4-Rotor Concept Turbine

A special wind turbine is situated at DTU Risø Campus. It is a 4-rotor Concept Turbine from Vestas. The names refers to the fact that it has four rotors instead of the usual one rotor, which we know from other turbines of today.

The 4-rotor Concept Turbine is a part of research into whether the cost of wind energy can be more competitive by delivering a larger production of electricity and reducing the weight concurrently. Researchers from DTU Wind Energy are contributing with counselling and metrological services.

The motivation behind the turbine is thus reducing the cost of electricity. This is to be done by reducing the consumption of materials and using smaller components for the turbine. The smaller parts are visible at the small blades of the turbine. In general, through the last decades, turbines have grown larger resulting in bigger challenges regarding logistics and handling of the components. The larger the turbines are the more materials are being used. In spite of the height of the concept turbine of just 74 meters, it has got a capacity of 900 kW.

Background
When doubling the size of a turbine, the area which the rotating blades are covering will get four times as big. In that way the electricity generation will increase fourfold. However, there is another side of the coin: The total weight of the blades is increasing as well as the weight of the other mechanical components. The increased weight comes from an increased material consumption resulting in higher total costs of the turbine. By constructing a turbine like the 4-rotor Concept Turbine with more and smaller components a lower weight is achieved, just as it gets easier to handle the turbine and the components.

This is an advantage e.g. when the components of the turbine are to be transported to markets where the necessary infrastructure has not been developed yet.

At spring 2017, a number of tests are going to be conducted at DTU’s test site at DTU Risø Campus. These tests will contribute to deciding whether turbines like the 4-rotor Concept Turbine are considered cost-effective at a future turbine market. The vision is to further strengthen the competitiveness of wind power compared to other sources of energy.

 

Contact

Søren Oemann Lind
Chief Engineer
DTU Wind Energy
+45 93 51 13 76