Device and method for recognizing the accumulation or the type of ice on a rotor blade of a rotor of a wind turbine

摘要

A device and a method for recognizing the accumulation or the type of ice on a rotor blade (100) of a rotor of a wind power plant (200) are described. A natural frequency determining device is used to determine at least one natural frequency of the rotor blade (100) in a predetermined or predeterminable time period. A power determination device is used to determine an actual rotor power of the wind power plant (200) in the predetermined or predeterminable time period. An expected power determination device is used to determine an expected rotor power of the wind turbine (200) in the predetermined or predeterminable time period. An evaluation device is configured to carry out a detection of the accumulation of ice on the rotor blade (100) and / or a detection of the type of ice of ice deposited on the rotor blade (100) by combining the following: the determined natural frequency of the rotor blade (100); and a comparison of the actual rotor power with the expected rotor power of the wind turbine (200).