风能密度

与此同时，黑龙江省风能资源丰富区在主导风向的风能密度表现为高值特征，而在其它非主导风向的风能密度，则表现为低值。

At the same time , the rich wind energy region shows high value in the map of wind power density about the dominant wind direction , while the area show low value in other wind direction .

在浙江南部海域风能资源最为丰富，其年平均风能密度最大可达500W/m2。

The region richest in wind energy resources is located in south sea of the Zhejiang coast , and the largest wind power density can reach500W / m2 .

用WⅡ模型和WⅢ模型估算风频和风能密度的比较

The comparision between w - ⅱ model and w - ⅲ model for estimating wind frequency and wind power

利用Weibull统计模型可计算出平均风能密度.有较风能密度和风能可利用时数。

In weibull statistical model , average energy density , efficient energy density and utilizable hours of wind can be calculated easily .

全省有效风能密度Wc≥150W/m~2，有效风速时间Te≥4000小时的地区约占总面积的50%，达到全国风能较丰富区的水平。

There are about 50 % area in the Province which We ( Density of wind energy ) > 150W / m ~ 2 and Te ( Time of effective wind speed ) > 4000Hr . Yunnan is rich in wind energy resource .

广东沿海某风电场风能密度计算

Calculate the Wind Energy Density of Coastal Wind Farm in Guangdong

通常风速、平均风能密度和有效利用时间随海拔的上升而增大。

Usually , the parameters , such as wind speed , energy density and effective time , increases with higher elevations .

采用风速的韦布尔双参数方法测算出平均风能密度、平均有效风能密度，以及年风能可利用时间。

The mean wind energy density , mean effective wind energy density and annual available time of wind energy are calculated by using Two-Parameter Weibull Distribution function of wind speed .

研究表明：在南京地区近地层100米以下，用W&Ⅱ模型估算风频和风能密度是简便而可靠的方法。

The result shows it is a simple and reliable method that wind frequency and wind power are estimated using w - ⅱ model within the reach of 100M . above ground over Nanjing region .

最后给出四张分布图（有效风能密度和出现百分率及≥3米/秒，≥6米/秒出现小时数），并描述了它们的特征。

In order to delineate the feature of its distribution , lastly , the maps of the density of effective wind power , its percentage of time , and the occurred hours of ≥ 3m / s and ≥ 6m / s winds were made .

通过运用威布尔函数，对如东沿海地区的风速数据进行分析，计算了该地区70m高度处的风速分布特性和风能平均功率密度。

The wind speed distribution and average wind power density at the height of 70 m in the coastal areas of Rudong are analyzed by using Weibull function .

由于风能的能量密度低，具有不稳定性和随机性，控制技术是大型风力发电机组安全高效运行的关键。

Because wind energy has lower density , instability and randomicity , control is vital for safety and efficiency of a large-scaled wind turbine .

由于风能具有能量密度低、随机性和不稳定性等特点，风力发电机组是复杂多变量非线性不确定系统，因此，控制技术是机组安全高效运行的关键。

Control is crucial to the efficiency and reliability of wind turbines . Wind energy has lower density , instability and randomicity . Wind turbines have strong nonlinear multivariable with many uncertain factors and disturbances .

但是太阳能和风能都具有能量密度低、稳定性差、受气象和环境等因素影响较大的缺点；燃料电池虽然能够提供不间断电能输出，但是发电成本过高。

However , solar energy and wind energy have disadvantages of low energy density , poor stability and influenced by weather and environmental factors . In addition , although the fuel cell output is stable , the high cost is also the character of it .