Model Predictive Control-Based Virtual Inertia Emulator for an Islanded Alternating Current Microgrid

Changming Zheng*, Tomislav Dragicevic, Frede Blaabjerg

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Conventional primary control employs outer-loop droop and inner-loop cascaded linear control to realize local voltage regulation and power-sharing of an islanded ac microgrid. However, it has a complex structure, limited dynamic response, and a rapid rate of change of frequency when disturbances occur. This article resolves these issues by proposing a model predictive control-based virtual synchronous generator (VSG-MPC). An improved finite-set MPC is first proposed for the inner loop, achieving simplified control structure, faster dynamic response, enhanced bandwidth and stability, as well as improved current limitation. In the outer control loop, a simplified VSG without a phase-locked loop is employed to realize active power-sharing and inertia emulation. The merits above are verified by a description function of MPC and the frequency-domain response of the overall VSG. Simulation and experimental results verify the feasibility of the proposed method.

Original languageEnglish
Article number9138790
JournalIEEE Transactions on Industrial Electronics
Volume68
Issue number8
Pages (from-to)7167-7177
ISSN0278-0046
DOIs
Publication statusPublished - Aug 2021

Bibliographical note

Publisher Copyright:
© 1982-2012 IEEE.

Keywords

  • Microgrid
  • Predictive control
  • Virtual synchronous generator (VSG)
  • Voltage source converter

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