A Virtual Synchronous Generator Low-Voltage Ride-Through Control Strategy Considering Complex Grid Faults

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

1. Introduction: (i) Integrate a detailed literature synthesis to identify research gaps more explicitly. (ii) Include recent studies (2020–2025) on LVRT, VSG advancements, and harmonic suppression techniques.
2. Methodology: (i) Provide additional clarity on the mathematical derivations and parameter selection for the improved DSOGI-PLL. (ii) Explain how the proposed methods can be scaled for industrial applications.
3. Results: (i) Compare the performance of the proposed control strategy with other recent LVRT methods. (ii) Include discussions on the economic and operational impact of the enhancements.
4. Language and Structure: (i) Proofread the manuscript to fix grammatical errors and improve readability. (ii) Use concise language and avoid repetition across sections.

Comments on the Quality of English Language

The English could be improved to express the research more clearly.

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

Comments and Suggestions for Authors

The authors of this article study how a Virtual Synchronous Generator Low Voltage Ride-Through Control Strategy Considering Complex Grid Faults could be used as a to improve traditional control strategies to stabilize grid-connected currents when the grid voltage contains harmonic interference or a certain degree of imbalance. The PSCAD simulations are conducted to verify the effectiveness and authenticity of the proposed control strategy. An LC-type VSG control model is implemented, and various PSCAD simulation tests are conducted to verify the accuracy and usefulness of the proposed control strategy its. The simulation results show that the proposed system could assist in maintaining the grid's quality.

Comments:

1.     I don't see the citation [1-3] and [11-30] in the text. 30 positions is in the bibliographic references, but only position from 3 to 10  was cited in the text;

2.      Could you provide more detailed information on the models used for the generators  so that the reader can replicate the simulations?

3.     Does this virtual generator is scalable? The data used in the simulations as inputs would allow us to know the operating ranges and therefore that Could you please quantify this?

4.     Could you run simulations assuming a case where a assumption are used as different than in equation 2? This would allow us to verify whether or not the proposed system is better than solutions known from literature.

5.      In Figure 14 b, why the frequency decreases?. Why does it not constant?

6.     In line 97, is equation. In my opinion it should be presented in equation style (with number)  and in addition could you clarify this equation?

7.     In figure 16, two different  values of fundamental components appear, could you clarify this.

8.     Line 371. In my opinion the chapter name should be “Conclusions”   Could you improve that?

In the current state of the article, it should not be published. I encourage the authors to continue working on this line to improve it.

Author Response

Please see attached

 

Author Response File: Author Response.pdf

Reviewer 3 Report

Comments and Suggestions for Authors

Review the Manuscript ID: applsci-3445841

Title: Virtual Synchronous Generator Low Voltage Ride-Through Control Strategy Considering Complex Grid Faults

This paper investigates the low-voltage ride-through (LVRT) control strategy for Virtual Synchronous Generator (VSG) under harmonic-containing asymmetric voltage sags in the power grid. The objective is to improve traditional control strategies to stabilize grid-connected currents when the grid voltage contains harmonic interference or a certain degree of imbalance.

The literature review needs to be revised. The authors often indicate Literature [x], but then do not develop the key points of these studies and what improvements were introduced by the methodology developed. There are many studies developed on the topic presented in the article.

Section 2 needs improvement. The authors need to identify in more detail the information presented in Figures 1 and 2. This information is relevant to identify the methodology developed.

In sections 3 and 4, the authors must improve the way in which the figures and equations are integrated, and the explanation of what the variables included in the figures and equations represent. In these sections, there are no bibliographical references. The authors assume authorship of all equation diagrams.

In Figure 7 the authors present the Control Block Diagram of Improved DSOGI-PLL Based on AHE, which has the ability to eliminate and alter the input signal, however they do not identify the spatial implications that these alterations may have on the response time and system reliability.

In section 4.2. Feedforward Design, the authors identify the solution they present, the information is not explained with the technical detail that allows identifying the proposed objectives.

In section 5- Simulation Verification, the authors identify in Table 1. Simulation-related Parameters, which was the criterion for choosing these values ​​for the parameters. Were they taken from some reference model for this type of study?

What is the criterion used for the percentage assumed for each of the harmonics considered?

The authors state: Figure 15 presents a comparison of active and reactive power under different control and perform a comparison between the two solutions. However, it is not possible to identify, from the figure, the amplitudes referred to for active and reactive power. Again, a more detailed explanation of the information is needed.

Section 6 needs to be identified with another title, and its structure improved.

The authors should review the text and correct some spelling and grammatical lapses.

Comments on the Quality of English Language

The authors should review the text and correct some spelling and grammatical lapses.

Author Response

Please see attached

Author Response File: Author Response.pdf

Round 2

Reviewer 3 Report

Comments and Suggestions for Authors

Review the Manuscript ID: applsci-3445841

Title: Virtual Synchronous Generator Low Voltage Ride-Through Control Strategy Considering Complex Grid Faults

This paper investigates the low-voltage ride-through (LVRT) control strategy for Virtual Synchronous Generator (VSG) under harmonic-containing asymmetric voltage sags in the power grid. The objective is to improve traditional control strategies to stabilize grid-connected currents when the grid voltage contains harmonic interference or a certain degree of imbalance.

The review / correction performed by the authors allowed an improvement in the quality of the paper.