Simplified Indirect Model Predictive Control Method for a Modular Multilevel Converter

Demand for modular multilevel converters (MMCs) has been steadily increasing for utilization in medium- to high-power applications because of qualities such as high modularity, easy scalability, and superior harmonic performance. Furthermore, there has been a growing trend toward utilizing model pre...

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Bibliographic Details
Published in:IEEE access 2018, Vol.6, p.62405-62418
Main Authors: Nguyen, Minh Hoang, Kwak, Sangshin
Format: Article
Language:English
Subjects:
Alternating current
Capacitors
circulating current
computational load
Control methods
Converters
Cost function
Dynamic response
Metal matrix composites
Model predictive control (MPC)
modular multilevel converter (MMC)
Modularity
Predictive control
preselection
Sorting
Sorting algorithms
Switches
Voltage control
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Summary:Demand for modular multilevel converters (MMCs) has been steadily increasing for utilization in medium- to high-power applications because of qualities such as high modularity, easy scalability, and superior harmonic performance. Furthermore, there has been a growing trend toward utilizing model predictive control for MMCs due to its simplicity, good dynamic response, and ease of multi-objective control. However, the rise in computational load leads to a great drawback when increasing the number of submodules (SMs). This paper presents an approach to reducing the computational load and using on-state SMs and circulating currents, by preselecting the number of SMs inserted in the upper and lower arms. This approach is based on using the number of on-state SMs and the circulating current, to compute the number of SMs inserted in the upper and lower arms, which is evaluated in the next sampling instant. This facilitates a significant reduction in the number of control options and the computational load. A sorting algorithm is used to retain the balancing capacitor voltages in each SM, while the cost function guarantees the regulation of the ac-side currents, arm voltages, and MMC circulating currents. Simulation and experiment results validate the performance of the proposed approach.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2018.2876505