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Response to reviewers' comments and changes

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Mar 20, 2012 - Response to reviewers' comments and changes. The author appreciates the effort made by the editor and reviewers. Below you will find my ...
EL-Shimy M. Reactive Power Management and Control of Distant Large-Scale Grid-Connected Offshore Wind Power Farms. International Journal of Sustainable Energy (IJSE), 2012. Available online: Mar 20, 2012. Volume 32, Issue 5, pp. 449 - 465, 2013.

Response to reviewers’ comments and changes The author appreciates the effort made by the editor and reviewers. Below you will find my response (in red-colored text) to the raised comments and explanation of other necessary changes. In addition, all changes in the manuscript are highlighted by red-colored text.

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Reviewer: 1 Comment: Overall, there are several verb tense issues that need corrections. Abstract: the word "considered" is used several times. Please rewrite the abstract. Page 2 rewrite last 2 paragraphs. repl fewer with lower... Page 3 2nd paragraph VDEW is defined in page 9. Page 3 third paragraph from bottom is repeated. Page 6 2nd paragraph reactive power demanded should read reactive power demand. Page 7 match verb with subject... is > are. Page 8 sect 3 second sentence is repeated. Page 10 rewrite second paragraph. Page 12 depicted is used twice, rewrite the first paragraph and last paragraph at the bottom of page 12. Conclusion can be improved. Response: All linguistic issues have been taken into account in this version of the manuscript. Thank you.

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Reviewer: 2 Comment: This paper summarizes the impacts of the DFIG parameters on the reactive power capability. The results suggest that reactive power capability will be limited under the rated operation of the WF and TCRs would be necessary. WF are known as intermittent and fluctuated generator so dynamic characteristics will be important. Power electronics devices may have advantages for VAR compensation in this case. Dynamic operation characteristics of WF should be included in the discussion. Problems and limitation of HVAC are stated in the manuscript but concrete solution is not described. The objective needs to be clearly stated in order to clarify what is the purpose, what is the conclusion and what is the future work.

Response:

In this current version of the manuscript, the objectives are clearly stated to distinguish the purpose of the work, the outcome, recommendations, and suggestions for future work. The manuscript is mainly dealing with reactive power analysis from steady-state point of view. Therefore, additional modeling and simulation efforts are required to perform a dynamic analysis. An accurate analysis of the dynamic performance and analysis of wind farms, including necessary reactive power compensating devices will be considered in a separate manuscript in order to provide sufficient details. **********************************************************************************

Other necessary changes    

A complete nomenclature is included in the manuscript (Tables 1 to 3). Two additional appendices have been added to the manuscript. These are Appendix B and C to prove equations (1) and (12) respectively. In addition, a brief explanation of the steatdystate stability limits of DFIGs has been included in Appendix C. A typing error is found in equation (2) and corrected in the current version of the manuscript. The author checked that the equation was originally written correctly in the MATLAB code created to handle the calculations. The results that were presented in Fig. 4 suffered from error in estimating the maximum reactive power limits due to a minor MATLAB coding mistake. Therefore, the correct results and conclusions are carefully included in this version of the paper. In the current version, Fig. 4(a) shows the effective capability region as affected by stator voltage variations for the acceptable voltage bandwidth. In Fig. 4(b), the relation between and is shown. These figures are obtained using equations (8), and (10) to (12) with the stator voltage being changed from 0.95 p.u. to 1.05 p.u.

********************************************************************************** Thank you again for your efforts and I am looking forward to receiving your response.