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Energies 2016, 9(1), 41; doi:10.3390/en9010041

Enhanced Predictive Current Control of Three-Phase Grid-Tied Reversible Converters with Improved Switching Patterns

1,†,* , 2,†
,
2
and
3
1
Department of Electrical Engineering and Automation, Tianjin University, Tianjin 30072, China
2
Department of Energy Technology, Aalborg University, Aalborg 9220, Denmark
3
Faculty of Science and Engineering, University of Chester, Chester CH1 4BJ, UK
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Frede Blaabjerg
Received: 2 November 2015 / Revised: 1 December 2015 / Accepted: 30 December 2015 / Published: 13 January 2016
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Abstract

A predictive current control strategy can realize flexible regulation of three-phase grid-tied converters based on system behaviour prediction and cost function minimization. However, when the predictive current control strategy with conventional switching patterns is adopted, the predicted duration time for voltage vectors turns out to be negative in some cases, especially under the conditions of bidirectional power flows and transient situations, leading to system performance deteriorations. This paper aims to clarify the real reason for this phenomenon under bidirectional power flows, i.e., rectifier mode and inverter mode, and, furthermore, seeks to propose effective solutions. A detailed analysis of instantaneous current variations under different conditions was conducted. An enhanced predictive current control strategy with improved switching patterns was then proposed. An experimental platform was built based on a commercial converter produced by Danfoss, and moreover, relative experiments were carried out, confirming the superiority of the proposed scheme. View Full-Text
Keywords: predictive control; bidirectional power flow; three-phase grid-tied converters; improved switching pattern; cost function minimization predictive control; bidirectional power flow; three-phase grid-tied converters; improved switching pattern; cost function minimization
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Song, Z.; Tian, Y.; Chen, Z.; Hu, Y. Enhanced Predictive Current Control of Three-Phase Grid-Tied Reversible Converters with Improved Switching Patterns. Energies 2016, 9, 41.

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