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| Effect of wind direction changing speed on power and speed of wind turbine |
| DU Yunchao1,WANG Jianwen1,2*,WANG Yingzheng1,ZHANG Jianwei1,YAN Sijia1 |
| 1. College of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot, Inner Mongolia 010051, China; 2. Key Laboratory of Wind and Solar Energy Utilization Mechanism and Optimization of Inner Mongolia Autonomous Region, Hohhot, Inner Mongolia 010051, China |
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Abstract In order to explore the change of wind turbine output power when the wind direction changes, an S-airfoil three blade horizontal axis wind turbine was taken as the research object. The rotating platform was used to simulate the process of uniform change of wind direction. The upper limit is the speed of extreme wind direction angle change of 5 °/s specified in IEC-61400. One wind direction change speed was selected every 1°/s, that is, five wind direction changes were selected as wind speed, i.e. 1, 2, 3, 4 and 5 °/s, to study the variation of wind turbine output power and speed under different wind speeds. The results show that the output power and speed of the wind turbine show a fluctuating downward trend under different wind speeds. The results show that the output power and speed of the wind turbine fluctuate and decline under different wind speeds, the greater the wind direction speed changes at the same wind speed, the faster the decline rate, but the lower the corresponding decline amplitude in the process of wind direction change; there is a hysteresis phenomenon at the beginning and end of wind direction change, and the output power of the wind turbine has a small amplitude at the beginning of wind direction change after the wind direction changes, the output power and speed of the wind turbine need to continue to run for a period of time to reach a stable value. The greater the speed of wind direction changes, the longer the delay time, the greater the initial tip speed ratio, and the greater the final stable value.
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Received: 12 March 2021
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