Transformer Saturation Analysis and Mitigation for MMC-Based Grid Emulator

Xingxing Chen, Zejie Li*, Fangzhou Zhao, Xiongfei Wang, Martin Geske, Rayk Grune

*Corresponding author for this work

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

1 Citation (Scopus)


The modular multilevel converter (MMC)-based grid emulator emerges as a favorable solution for testing and validation of medium-voltage high-power wind turbines. The interface transformer of the grid emulator can be saturated when emulating voltage sags/swells in the faulted grids. The magnetic saturation can lead to severe inrush current, which may degrade the lifetime of transformer windings and even adversely affect the operation of grid emulator. This paper analyzes the dynamics of grid emulator under the interface-transformer saturation. It reveals the effect of the dc and harmonic components of magnetizing current on the MMC internal dynamics. An inrush current suppression technique is applied to mitigate the transformer saturation during the transient states, which guarantees the safety operation of the grid emulation system.
Original languageEnglish
Title of host publication2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023 - ECCE Asia) : Green World with Power Electronics
Number of pages5
Publication date22 Aug 2023
ISBN (Print)979-8-3503-3620-7
ISBN (Electronic)978-89-5708-350-5
Publication statusPublished - 22 Aug 2023


  • MMC
  • Grid emulator
  • transformer saturation


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