Full
Outline
The connection of distributed generations to DC grid can improve the consumption level of new energy. In view of the fact that the doubly-fed wind turbine is connected to medium-voltage DC grid through a diode uncontrolled rectifier, a wide-frequency operation control method is proposed, which can limit the rotor-side feed power in the whole wind speed range and further greatly reduce the cost of a rotor-side converter. When the wind speed and rotational speed are high, the stator frequency is properly increased, and the rotor-side power is limited to a small constant power with a certain negative slip. When the wind speed is low, the rotor-side power is operated at a constant stator frequency lower than the power frequency, so as to make the slip rate change positively or negatively in a small range and limit the absolute value of rotor-side power accordingly. A simulation example is taken, in which the absolute value of rotor-side power of a 1.5 MW doubly-fed wind turbine is limited within 140 kW in the full wind speed range, and results verify the effectiveness of the proposed wide-frequency operation control method in reducing the capacity of the rotor-side converter. Finally, the feasibility of the proposed wide-frequency operation control technology was verified through a laboratory-scale experimental platform of 5.5 kW doubly-fed unit connected to DC grid with uncontrolled rectifier.
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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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