Full
Outline
In practical engineering, the issues of large equipment volume and high operating costs increasingly highlight the demand for lightweight modular multilevel converters (MMCs) in new power systems. The arm multiplexing MMC (AM-MMC) can improve the utilization of submodules and effectively achieve lightweight MMC. However, due to its complex topology and susceptibility to fluctuations in internal energy caused by the changes in operating conditions, the energy fluctuations are more severe and even prone to reuse errors, especially in the event of AC system failures, increasing the requirements for the AC fault ride-through capability of AM-MMC. For the three-phase short-circuit fault of the AC system under the most serious fault condition, the fault characteristics of the converter after the fault are analyzed, and an optimal configuration strategy for the fault capacitor based on a fast blocking mechanism is proposed. During the fault period, the multiplexing mode adjustment and the fast blocking are carried out simultaneously to realize the fault ride-through of the AM-MMC after the three-phase short-circuit of the fault ride-through AC system. Finally, to validate the proposed strategy, a singleended simulation model was constructed using MATLAB/Simulink. Simulation results demonstrate that re-locking the converter after switching the multiplexing mode can effectively resolve the three-phase short-circuit fault ridethrough issue in the AM-MMC.
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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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