Grid-Following DVI-Based Converter Operating in Weak Grids for Enhancing Frequency Stability

Meysam Saeedian, Reza Sangrody, Mahdi Shahparasti, Shamsodin Taheri, Edris Pouresmaeil*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
49 Downloads (Pure)

Abstract

Inertia requirement is the paramount challenge in future power systems with a significant share of renewable energy generators. A promising solution to this issue is applying Distributed Virtual Inertia (DVI) concept, i.e. releasing energy preserved in the dc-link capacitors of employed power converters in the grid following a frequency disturbance. Nonetheless, small-signal stability analyses affirm that a local mode associated with the control system is prone to become unstable when the grid-interactive converter augmented with the DVI operates in weak grids. To overcome this problem, an efficient compensator is proposed in this paper. This compensator introduces one degree-of-freedom to the direct axis current controller in synchronous reference frame, which eliminates the adverse impact of DVI function on converter stability. Finally, the efficacy of the proposed control framework is depicted by simulations in MATLAB. The results illustrate that the grid frequency rate of change following a disturbance is improved by 30% compared to the case in which the DVI loop is nullified.
Original languageEnglish
Number of pages11
JournalIEEE Transactions on Power Delivery
DOIs
Publication statusE-pub ahead of print - 17 Feb 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Distributed virtual inertia
  • Modern power system
  • Weak grid
  • Phase-locked loop (PLL) dymanics
  • Grid frequency regulation

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