Bewertung von Schalthandlungen

With the new revision No. 10 [1] of the German guideline for power quality measurements wind turbines the grid dependent current spike factor kiy is introduced in addition current spice factor kimax. The grid dependent current spike factor evaluates change and the Flicker behaviour during switching operations in dependence on the angles. With this kiy- factors given in a table for grid impedance angles y from steps of 5°, a more accurate evaluation of the grid distribution during switching operations is possible. The grid dependent current spike factor kiy is defined for time intervals of T = 92 s and for flicker limits of Ast = 0,2. For other limitations the kiy- factor is inflexible. In the following it is shown, how the kiy factor is calculated, how it is measured and how it is used at a single wind turbine or at a wind farm.