Adaptive control of a wind turbine by detecting a change in performance

A controller for a wind turbine is disclosed, comprising: a processor; an input/output interface; and a memory including instructions that, when executed by the processor, cause the processor to: i) select a setting xi from a list of settings X1, . . . , XN; ii) operate the turbine according to setting Xi for a period of time t1; iii) record a power output signal over t1; iv) repeat steps i) to iii) for another setting in Xi, . . . , XN until all N settings have been used; v) repeat steps i) to iv) for a number of cycles c; vi) calculate a summarised power output for each setting over all cycles; and vii) compare the summarised power outputs across settings and determine whether any setting X* results in a higher power output than other settings tested. A method of identifying power production improvements in a wind turbine, a computer program, and a wind turbine are also disclosed.