Full
Outline
To meet the requirement of lightweight design for modular multilevel converters (MMCs), the unified structure of arm-multiplexing-type MMCs based on a single-arm multiplexing MMC (SAM-MMC) is summarized. Then, a dual-arm multiplexing MMC (DAM-MMC) is proposed, and the corresponding structure of arm selection switch, modulation strategy and low-voltage switching strategy in multiplexing mode are designed. The DAM-MMC requires a total of 4N in three phases, with a submodule utilization rate of 75%. Through the analysis of arm energy fluctuations, the capacitance in multiplexing arms of the DAM-MMC is reduced by about 31.9% compared with that of the SAM-MMC, and the capacitance in upper and lower bridge arms is reduced by about 11.5%, which further reduces the volume, weight and cost of the converter. Based on an experimental prototype, the feasibility of the DAM-MMC topology, parameter design and proposed strategies was verified.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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