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Strong and Weak Wind Turbines

 

The differentiation between locations with better wind conditions (strong wind turbines) and locations with less favourable conditions (weak wind turbines) can be found in the average specific output per square metre of rotor area for the respective wind zones as well as in the different development of tower heights. The following figure shows the development over time of the mean value of this parameter in the four different DIBt wind zones. The turbine types are selected according to the wind conditions prevailing at the sites. Overall, a trend towards lower specific rated outputs can be seen for all wind zones; with a difference of more than 100 W/m² between wind zones I & IV, the different design of the projects is clearly discernible.

 

On average, the specific rated output of the wind turbines installed in 2018 was 308 W / m² (309 W / m² in 2017). In wind zone I, the wind turbines have on average the lowest specific rated output with 283.5 W / m², in wind zone IV with 444 W / m² the highest. Wind zones II and III are in between with 296 W / m² and 316 W / m² respectively. While the specific rated output in wind zone III continues to fall, wind zones I and II have settled at a low level. The sharp increase in the specific rated output in wind zone IV is due to the increased use of strong wind turbines at these locations. The three turbine types most frequently installed in this wind zone (E-126 7.6 MW, E-82 2.3 MW and E-70 2.3 MW) are all strong wind turbines.

 

Highcharts Example
Data source for image

 

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

 

 

A corresponding development can also be seen in the hub height. In relation to the rated power of the respective WTG, a specific rated power [kW/m] can also be determined. As expected, the ratio of 36.6 kW/m in wind zone IV is significantly higher than 20.2 kW/m in wind zone I. Wind zones II and III are in between with 25.4 kW / m and 28.4 kW / m respectively. Overall, the increase in output exceeds the increasing hub height, which means that the key figures increase slightly in most wind zones. Due to the addition of strong wind turbines, wind zone IV also shows a particularly strong increase here.

 

The reason for the different developments is the extremely different wind conditions at the different locations. On the coast, turbines with large capacities and relatively small rotor dimensions are usually built, since the good wind conditions can already achieve a high capacity utilization of the turbines. In the low mountain ranges and in the North German Plain, the turbines are often located in areas where wind conditions are negatively influenced by obstacles such as forest areas. In order to make the best possible use of the available wind resources, turbines with lower outputs and larger turbine dimensions are used here.

 

 

 

Highcharts Example
Data source for image

 

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