Voltage Stability and Transient Symmetrical Fault Current Control of Voltage-Controlled MMCs

Yingbiao Li, Jianbo Guo, Heng Wu, Xiongfei Wang*, Bing Zhao, Shanshan Wang, Guanglu Wu

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

3 Citations (Scopus)
30 Downloads (Pure)


This paper presents a design-oriented analysis on the voltage stability and the transient fault current limitation of voltage-controlled modular multilevel converter (MMC) with L-filters. First, a dual-loop voltage control based on the L-filter plant is systematically designed, where the upper limits of controller parameters to ensure the small-signal stability are identified. Then, considering the transient current limitation during faults, the lower boundaries of inner current controller parameters are derived. Within the region of allowed controller parameters, the optimization is further made to minimize the closed-loop output impedance of MMC, which enhances the output voltage stiffness against the load current disturbance. Lastly, time-domain simulations corroborate the theoretical analysis.
Original languageEnglish
Article number8974229
JournalIEEE Transactions on Power Delivery
Issue number5
Pages (from-to)2506-2516
Number of pages11
Publication statusPublished - Oct 2020


  • Fault currents
  • Feedforward systems
  • Modular Multilevel Converter (MMC)
  • Power system stability
  • Regulators
  • Transient analysis
  • Voltage control
  • Wind farms
  • controller design
  • fault current
  • voltage control


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