By using ASR a lot of advantages are gained that a normal stall regulated wind turbine cannot offer:
- ASR will generally give a higher production because the blade angle is optimized according to the actual wind speed;
- At high wind speed the power is stabilized because problems with air density changes, double-stall and change in grid frequency are eliminated. This means that stand still due to overproduction is avoided, and that the loads on individual components, i.e. gearbox and generator is minimized, resulting in a longer lifetime;
- The possibility of feathering the blades at extreme wind speeds means that the characteristic extreme loads are decreased compared to a normal stall regulated turbine;
- It is possible for the turbine to down-regulate the produced power if the local grid has high loading. However, this demands a special unit for grid surveillance;
- With blade regulation it is possible to make a much smoother cut-in to the grid at startup, and cut-out at shut down. This will give much less noise on the grid in these situations and at the same time extend the lifetime of the turbine;
- The possibility of reducing the power by feathering of the blades means that the switch over between the small and the large generator is taking place in a quiet and gentle manner;
The ASR system is under constant development and optimization i.e. through R&D activities supported by The Danish Energy Agency and the European Commission.
The wind turbine manufacturers know that the future in design of more efficient and more reliable wind turbines lies in the development of better control strategies and more effective blades. Using ASR the NORWIN turbine is in front in both areas - today and in the future. With the wind turbine as the centre, a long-term research and development program on the ASR controller is being conducted. Some of this work is made with co-financial support from the European Commission's R&D programmes. It is worth noting that not only the next generations of NORWIN turbines will benefit from this work. The wind turbines produced today can be upgraded with newer versions of 'intelligence'.