Full
Outline
In the event of a short-circuit in the AC system where the modular multilevel converter-unified power flow controller (MMC-UPFC) is located, both the series and shunt-side MMCs will be impacted by the fault and be blocked due to overcurrent, leading to the complete shutdown of the MMC-UPFC. The fault characteristics of the AC system where the MMC-UPFC is located are analyzed. It clarifies the main reasons for the overcurrent blocking of the shunt-side MMC. Based on this analysis, a fault ride-through strategy for MMC-UPFC is proposed, which is based on a distributed current limiting module. The working principle of this strategy is analyzed in detail, and the guidelines of its parameter tuning are given. The proposed fault ride-through strategy can effectively suppress the DC bus current by inserting a current limiting resistor during the fault period. This ensures that the shunt-side MMC is not blocked during the fault period, allowing it to continue generating reactive power. Finally, simulations in MATLAB/Simulink are used to verify the effectiveness of the proposed fault ride-through strategy and the correctness of the parameter tuning guidelines.
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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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