead to system instability”
- I suggest changing it for:
“which easily leads to system instability”
- On page 2, line 64 says:
“the stable operation of power system”
- I suggest changing it for:
“the stable operation of the power system”
- On page 2, line 68 says:
“The stability under small disturbance can be linearized in time domain or complex frequency domain”
- I suggest changing it for:
“The stability under small disturbances can be linearized in the time domain or complex frequency domain”
- On page 2, line 84 says:
“detailed analysis of current limiting mode”
- I suggest changing it for:
“detailed analysis of the current limiting mode”
- On page 2, line 88 says:
“However, only the situation that the system directly entered the current saturation after fault was analyzed,”
- I suggest changing it for:
“However, only in the situation where the system directly entered the current saturation after a fault was analyzed”
- On page 3, line 106 says:
“in rotating coordinate system”
- I suggest changing it for:
“in a rotating coordinate system”
- On page 14, line 418 says:
“An equivalent motion model similar as rotor motion of synchronous generator is developed to depict the transient synchronizing dynamics”
- I suggest changing it for:
“An equivalent motion model similar to the rotor motion of a synchronous generator is developed to depict the transient synchronizing dynamics”
- On page 14, line 422 says:
“output current of converter is saturated”
- I suggest changing it for:
“the output current of the converter”
Author Response
Please see the attachment
Author Response File: Author Response.docx
Round 2
Reviewer 1 Report
The authors addressed most of the review comments in this new version of the manuscript.
Reviewer 2 Report
My comments have been addressed; thank you.
