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The characteristics of zero moment of inertia of modular multilevel converter, it can not support the frequency fluctuation of AC power grid, so that the overall inertia of AC/DC hybrid system decreases, affecting the dynamic performance and stability of the system. Therefore, an improved powervoltage droop control combined with a virtual synchronous machine technology of coordinated control strategy, in the case of de voltage stability of ac power grid frequency adjustment, at the same time, reasonable allocation of power between the converter, in the case of without communication system to establish effective energy management system. In order to verify the feasibility and effectiveness of the proposed control strategy, a comparative test was conducted with the traditional double closedloop control. The results show that the proposed control strategy effectively solves the dynamic performance and stability problems of the system caused by low inertia and under damping.
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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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