Blade icing state identification method and apparatus for wind generator set

A blade icing state identification apparatus for a wind generator set, comprising:

• a processor;
• a memory configured to store instructions executable by the processor;
• and
• an interface configured to communicate with a farm-level energy management platform or a wind farm controller,
• wherein the processor is configured to:
• preset a wind speed threshold and a rotating speed threshold;
• instruct, via the interface, the farm-level energy management platform or the wind farm controller to use the rotating speed threshold as a lower limit value of a maximum limited rotating speed of the wind generator set operating under a limited power condition;
• periodically obtain a current wind speed and a current rotating speed of the wind generator set;
• compare the current wind speed and the current rotating speed of the wind generator set with the preset wind speed threshold and the preset rotating speed threshold respectively;
• progressively increase a blade icing possibility index having a preset initial value when conditions that the current wind speed is greater than the preset wind speed threshold and the current rotating speed of the wind generator set is smaller than the preset rotating speed threshold a met;
• progressively decrease the blade icing possibility index when said conditions are not met;
• and
• determine that blades are in an icing state when the blade icing possibility index is greater than a preset index, the preset index being a threshold for determining whether the blades are in the icing state,
• wherein the preset rotating speed threshold is greater than a minimum rotating speed of the wind generator set.