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Application of Dual-Grid-Forming MMC for Seamless Transition between Grid Connected and Islanded Operation in Microgrids

Abstract

This paper presents a control strategy based on dual-grid-forming applied to modular multilevel converters. The goal is to ensure seamless transitions between grid-connected and island operations in ac microgrids. This control strategy is tested in a case where a back-to-back multilevel converter interconnects a microgrid to a system with a low short-circuit ratio. While conventional approaches rely on islanding detection algorithms and control mode shifts, the proposed technique eliminates the need for such mechanisms, averting potential instabilities. The dual-grid-forming approach synchronizes the grid frequency with the converter’s internal energy while enabling concurrent dc voltage regulation. This paper explores the design, implementation, and performance of such a control strategy showcasing its effectiveness in enhancing grid stability and ensuring reliable operation at several grid strengths.
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Category

Academic chapter

Language

English

Author(s)

Affiliation

  • SINTEF Energy Research / Energisystemer
  • University of Trento
  • Norwegian University of Science and Technology

Year

2024

Publisher

IEEE (Institute of Electrical and Electronics Engineers)

Book

2024 IEEE PES Innovative Smart Grid Technologies Europe Conference – ISGT Europe 2024

ISBN

9798350390421

View this publication at Norwegian Research Information Repository