Adaptive Frequency Control Strategy for PMSG-Based Wind Power Plant Considering Releasable Reserve Power

Round 1

Reviewer 1 Report

An adaptive frequency control strategy for PMSG-based wind farms considering releasable reserve power was proposed, and it can enhance the frequency regulation capacity of wind farm. The inertial control gains of frequency controller for PMSGs adjusted adaptively depending on the releasable kinetic energy, meanwhile, the primary frequency control gains adjusted adaptively depending on the releasable deloading power. This study is forward-looking and practical, but the following points need to be modified:

1. Figure 2 is not clear, and keep the font size as large as possible;
2. The subscript after PMSG is worth discussing in the whole paper (line 212);
3. In the case studies part, the numerical examples are very rich, and the effectiveness of the control method mentioned in this paper is fully proved; But Figure 7 is not the right size, and the position of Figure 18 needs to be adjusted。

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

The subject of this paper is very interesting.

Generally it is well-written. But the mathematical description of the model should be more readable. More specifically, there are some shortages, as:

-> The calculation of the parameters kv,i , kv0, ka0 in eq. (8), (9), (10) is not obvious. How have the authors determined the initial values?

-> The method of "deloading power" should be explained in a better way.

-> The stability of the control system has not be proofed. 

-> The values of wind penetration level in case study should be justified.

-> In lines 288-290 "upstream PMSGs" has been put twice and the sentence has no meaning.

 -> The behaviour of wind park for different wind directions could be investigated.

Author Response

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Author Response File: Author Response.pdf

Reviewer 3 Report

1. Line 124-126. Please explain more about the three zones: What is the (i) maximum power tracking zone, the (ii) constant speed zone and the (iii) constant power zone.
2. Line 132-133.  Please change the words. Too much using of ...."in order to..."
3. Because of too many abbreviations, please create the Nomenclature Table, and write all the abbreviations in the Table. It will be easier for readers to refer.
4. Line 272. Figure 8. It should be under the picture. And, please explain about fig 8. What is the meaning of the red line, why it goes up and down, what is the meaning of rated power, and so on? Tell the explanation about the graph.
5. What is TABLE 1 about? why the table title is only (m/s)? what does it mean? Please state clearly what data do you want to show in the Table. What are those numbers meant? Please put one more column at the left side to explain the numbers items. CHECK FOR ALL TABLES.
6. The explanation of Fig 13 was not clear. Please make more explanation and comparison of Fig 13 (a), (b), (c), and (d). Why the graph have to divide into 4 pictures a,b,c,d?
7. Please move Table 7 into the main manuscript.
8. Figure 18. Make center and add spaces before the next paragraph. Check all figures, too.
9. Please rearrange the writing according to the English grammar.
10. Please rearrange the manuscript according to the right format.

 

Author Response

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Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

Reviewer 2 is satisfied by authors'answers. The authors could check in Fig. 7 if the load trasnformers T4 and T5 have voltage ratio 20/230 kV instead of 200/230 kV. 

Reviewer 3 Report

Keep the work