The certification of the grid characteristics of wind turbines has been mandatory for a long time, in order to maintain grid stability and voltage quality, as well as to obtain the grid connection permit. Ever faster product development cycles lead to time-intensive qualification and validation tests in the field. Voltage dip tests are particularly critical in this regard. Some years ago, the Fraunhofer Institute for Wind Energy Systems IWES set itself the goal of bringing grid integration tests into the laboratory to accelerate product validation.
Why are these tests important and how are they performed in the field?