the beginning of the critical overvoltage furthermore an active module 66 is provided which is in the form of an additional activation module for the chopper 32 in this case the chopper 32 is activated in the overvoltage range iii therefore the active power is reduced in comparison with the grid while the generator 2 in the wind turbine can operate continuously and feeds the power generated thereby into the chopper therefore relieving of load on the generator 2 can be avoided preferably the module 66 interacts with the active module 61 to be precise in such a way that the chopper 32 is connected by the active module 66 in particular in the event of the occurrence of additional dynamic active power in the overvoltage range this is visualized in fig6 by the dashed lines in the overvoltage range iii in the graphs shown in fig1 a c the interaction of the active modules 61 to 66 is illustrated the continuous lines represent the resulting voltage profiles in the case of an overvoltage on the grid in each case for the case of off load operation central continuous characteristic a case with 110 active power and 50 overexcited reactive power the continuous line at the top annotated by u201c cap u201d and the case of an active power of 110 and 50 underexcited reactive power in each case based on the rated values continuous line at the bottom annotated by u201c ind u201d in this case the graph in fig1 a shows the initial state without any activity of the active modules it can be seen from fig1 b and c that owing to the effect of the active.