A New Perspective for Relating Virtual Inertia With Wideband Oscillation of Voltage in Low-Inertia DC Microgrid

Chang Li, Yaqian Yang, Tomislav Dragicevic, Frede Blaabjerg

Research output: Contribution to journalJournal articleResearchpeer-review

2 Citations (Scopus)

Abstract

Virtual synchronous generator (VSG) has been a grid-friendly integration control technique for the integration of grid-connected inverters. However, the emulated inertia and damping of VSG control technique can also be used in the field of dc systems. In this article, a virtual synchronous control is proposed to dampen the wideband oscillation of dc voltage in a dc microgrid. The proposed control strategy contributes to maintaining the synchronous operation of dc converter with the network. Besides, the relationships among damping, inertia, wideband oscillation, rate of change of voltage (RoCoV) as well as DC voltage nadir (DCVN) are studied. It is concluded that the RoCoV and DCVN are similar as the oscillation frequency and fluctuation ranges of poorly-damped oscillation, respectively. A unified concept is proposed by connecting the oscillation-related stability with the inertial transient response originated from the imbalanced powers/mismatched currents. Besides this, the inertia plays the same role as damping because the inertia contributes to maintaining the original state and damping to impeding further change. A new feedback analytical method is proposed to clarify the important role of RoCoV and DCVN on the motion of dc voltage. Finally, the theoretical results are compared with simulations and experiments.
Original languageEnglish
Article number9507350
JournalI E E E Transactions on Industrial Electronics
Volume69
Issue number7
Pages (from-to)7029 - 7039
Number of pages11
ISSN0278-0046
DOIs
Publication statusPublished - Jul 2022

Keywords

  • DC voltage nadir (DCVN)
  • feedback analytical method
  • inertia and damping
  • poorly-damped oscillations
  • rate of change of voltage (RoCoV)
  • virtual synchronous generator (VSG)

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