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

Andrew, Euan Thomas and Ahmed, Khaled Hani and Holliday, Derrick (2022) A new model predictive current controller for grid connected converters in unbalanced grids. IEEE Transactions on Power Electronics, 37 (8). pp. 9175-9186. ISSN 0885-8993 (https://doi.org/10.1109/TPEL.2022.3158016)

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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.

ORCID iDs

Andrew, Euan Thomas ORCID logoORCID: https://orcid.org/0000-0003-4808-0292, Ahmed, Khaled Hani and Holliday, Derrick ORCID logoORCID: https://orcid.org/0000-0002-6561-4535;
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