A new model predictive current controller for grid connected converters in unbalanced grids

Euan Thomas Andrew, Khaled Hani Ahmed, Derrick Holliday

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)
68 Downloads (Pure)

Abstract

Distributed energy resources are often connected to low-voltage distribution networks where the grid voltages may be unbalanced. This leads to an unwanted ripple in the output active power at twice the fundamental grid frequency. In this article, a new model predictive current controller is proposed for unbalanced grids. The variable switching frequency of existing model predictive controllers is fixed and the power quality is improved. A Kalman filter estimator is used to extract the positive and negative sequence components. A new calculation time compensation technique is proposed, which offers superior accuracy to existing approaches. A grid voltage discretization compensation strategy is outlined, and its effectiveness is demonstrated. Finally, the system stability is verified theoretically. Simulation and laboratory results are included to prove the robustness of the proposed controller and support the theoretical analysis.

Original languageEnglish
Pages (from-to)9175-9186
Number of pages12
JournalIEEE Transactions on Power Electronics
Volume37
Issue number8
Early online date9 Mar 2022
DOIs
Publication statusPublished - 31 Aug 2022

Keywords

  • current control
  • grid connected
  • modulated model predictive control
  • voltage source converter

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