Design and Experimental Evaluation of Fast Model Predictive Control for Modular Multilevel Converters

In recent years, modular multilevel converters (MMCs) are very popular in medium/high-voltage motor drive systems and high-voltage direct-current (HVDC) applications. The conventional model predictive control (MPC) strategies for the MMC are not practical due to their substantial calculation require...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2016-06, Vol.63 (6), p.3845-3856
Main Authors: Gong, Zheng, Dai, Peng, Yuan, Xibo, Wu, Xiaojie, Guo, Guosheng
Format: Article
Language:English
Subjects:
Capacitors
circulating current control
computational burden reduction
Cost function
Mathematical model
Mathematical models
model predictive control (MPC)
Modular multilevel converter (MMC)
Sorting
Switches
voltage balancing
Voltage control
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Summary:In recent years, modular multilevel converters (MMCs) are very popular in medium/high-voltage motor drive systems and high-voltage direct-current (HVDC) applications. The conventional model predictive control (MPC) strategies for the MMC are not practical due to their substantial calculation requirements, especially under high number of voltage levels. To solve this problem, a fast MPC strategy combined with a submodule (SM)-voltage sorting balancing method is proposed based on the discrete mathematical model derived for the MMC in this paper. By optimizing the implementation of the control objectives and simplifying the rolling optimization, the proposed strategy is simpler to expand to a system with larger number of SMs, with the amount of calculation reduced and the advantages of the conventional MPC algorithm reserved. In addition, the proposed control can minimize the dv/dt of the output voltages. Both steady-state and transient performances are evaluated by a down-scaled three-phase MMC prototype under various experimental conditions, which validates the proposed fast MPC strategy.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2015.2497254