System and method for detecting misalignments in the pitch of one or more blades of a wind turbine

The present invention relates to a system (1) for detecting misalignments in the pitch of one or more blades (104) of a rotor (103) of a wind turbine (100) during its operation, comprising: - one or more fixed sensors (2), associated with a fixed portion of the wind turbine (100) comprising a pylon (101) extending in height along a fixed axis x perpendicular to a fixed plane defined by fixed axes y-z, and capable of detecting a momentum or angular acceleration or acceleration along said fixed axes y and/or z and providing representative signals thereof; - a control unit (3) configured to receive as input signals provided by said fixed sensors (2), calculate the frequency spectrum thereof, and determine the presence of a misalignment in the pitch of at least one of the blades (104) if the frequency spectrum of at least one of said signals from said fixed sensors (2) exhibits a peak at the rotor rotation frequency (fr). The present invention further relates to a method for detecting misalignments in the pitch of one or more blades (104) of a rotor (103) of a wind turbine (100) during its operation.