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Aiming at the problem of large switching loss of modular multilevel converter（MMC），starting from the switching frequency optimization strategy，the existing switching frequency optimization strategy was improved，and the accurate analytical formula of sub-module capacitor voltage based on the real-time value of MMC transmission power was derived，so as to calculate the fluctuation range of the mean value of capacitor voltage.The dynamic retention factor was obtained by using the margin between the mean value of capacitor voltage and the engineering constraint，and the final output switching instruction was realized by the main flow of the equalization strategy.The PSCAD/EMTDC model was built based on the offshore wind power flexible engineering parameters to verify and compare the proposed strategy with the traditional strategy.The simulation results show that under the premise of meeting the requirements of the project on the fluctuation range and the imbalance index，the switching frequency of the proposed strategy is reduced by 49%~58% compared with the traditional strategy under each steady-state condition，and the switching loss is reduced by 63%~90% under each steady-state condition，and the expected loss reduction effect is achieved.
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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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