Abstract: Wind turbine blade static test is an effective way to verify the blade structure strength. For the blade static test, the loading procedure is usually planed based on the undeformed geometry of blade. However, when the blade undergoes a large deformation, especially under the maximum flapwise load case, both the spanwise position and the load direction of the load point will change greatly, resulting in a mismatch between the test load and the given blade design load. So the structure strength of the blade may not fully verified in some areas during the test. This article proposes how to consider the effect of large blade deformation in the blade static test simulation model, and how to extract the load of each cross section after the blade large deformation. Besides, an equivalent beam model to accelerate the iteration process of the test loads is put forward. Finally, the full-scale blade test is carried out to verify the feasibility and the accuracy of the improved loading plan.

Key words: wind power blade, large deformation, static test, loading plan, composites