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Outline
During the fault recovery phase of a direct-drive wind turbine, the delayed withdrawal of reactive current leads to transient overvoltage of the turbine after the fault recovery, which affects the safe and stable operation of the grid-connected system. In order to suppress the transient overvoltage, an electromagnetic transient model for the direct-drive wind turbine is established, the mechanism of transient overvoltage occurrence is quantitatively analyzed, and a three-stage coordinated control strategy is proposed. The first stage optimizes the active/reactive current during fault ride-through to reduce the active/reactive power fluctuations before and after fault recovery; the second stage introduces the rate of change of terminal voltage to assist in accurately identifying the fault clearance and accelerating the reactive current withdrawal speed. The third stage controls the wind turbine to proportionally absorb reactive power, eliminating the accumulated reactive power surplus. Furthermore, a simulation platform based on MATLAB/Simulink and Speedgoat is built to verify the suppression effect of the proposed strategy on the transient overvoltage after fault recovery. Simulation and experimental results show that, compared with traditional control strategies, this strategy reduces transient overvoltage by 9.3% without sacrificing the reactive power support capability of the wind turbine.
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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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