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

被引:9
作者
Ricco, Mattia [1 ]
Mathe, Laszlo [2 ]
Hammami, Manel [1 ]
Lo Franco, Francesco [1 ]
Rossi, Claudio [1 ]
Teodorescu, Remus [2 ]
机构
[1] Univ Bologna, Dept Elect Elect & Informat Engn, I-40136 Bologna, Italy
[2] Aalborg Univ, Energy Technol Dept, DK-9100 Aalborg, Denmark
来源
ELECTRONICS | 2019年 / 8卷 / 04期
关键词
modular multilevel converters; capacitor voltage balancing; nearest level control; sorting strategy; MODULAR MULTILEVEL CONVERTER; ALGORITHM;
D O I
10.3390/electronics8040449
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
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.
引用
收藏
页数:17
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