The National Development and Reform Commission has documents that stipulate that wind power investment projects with a total installed capacity of more than 50MW need to be submitted to the National Development and Reform Commission for approval. Projects below 50MW can be approved by the provincial Development and Reform Commission. Wind farms under construction are now generally 33 units*1.5 MW, the Provincial Development and Reform Commission has solved this problem, mainly because the approval process is relatively fast.
The largest one is 5MW, one in Denmark and one in China. Generally, 2MW, 1.5MW, or smaller 0.8MW are used in China.
Electrical power calculation formula: P=W/t =UI.
In a purely resistive circuit, according to Ohm's law U=IR and substituted into P=UI, we can also get: P=I2R=(U2)/R.
In dynamics: Power calculation formula: P=W/t (average power); P=FV; P=Fvcosα (instantaneous power).
Extended information
When the wind turbine generates electricity, it must ensure that the output frequency is constant. This is very necessary for both wind turbine grid-connected power generation and wind-solar hybrid power generation. ?
To ensure that the frequency of wind power is constant, one way is to ensure a constant speed of the generator, that is, a constant speed and constant frequency operation mode. Because the generator is driven by the wind turbine through the transmission device, this This method undoubtedly requires constant speed of the wind turbine, which will affect the conversion efficiency of wind energy.
Another way is to change the generator speed with the wind speed and ensure the frequency of the output electric energy to be constant through other means, that is, variable speed constant frequency operation. The wind energy utilization coefficient of the wind turbine is related to the blade tip speed ratio (the ratio of the linear speed of the impeller tip to the wind speed). There is a certain blade tip speed ratio that makes Cp reach the maximum value.
Baidu Encyclopedia-Wind Turbine