Computationally Efficient Cascaded Optimal Switching Sequence MPC for Grid-Connected Three-Level NPC Converters

In this work, a model predictive control (MPC) strategy based on optimal switching sequence (OSS) concepts is proposed for a grid-connected three-level neutral-point clamped converter. The proposed cascaded-OSS-MPC strategy does not require a weighting factor to balance the dc-link capacitor voltage...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2019-12, Vol.34 (12), p.12464-12475
Main Authors: Mora, Andres, Cardenas-Dobson, Roberto, Aguilera, Ricardo P., Angulo, Alejandro, Donoso, Felipe, Rodriguez, Jose
Format: Article
Language:English
Subjects:
Algorithms
Capacitors
Computer simulation
Converters
Cost function
Dynamic response
Harmonic analysis
Model predictive control (MPC)
multilevel converter
optimal switching sequence (OSS)
Optimization
Predictive control
Strategy
Switches
Switching sequences
Voltage control
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Summary:In this work, a model predictive control (MPC) strategy based on optimal switching sequence (OSS) concepts is proposed for a grid-connected three-level neutral-point clamped converter. The proposed cascaded-OSS-MPC strategy does not require a weighting factor to balance the dc-link capacitor voltages and optimally controls both the grid currents and the capacitor voltages even during disturbances and large step changes in the references. The resulting MPC strategy allows operating the converter with a predefined harmonic spectrum, fixed switching frequency, and fast and robust dynamic response. Besides, an efficient optimization algorithm is also introduced to reduce the computational burden typically observed in this kind of MPC strategies. Experimental and simulation results are provided to demonstrate the effectiveness and high-quality performance of the proposed strategy.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2019.2906805