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For wind power units, both torque control and pitch control are designed based on generator speed, which leads to the coupling between them near the rated speed, further resulting in rotational speed disturbances. Consequently, conventional torque control will frequently change the control logic according to generator speed, thereby causing the torque and power dips. Besides, two kinds of conventional torque control strategies above the nominal wind, constant-torque and constant-power control, have advantages and disadvantages in torque, power and drive-train loads. In order to eliminate the torque and power dips, full load curve was extended to generator speeds below the rated value. Several state variables, relevant to pitch angle, were selected to reduce the frequency of switching the torque control regions near the rated speed. A new full load curve was designed based on weight programming to comprehensively consider the power and torque performances. The transition curve connecting the optimum Lambda curve and full load curve, was optimized dynamically. Moreover, the proposed control strategy was tested under typical turbulent wind conditions. The simulation results show that, the torque and power dips at above nominal wind are eliminated and the power capture increases at rated wind by using the improved torque control strategy. Furthermore, both torque and power achieves good performance by applying the rational weight.
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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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