Method of operating a variable speed wind turbine

Method of operation of a variable speed wind turbine (11) comprising control means for a standard regulation tracking a power vs. generator speed curve (21) that also uses an alternative regulation for optimizing the energy production along determinate time periods T b for compensating previous energy losses at a higher power P b than the power determined by said standard regulation, said alternative regulation being based on a continuous calculation of the accumulated lost energy ALE as the energy lost with respect to the maximum allowed energy production according to the standard regulation and on a setting of said higher power P b and a setting of the duration of said time periods T b being compatible with wind turbine electrical or mechanical limitations. The invención also refers to a wind turbine controlled by said method.