Patent ID: 8677810

Claim:
Monitoring method of a variable speed wind turbine ( 11 ) comprising control means for a pitch regulation tracking a power vs. generator speed curve ( 21 ) in function of the wind speed expressed by a transfer function (TF) applied to the wind speed measured by a wind sensor placed in a location where the wind flow is disturbed, characterized in that it comprises the following steps: a) providing an optimum relationship function (F1) between a wind speed dependant variable (V) and a wind turbine performance variable (P); b) measuring continuously said wind speed dependant variable (V) and said wind turbine performance variable (P) and obtaining a relationship function (F2) between them; c) obtaining continuously a parameter (D) indicative of the differences between said relationship functions (F1, F2); d) generating a warning message when the value of said parameter (D) is greater than a predetermined value.