A wind
turbine or rotor load control compensates for moment imbalance in a wind
turbine that includes a rotor having at least two variable
pitch blades. The apparatus includes a conventional
pitch command logic developing a nominal rotor
blade pitch command
signal and a moment sensor. The moment sensor can be one or more of a
nacelle overturning moment sensor, and a turning moment sensor. An output of this is used as a moment
signal. Conversion logic is connected to the moment
signal with an output of the conversion logic being calculated individual
pitch modulation commands for each of the blades. A combining logic is connected to receive the calculated individual
blade pitch modulation commands and to receive a nominal pitch command. An output of the combining logic is individual combined
blade pitch commands for each of the blades. The individual combined blade pitch commands are generated by modulating the nominal command signal by a respective blade pitch modulation command which includes compensation for instantaneous moment deviations of the wind
turbine.