Abstract: An electric power generating device comprising a wind power plant 1 with a rotatably turbine shaft 2, a generator 3 connected to a power grid 5, means for rotating the turbine shaft within the generator thus generating AC electrical power, a plurality of frequency converters 4 for converting the frequency of the AC electrical power to the frequency of the power grid, wherein the plurality of frequency converts are electrically connected in parallel in between the generator and the power grid wherein the power generating device further comprises means 48 for registering the amount of power generated in the generator, and means 10 for registering data in the form of the temperature and utilization of each frequency converter respectively, and means for using the registrated data for automatically bringing each of the frequency converters online sequentially and/or means for automatically alternating the order in which the frequency converters are brought online.