风向变化速度对风力机功率及转速的影响

In order to explore the effect of wind direction change on power and speed of wind turbine, 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 IEC61400. One wind direction change speed was selected every 1°/s, that is, five wind direction changes were selected as wind speed, i.e. 1°/s, 2°/s, 3°/s, 4°/s 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. The output power of the wind turbine has a small amplitude at the beginning of wind direction change, and continues to fluctuate for about 3 s before it starts to decline. The output power and speed of the wind turbine need to continue to run for a period of time to reach a stable value after the wind direction change. 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.