Robust Control of Distribution Static Compensator in Self-Excited Induction Generator-Based Wind Energy Systems Under Sensor Failures and Abnormal Load Conditions
Round 1
Reviewer 1 Report
Comments and Suggestions for Authors
Dear Authors
Please make the following corrections:
1.Figure 1 is illegible and needs to be replaced with a higher-quality, clearly readable version.
2.Equations 1 and 2 contain visible marks that make them impossible to read. Please review and correct the formatting of these equations.
3.Regarding the scope of the manuscript: The reviewer has raised a concern about whether the content of the manuscript is consistent with the journal's profile. The journal focuses on the use of sensors, whereas the manuscript primarily discusses a method for controlling a power-electronic converter in a sensorless configuration, with simulations conducted on a converter prototyping kit. There is limited connection to sensor-related topics. The authors are kindly requested to explicitly address and clarify the relevance of their work to the journal's scope in their response.
Best Regards
Reviewer
Author Response
Please see the attachment.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
Comments and Suggestions for Authors
This paper proposes a robust control strategy for a distribution static synchronous compensator (DSTATCOM) based on an advanced dual fourth-order generalized integrator phase-locked loop (ADFOGI-PLL) to address the issues of voltage/frequency instability and power quality deterioration in self-excited induction generator (SEIG)-based standalone wind energy systems. The engineering feasibility of the proposed method is verified through experimental tests. However, several deficiencies in the paper require further revision, which are detailed as follows:
1. In the Introduction section, the explanation of the mechanism underlying SEIG voltage/frequency instability is overly superficial, with only a qualitative description of "poor regulation capability". A detailed interpretation of the root causes of the SEIG’s sensitivity to load fluctuations, harmonics, and measurement-induced DC offset should be provided to clarify the necessity of this study.
2. At the end of the Introduction section, the six listed contributions are overly generalized, failing to distinguish differentiated innovations from existing studies and lacking clear incremental academic contributions. These should be condensed into 3 to 4 specific, verifiable, and differentiated core academic contributions. In addition, a new paragraph should be added at the end of the Introduction to briefly describe the core content of each subsequent section.
3. In Section 2, the systematic mathematical model is missing. Only the system schematic and parameter table are provided, while the core mathematical model of the SEIG-DSTATCOM system is not established, resulting in a lack of theoretical support for the subsequent controller design. Furthermore, there is no design basis for the system parameters: the parameters of the SEIG, excitation capacitor, and DSTATCOM are directly listed without explaining the selection principle and rationale.
4. In Section 3.1, the transfer functions corresponding to Equations (1) and (2) have serious typesetting and symbol errors: the angular frequency ω and ωÌ‚ are used inconsistently, and garbled characters are present, making the formulas unreadable and irreproducible.
5. In Section 3.1, the working principle of the DC offset rejection loop in the FOGI is not explained, with only a claim of "DC offset immunity" and no mechanism analysis or frequency domain verification. The FOGI filter parameters k1=2.82 and k2=0.25 are given directly without a design basis, and the rationale for parameter selection must be provided.
6. In Section 3.3, the complete software and hardware parameters of the DSP platform need to be supplemented, the reason for adopting a different platform from the system-level experiment should be explained, and the consistency of core parameters such as the sampling frequency must be guaranteed.
7. In Section 3.7, the current control strategy is not specified. It is only mentioned that "the current error generates PWM pulses", and the adopted current control method is not clearly defined, which is the core of the DSTATCOM control system.
8. In Section 4, the information on the experimental platform is incomplete. Only the OPAL-RT OP5707XG simulator is mentioned, while the core experimental parameters are not supplemented, including the controller sampling frequency, VSC switching frequency, model and parameters of the DAC/ADC modules, model of the oscilloscope for waveform acquisition, and the number of repeated experiments for each working condition.
9. The Conclusion section is overly lengthy, which repeats the content of the Abstract and experimental results and lacks a discussion on the limitations of the study. It is recommended to streamline the Conclusion section to highlight the main contributions. A subsection titled "Limitations and Future Work" should be added to discuss the limitations of the proposed method (such as computing resource requirements, parameter sensitivity, etc.).
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Round 2
Reviewer 2 Report
Comments and Suggestions for Authors
The author has completed the revisions based on the reviewer's comments, so this paper is ready for publication.
