Passive Super-Twisting Second-Order Sliding Mode Control Strategy for Input Stage of MMC-PET

Round 1

Reviewer 1 Report

The paper proposes a passive Super-Twisting second-order sliding mode control strategy for the input stage of Modular Multilevel Converter Power Electronic Transformers (MMC-PET). The strategy combines passivity-based control and second-order sliding mode control to address efficiency and energy transfer issues in the power system. The method is developed based on an Euler-Lagrange model, and simulation results demonstrate its effectiveness under various non-ideal working conditions. The study contributes to enhancing the reliability and robustness of MMC-PET systems in power transmission applications.

My comments:

1) Can you provide more insights into the selection criteria for the passive Super-Twisting second-order sliding mode control strategy over other control methods?

2) How does the proposed strategy handle parameter uncertainties and variations in operating conditions?

3) Could you elaborate on the design considerations and optimization process for the passive controller based on the Euler-Lagrange model?

4) What challenges were encountered during the simulation experiments, and how were they addressed?

5) Have you considered real-world implementation challenges and scalability of the proposed strategy in large-scale power systems?

6) Can you discuss the computational complexity and real-time feasibility of the proposed control strategy for practical applications?

7) How does the proposed strategy mitigate DC side voltage, power, and current fluctuations under non-ideal conditions, and what performance metrics were used for evaluation?

8) Are there any limitations or trade-offs associated with the passive Super-Twisting second-order sliding mode control approach compared to other control strategies?

9) What are the future research directions or potential extensions of this work in advancing MMC-PET control strategies for emerging power system challenges?

Author Response

Thank you very much for taking the time to review this manuscript. Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

In this manuscript, the passive second-order super-helical sliding mode control strategy for MMC-PET is studied for efficient energy transfer and power conversion under conventional control strategies. The study is interest to readers. This manuscript is acceptable for publishing.

Author Response

Thank you very much for taking the time to review this manuscript. Please see the attachment.

Author Response File: Author Response.pdf