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A Capacitor Voltage Balancing Approach Based on Mapping Strategy for MMC Applications

1
Department of Electrical, Electronic, and Information Engineering, University of Bologna, 40136 Bologna, Italy
2
Energy Technology Department, Aalborg University, 9100 Aalborg, Denmark
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(4), 449; https://doi.org/10.3390/electronics8040449
Received: 20 March 2019 / Revised: 13 April 2019 / Accepted: 15 April 2019 / Published: 19 April 2019
(This article belongs to the Section Power Electronics)
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Abstract

This paper proposes a new strategy to achieve balanced capacitor voltages in modular multilevel converters. Among the possible solutions, centralized arm control approaches are often adopted. These methods require a balancing technique based on a sorted list of the sub-modules according to their capacitor voltages. In order to achieve the aforementioned sorted list, different algorithms have been proposed in literature, such as: Sorting algorithms, max/min approaches, etc. However, the sorting algorithms require a long execution time, while the max/min approaches affect the converter dynamic response during faults. To overcome these issues, a new mapping strategy providing a quasi-sorted list is proposed in this paper. The suggested method is compared in simulation with both the classical bubble sorting algorithm, and the max/min method during both normal and faulty conditions. Moreover, the three methods have been implemented in a Xilinx Zynq-7000 System-on-Chip (SoC) device, in order to analyze the corresponding execution time and the required computational effort. Hardware-in-the-loop results are presented for demonstrating the superior performance of the proposed balancing strategy. View Full-Text
Keywords: modular multilevel converters; capacitor voltage balancing; nearest level control; sorting strategy modular multilevel converters; capacitor voltage balancing; nearest level control; sorting strategy
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Ricco, M.; Mathe, L.; Hammami, M.; Franco, F.L.; Rossi, C.; Teodorescu, R. A Capacitor Voltage Balancing Approach Based on Mapping Strategy for MMC Applications. Electronics 2019, 8, 449.

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