Multi-Mode Control of a Hybrid Transformer for the Coordinated Regulation of Voltage and Reverse Power in Active Distribution Network

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

The paper in general is a good paper, however some major comments should be addressed:

-          In the abstract, the main obtained results should be mentioned in the abstract.

-          The values in Figures 9- a, 10, 11, 14-a, 15, 16, 18, 20, 21, and 22 are not clear.

 

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

Comments and Suggestions for Authors

The introduction should cover similar solutions to show also the advantages of this proposition in relation to the different hybrid transformers not only the conventional.

he conclusion is too general. It is required that the findings/novelty/results of the paper are covered.

The quality of Figures is too low. The Figures e.g. 7 and 5 are partially unreadable.

The advantages of the proposed solution are not properly confirmed by the "Simulation Setup". 

The simulation scenarios should be discussed in the separate section of the paper and their justification should be analyzed in the context of the future transformer application - show the advantages in the context of problems to be solved in the power grid.

Author Response

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Author Response File: Author Response.pdf

Reviewer 3 Report

Comments and Suggestions for Authors

In fact, the paper contains all the elements necessary for publication in a journal.

The authors demonstrated the reverse power limiting capability, proposed a new HT configuration that can switch between active and passive modes of operation, implemented a multimode control strategy in an integrated SiC-MOSFET HT converter to provide both voltage regulation and reverse power flow limiting, and introduced a smooth and stable transition mechanism between the V-f control mode and P-Q control mode to address unlimited reverse power flow, voltage fluctuation, and overvoltage.

Despite the careful work, however, I have comments:

Figures for example 4 and 7 are unreadable.

Since the VSC1 controller uses the Park and Clark transform, why was the natural modulation method used (as in Figure 4) instead of vector modulation?

In the paper, it would be good to at least minimally summarize the results in comparison with other works on similar topics to concisely indicate the benefits of implementing the proposed approach. A comparison table could be a good summary.

Author Response

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Author Response File: Author Response.pdf

Reviewer 4 Report

Comments and Suggestions for Authors

To ensure the stability and security of active distribution networks with high renewable penetration, new technologies that support active grid management are crucial. Among all these technologies, one of the key technologies is the smart transformer technology due to its superior power control flexibility. Compared to conventional distribution transformers, the smart transformer offers the advantages of precise and continuous voltage regulation, four-quadrant power control, active power factor correction, harmonic suppression, compact size, etc.  Therefore, the topic of the manuscript under review is relevant.

This peer-reviewed paper presents a novel hybrid transformer topology with an integrated SiC-MOSFET-based back-to-back power converter. The proposed hybrid transformer configuration additionally employs a multi-mode control strategy to provide a smooth transition between dynamic voltage regulation and reverse power flow limitation. Simulation results show that the proposed multi-mode control strategy can effectively solve the voltage fluctuation problems and reverse the power flow with satisfactory performance.

The article has a good structure. The research results are presented with good quality illustrations.

The article is of interest to a wide range of specialists in the field of electrical engineering.

I consider it appropriate to publish the article in Processes.

Author Response

We deeply appreciate the reviewer’s comments and suggestions.

Round 2

Reviewer 2 Report

Comments and Suggestions for Authors

I'm satisfied with the improvement provided to the manuscript. I have no further comments and suggestions.

Author Response

We feel great thanks for reviewer's professional review work on our article.