Calculation of Extreme Coherent Gust with Direction Change


Direction Change,Extreme Coherent Gust,High turbulence,Low turbulence,Wind Turbine Generator System,Standard variation of main wind direction speed at hub height,Amplitude of Extreme Operating Gust for Return Period,Extreme Operating Gust,Slope parameter of Normal turbulence model,Turbulence Intensity in the case that 10 minutes average standard wind speed of 15(m/s) at hub height,Roter Diameter,Hub height,Parameter of Extreme wind direction change model,10 minutes average wind speed at Hub height.


[1]:Japanese Industrial Standards Committee:『Wind turbine generator systems-Part 1 : Safety requirements』,JISC1400-1:2001


・θcg:Angular Deviation from average wind direction in Gust.
・θ(t):Transient change of Wind direction.
・Vref:Reference speed of 10 minutes average.
・Vcg:Amplitude of Extreme coherent gust in all rotor area.
・Vhub:10 minutes average wind speed at Hub height.
・LaTex: \\\theta _{cg}\left ( V_{hub} \right )\\=\begin{cases} & 180^{\circ},\text{ if } V_{hub}< 4_{m/s} \\ & 720/V_{hub},\text{ if } 4_{m/s}\leq V_{hub}\leq V_{ref}\end{cases}\\\\\theta \left ( t \right )\\=\begin{cases} & 0^{\circ},\text{ if } t< 0 \\ & \pm 0.5\theta _{cg}\left ( 1-\cos\left (\frac{\pi t}{T} \right ) \right ),\text{ if } 0\leq t\leq T \\ & \pm \theta _{cg},\text{ if } t> T \end{cases}
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