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Abstract
The modular multilevel converter (MMC) has recently emerged as a promising candidate for medium-voltage megawatt grid emulators (GEs). However, when emulating grid faults, the MMC-based GE may encounter the transient overvoltage and voltage imbalance issues in its submodule (SM) capacitors. Following the mechanism analysis of these issues, this paper proposes an enhanced SM capacitor energy balancing approach. Differing from conventional methods, this approach effectively mitigates these issues even when emulating faults with residual voltages close to zero, ensuring the reliable operation of SM capacitors within 70%~110% of the rated voltage. Lastly, the effectiveness of the enhanced method is confirmed by the controller hardware-in-the-loop test.
Original language | English |
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Journal | I E E E Journal of Emerging and Selected Topics in Power Electronics |
Pages (from-to) | 1-15 |
Number of pages | 15 |
ISSN | 2168-6777 |
DOIs | |
Publication status | Published - 10 Apr 2024 |
Keywords
- Grid emulator
- grid faults
- modular multilevel converter
- transient overvoltage
- voltage imbalance
- Voltage fluctuations
- Capacitors
- Modulation
- Germanium
- Transient analysis
- Voltage control
- Fault currents
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Dive into the research topics of 'Analysis and Mitigation of Transient Overvoltage and Voltage Imbalance in Submodule Capacitors for MMC-Based Grid Emulators'. Together they form a unique fingerprint.Projects
- 2 Finished
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MODELING AND CONTROL OF SCALABLE VERSATILE GRID EMULATION SYSTEM
Li, Z., Wang, X., Munk-Nielsen, S. & Zhao, F.
15/10/2020 → 14/04/2024
Project: PhD Project
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MERGE: Megawatt Scalable Versatile Grid Emulation System
Wang, X., Bak-Jensen, B., Blaabjerg, F., Munk-Nielsen, S., Zhao, F., Taul, M. G., Ponnaganti, P. & Steffensen, B.
01/08/2020 → 31/07/2023
Project: Research