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Strong and weak wind turbines

 

The differentiation in turbines for locations with better wind conditions (strong WTs) and locations with less beneficial conditions (weak WTs) can be seen in the average specific power per square meter of rotor area for the respective wind zones, and on the basis of different growths in tower heights. The following figure shows the graph over time of the average of these parameters in the four different DIBt wind zones. Installation types are selected in line with the wind conditions prevalent at the locations. Overall, a trend towards lower specific nominal power is evident for all wind zones. With a difference of over 100 W/m² between wind zones I and IV, the different specifications of projects is clearly evident.

 

 

Highcharts Example
sourcedata for image

 

Data source: [Keiler und Häuser]; [DIBt]

 

 

 

There is also a corresponding trend for hub height. Expressing it in proportion to the nominal power of the respective WT also enables a specific nominal power [kW/m] to be determined. As would be expected, this is far higher in wind zone IV than in wind zone I. The trend towards this overall growing specific nominal capacity per meter of hub height is conditional upon the simultaneously increasing rotor diameter, having a quadratic effect on the power attainable in theory.

The reasons for the different trends are the extremely different wind conditions at different locations. At the coast, installations with high capacities and relatively short rotor diameters are built - because good wind conditions mean high utilization of installations can be achieved. In low mountainous areas and the lowlands of northern Germany, installations are often in regions where wind conditions are negatively influenced by obstacles such as forested areas. To utilize available wind resources to the greatest possible extent, installations with lower nominal capacities and greater dimensions are deployed here.

 

 

 

Highcharts Example
sourcedata for image

 

Data source: [Keiler und Häuser]; [DIBt]