DC voltage stability analysis and enhancement for grid-forming-based MTDC systems

Ying Pang, Agusti Egea-Alvarez, Juan Carlos Gonzalez-Torres, Kosei Shinoda, Filipe Perez, Abdelkrim Benchaib

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Abstract

This letter first identifies a new mode of lowfrequency harmonic instability when combining grid-forming control with the typical DC voltage droop control necessitated in multi-terminal high voltage direct-current transmissions. This mode does not exist when grid-following control is applied and its mechanism is explicitly revealed by the DC-side input admittance modeling of the converter. Then, a phase compensator plus a virtual power system stabilizer are introduced to pacify the input admittance within the critical frequency range and de-risk the related instability. Last, it is also demonstrated that the proposed control strategy achieves excellent performance in contingent active power imbalance ride-through in the DC system. All the analyses are verified by electro-magnetic-transient simulations with a modular multi-level converter model comprising 278 submodules per arm.
Original languageEnglish
Pages (from-to)1-4
Number of pages4
JournalIEEE Transactions on Power Electronics
Early online date10 Apr 2024
DOIs
Publication statusE-pub ahead of print - 10 Apr 2024

Keywords

  • grid-forming
  • MTDC
  • DC voltage droop
  • harmonic instability
  • phase compensator
  • virtual power system stabilizer
  • MMC

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