The objective of this project is to investigate into the consequences of the new grid connection requirements for the fatigue and extreme loads of wind turbines.
The goal is also to clarify and define possible new directions in the certification process of power plant wind turbines, namely wind turbines, which participate actively in the stabilisation of power systems. Practical experience shows that there is a need for such investigations.
The grid connection requirements for wind turbines have increased significantly during the last 5-10 years. Especially the requirements for wind turbines to stay connected to the grid during and after a voltage sag, imply potential challenges in the design of wind turbines.
These requirements pose challenges for the design of both the electrical system and the mechanical structure of wind turbines.
An overview over the frequency of grid faults and the grid connection requirements in different relevant countries will be done in this project. Different wind turbine concepts with their control strategies for operation during and after grid faults will be considered in these investigations.
Iov, F.; Hansen, A.D.; Sørensen, P. E.;Cutululis N.A., Mapping of grid faults and grid codes. Risø-R-1617(EN)2007
Hansen A.D.; Cutululis N.; Sørensen P. E.; Iov, F.; Larsen, T. J., Simulation of a flexible wind turbine response to a grid fault, EWEC 2007, Milano.
Hansen A.D.; Cutululis N.; Sørensen P. E.; Iov, F.; Larsen, T.J., Grid faults’ impact on wind turbine structural loads, accepted to NWPC 2007.
Iov, F.; Hansen, A.D.; Sørensen, P. E.; Cutululis, N.A., A survey of interconnection requirements for wind power, accepted to NWPC 2007
The effect of grid fault on the wind turbine structure is assesed by using a combination of two complimentary simulation tools, namely DIgSILENT and HAWC2, in order to asses both the electrical and the flexible structural aspects of the wind turbine response during grid faults.
Click to enlarge illustration
The project focus on the quantification of the loads’ impact on the wind turbines’ lifetime. The main goal of this project is the development of a procedure for the evaluation of the consequences of grid faults on the wind turbines’ loads. This procedure will be used directly in the certification of wind turbines.
Period: 2006 - 2009
Anca D. Hansen, Risø National Laboratory
Poul E. Sørensen, Risø National Laboratory
Nicolaos Cutulis, Risø National Laboratory
Florin Iov, Aalborg University