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Energies 2017, 10(8), 1133; doi:10.3390/en10081133

Model Predictive Direct Power Control for Nonredundant Fault Tolerant Grid-Connected Bidirectional Voltage Source Converter

1,2
,
1,* and 3
1
Department of Electrical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, China
2
Department of Electrical Engineering and Computer Science, University of Tennessee, Knoxville, TN 37996, USA
3
Department of Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
*
Author to whom correspondence should be addressed.
Received: 7 July 2017 / Revised: 27 July 2017 / Accepted: 28 July 2017 / Published: 2 August 2017
(This article belongs to the Section Energy Fundamentals and Conversion)
View Full-Text   |   Download PDF [7870 KB, uploaded 2 August 2017]   |  

Abstract

This paper proposes a model predictive direct power control scheme for nonredundant fault tolerant grid-connected bidirectional voltage source converter (BVSC) with balanced dc-link split capacitor voltage and high reliability. Based on the operation analysis of fault-tolerant BVSC with phase leg faults, a power predictive model of three-phase four-switch fault-tolerant topology in αβ coordinates is established, and the space voltage vectors with unbalanced dc-link split capacitor voltage are analyzed. According to the power predictive model and cost function, the optimal space voltage vector is selected to achieve a flexible, smooth transition between inverter and rectifier mode with direct power control. Pulse width modulation and phase locked loop are not required in the proposed method. The constraint of dc-link voltage constraint is designed for the cost function to achieve a central point of dc-link voltage offset suppression, which can reduce the risk of electrolytic capacitor failure for over-voltage operation. With the proposed control method, the converter can work continuously in both inverter mode and rectifier mode, even if phase leg faults occur. The simulation and experimental results show good steady-state and dynamic performance of the proposed control scheme to enhance the reliability of bidirectional power conversion. View Full-Text
Keywords: bidirectional voltage source converter; model predictive control; three-phase four-switch; fault tolerant; open circuits faults bidirectional voltage source converter; model predictive control; three-phase four-switch; fault tolerant; open circuits faults
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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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MDPI and ACS Style

Jin, N.; Guo, L.; Yao, G. Model Predictive Direct Power Control for Nonredundant Fault Tolerant Grid-Connected Bidirectional Voltage Source Converter. Energies 2017, 10, 1133.

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