Location Selection of Charging Stations for Electric Taxis: A Bangkok Case
Round 1
Reviewer 1 Report
This paper propose a model for determining the optimal location of electric vehicle charge stations. In the opinion of this Reviewer, the paper is in general interesting. However, some clarifications and improvements to the presentation should be added in the paper.
Introduction
1. For the sake of readability, at the end of Section 1 the authors should describe how the paper is structured.
Terminology
2. The Authors should clarify what type of Electric Vehicles is considered. Do the Authors consider Battery Electric Vehicles (BEV) or plug-in hybrid vehicles (PHEV) or does it not matter? Because they have a different charging time, charging power and battery capacity.
Literature review
3. As the Authors correctly observe, location of the EVs plays an important role in finding an optimal solution for the charging problem, whereas most of the literature, especially from the power system community, does not take this aspect into account. Anyway, the authors should better highlight the innovative aspects of their work in the manuscript.
4. Several recent scientific studies on the optimal location of EVs charging station has to consider constraints induced by the power grid distribution lines and other components such as feeders (e.g., https://doi.org/10.1016/j.ifacol.2018.07.061, https://doi.org/10.1080/00207179.2012.679970, documents that could be cited in the manuscript). The authors should comment this point, mentioning if and how they model the distribution grid.
5. As the Authors correctly observe, a successful penetration of EVs necessarily relies on a proficient allocation of charging stations as well as control and management of large-scale EV fleet charging. Power quality and reliability of power grids may not be suitably addressed if EVs’ charging is not optimally coordinated. Several recent scientific studies focus on distributed/decentralized algorithms for large-scale situation (e.g., https://doi.org/10.1109/TCST.2011.2174059, https://doi.org/10.1109/LCSYS.2017.2716190, documents that could be cited in the manuscript). The authors should comment this point, mentioning if and how the proposed model is able to deal with large-scale dimensionality of a large scale fleet of EVs.
Results
6. How are the traffic data generated?
7. The author should report the running time of simulations (see the comment on large-scale dimensionality).
Minor
8. The authors should check that all the used acronyms are explained.
9. The authors should fix all the typos present in the manuscript.
Author Response
Please see the attachment.
Author Response File: 
Author Response.docx
Reviewer 2 Report
The manuscript is subject to the following major revisions:
Abstract: The abstract should be written in the following context: Background, objective(s), methods, results, conclusions, policy recommendations.
Introduction: The introduction lacks study background. What is the novelty? How is your study different from other studies? Please explain in detail.
Many important studies related to electric vehicles have been ignored. For instance, consult the following studies and improve your study:
https://doi.org/10.1016/j.trd.2021.103049
How you can compare your results with other studies of same geographical regions. It is pivotal to tie your results with other relevant literature.
Discussion: The study discussion is very generic and do not stem from study findings. It is suggested to rearrange discussion based on study findings.
It will be good if you link your study with COVID-19 pandemic: For instance, consult the following studies and improve your study
https://doi.org/10.1080/09603123.2022.2059452
Conclusions: Conclusions are very weak and miss several important dimensions. To strengthen the contents and quality of the study, conclusions must be revised for more clarity and for the ease of normal readers.
Policy recommendations: Specific policy recommendations should be put forward according to the target sample. General policies are of no use in scholarly articles.
Study limitations should be provided along with future research directions for prospective scholars interested in the similar works.
The authors have used several old references to support their arguments. We are in 2022 and you are using such old references. In order to nurture the importance of study, references should be updated using recent and relevant studies.
There is an intermingle of capital and small letters. Please avoid this practice in scientific writing.
Finally, the manuscript can be benefited if the authors thoroughly proofread it in terms of English language mistakes and syntax structure.
Author Response
Please see the attachment.
Author Response File: Author Response.docx
Reviewer 3 Report
This paper aims to study the optimal charging station locations for electric vehicle taxis. Overall, this paper does not propose an optimization method or model. The contribution is not enough to publish. In addition, there is a error in this paper.
For example, the formula of computing the distance between taxis and charging stations shown in (1) is incorrect. It should be
Dij=square root of the sum of (LatCi-LatSj)^2+(LonCi-LonSj)^2.
Author Response
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Author Response File: Author Response.docx
Reviewer 4 Report
Reviewer’s report:
Title: An analysis of optimal charging station locations for electric vehicle taxis: A Bangkok case.
In this work, the authors reported a process to find optimal charging locations for electrical vehicle taxis in Bangkok city to support the technological shift from Internal Combustion Engine to Electric Vehicle. Generally, the manuscript is good enough in term of topic and discussion which may beneficially for other scientists who work in the field. However, it still needs some revisions for better presentation.
1. At Fig.2., labels are too small.; Some notations in Figs.7(a) and (b) are still too small and unclear.; At Fig.8, labels/number of “X” and “Y” axes are too small, and the graph lines are unclear and fuzzy.
2. Letters in Fig.6 are too small, unclear to be seen, and fuzzy.
3. Fig.9 is still without legend / labels for detail information.
4. Ideally, the battery has to be charged at the lower percentage of capacity after the battery is used (discharge) which then it was fully charged at one plug up to 100% to keep the EV battery can be operated in longer cycle lifetime, in your research, in the range of how much percent the EV battery supposes to be charged?
5. By increasing a significantly growing number of EV taxis in the future, are the charger sites recommended in your research manuscript still reliable? Give some comments related to what circumstances prevent the EV charging stations location suggested in your study from functioning properly in the main text.
Comments for author File: 
Comments.pdf
Author Response
Please see the attachment.
Author Response File: Author Response.docx
Round 2
Reviewer 1 Report
Previous comments and concerns have been sufficiently addressed. In the revised paper several improvements have been added.
Author Response
Dear Reviewer,
Thank you for taking the time to review my manuscript. Thanks for all comments that improve my manuscript. The manuscript was sent to proofread again in terms of English language and style by MDPI as attached file.
Best regards,
Pichamon Keawthong
Author Response File: Author Response.docx
Reviewer 2 Report
Accept in the current form.
Author Response
Dear Reviewer,
Thank you for taking the time to review my manuscript. Thanks for all comments that improve my manuscript. The manuscript was sent to proofread again in terms of English language and style by MDPI as attached file.
Best regards,
Pichamon Keawthong
Author Response File: Author Response.docx
Reviewer 3 Report
Although the authors modified some errors, the method proposed in the paper is intuitive. This paper does not propose an optimization method or model. The contribution is not enough to publish.
Author Response
Dear Reviewer,
Thank you for taking the time to review my manuscript. Thanks for all comments that improve my manuscript. Please see the attached file.
Best regards,
Pichamon Keawthong
Author Response File: Author Response.docx
