Control method of automatic lubrication system of variable-pitch bearing used for wind turbine

摘要

The present invention provides a control method of an automatic lubrication system of a variable-pitch bearing used for a wind turbine generator system (WTGS). The method comprises the following steps: calculating a current friction factor of the variable-pitch bearing using a current friction moment of the variable-pitch bearing of WTGS; determining a demand of lubrication grease according to the operation power of WTGS and the current friction factor of the variable-pitch bearing, wherein the friction factor of the variable-pitch bearing to be obtained is taken as an objective; customizing a lubrication control strategy according to the demand of lubrication grease, wherein a predetermined energy production of WTGS is taken as an objective; calculating lubrication target regions according to an average wind speed and a power of an wind turbine, the lubrication target regions being operation regions of the tooth surfaces of the variable-pitch bearing; meanwhile, calculating an angle difference between grease discharge points of a lubrication pinion and the lubrication target regions; moving the angle difference by an actuator of a variable-pitch system under the control of the main controller of the WTGS, and carrying out automatic lubrication according to the control strategy. The present invention has the advantage that good lubrication is realized for the variable-pitch bearing and variable-pitch tooth surfaces.