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Electrical Engineering

Control of MMC-HVDC transmission system: a review on internal and external converter control under grid strength

  • 14-07-2023
  • Original Paper
Published in:
Authors
Farzin Gharaghani
Mehdi Asadi
Published in
Electrical Engineering | Issue 6/2023

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Abstract

The article delves into the control strategies for Modular Multilevel Converter (MMC)-based High-Voltage Direct Current (HVDC) transmission systems, emphasizing the distinction between internal and external converter controls. It begins by highlighting the advantages of MMC-HVDC technology, such as full power controllability and high efficiency, while acknowledging the complexity of its control procedures. The control system is divided into internal and external converter loops, each addressing specific dynamics. Internal converter control focuses on suppressing circulating currents, while external control deals with grid interactions. The strength of the AC grid significantly influences the control strategies, with weak grids posing synchronization challenges. The article reviews various control methods, including vector current control, virtual synchronous machine-based control, and droop control, and discusses their features and drawbacks. Notably, it introduces advanced methods like virtual synchronous generator-based control and frequency-based synchronization control, which offer innovative solutions to grid strength challenges. The paper concludes by identifying future research directions and emphasizing the need for comprehensive modeling and nonlinear control methods in MMC-HVDC systems.
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Title
Control of MMC-HVDC transmission system: a review on internal and external converter control under grid strength
Authors
Farzin Gharaghani
Mehdi Asadi
Publication date
14-07-2023
Publisher
Springer Berlin Heidelberg
Published in
Electrical Engineering / Issue 6/2023
Print ISSN: 0948-7921
Electronic ISSN: 1432-0487
DOI
https://doi.org/10.1007/s00202-023-01908-1
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