Full
Outline
Aiming at the problem of high harmonic content in the output current of traditional nearest level modulation in medium-sized modular multilevel matrix converter (M3C), the pulse width modulation (PWM) mode is introduced into the traditional nearest level modulation (NLM) strategy. And considering the reduction of switching losses and achieve the accurate conversion of submodule states, an improved nearest level pulse width modulation strategy for M3C is proposed to improve the harmonic characteristics of its output current. Compared with the traditional nearest level modulation strategy, the proposed strategy can effectively suppress harmonic components on the M3C output current under the premise of reducing the switching losses. The feasibility and effectiveness of the proposed strategy are verified by M3C simulation model and experimental platform.
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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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