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Energies 2017, 10(12), 2129; doi:10.3390/en10122129

Near State Vector Selection-Based Model Predictive Control with Common Mode Voltage Mitigation for a Three-Phase Four-Leg Inverter

1
Power Electronics and Renewable Energy Laboratory, Department of Electrical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
2
Department of Computer System & Technology, University of Malaya, Kuala Lumpur 50603, Malaysia
3
School of Engineering, Deakin University, Waurn Ponds, Victoria 3216, Australia
*
Author to whom correspondence should be addressed.
Received: 25 October 2017 / Revised: 7 December 2017 / Accepted: 8 December 2017 / Published: 14 December 2017
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Abstract

A high computational burden is required in conventional model predictive control, as all of the voltage vectors of a power inverter are used to predict the future behavior of the system. Apart from that, the common mode voltage (CMV) of a three-phase four-leg inverter utilizes up to half of the DC-link voltage due to the use of all of the available voltage vectors. Thus, this paper proposes a near state vector selection-based model predictive control (NSV-MPC) scheme to mitigate the CMV and reduce computational burden. In the proposed technique, only six active voltage vectors are used in the predictive model, and the vectors are selected based on the position of the future reference vector. In every sampling period, the position of the reference current is used to detect the voltage vectors surrounding the reference voltage vector. Besides the six active vectors, one of the zero vectors is also used. The proposed technique is compared with the conventional control scheme in terms of execution time, CMV variation, and load current ripple in both simulation and an experimental setup. The LabVIEW Field programmable gate array rapid prototyping controller is used to validate the proposed control scheme experimentally, and demonstrate that the CMV can be bounded within one-fourth of the DC-link voltage. View Full-Text
Keywords: near state vector selection based model predictive control; common mode voltage; ripple content; execution time; computational burden and three phase four leg inverter near state vector selection based model predictive control; common mode voltage; ripple content; execution time; computational burden and three phase four leg inverter
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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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Dadu, A.M.; Mekhilef, S.; Soon, T.K.; Seyedmahmoudian, M.; Horan, B. Near State Vector Selection-Based Model Predictive Control with Common Mode Voltage Mitigation for a Three-Phase Four-Leg Inverter. Energies 2017, 10, 2129.

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