Control method for triggering variable pitch action instruction of wind driven generator according to mean value

• Main Authors: FAN YING, ZHAO XUEHAO, XIA ZIPENG
• Format: Patent
• Language: English
• Published: 26.08.2015
• Subjects: BLASTING; HEATING; LIGHTING; MACHINES OR ENGINES FOR LIQUIDS; MECHANICAL ENGINEERING; OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR; PRODUCING MECHANICAL POWER; WEAPONS; WIND MOTORS; WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS

The invention discloses a control method for triggering a variable pitch action instruction of a wind driven generator according to a mean value. According to a variable pitch control policy for the case that the wind speed fluctuates up and down around the rated wind speed of the wind driven generator, when a variable pitch system detects that the rotating speed, the output power or the wind speed of the generator is higher than the rated value, the variable pitch system starts acting to adjust the pitch angle of a fan paddle and reduce the fan capture power so as to keep the output power of the wind driven generator stable. The past control methods only concentrate on stable control on the output power; however, due to the randomness and instability of wind, the wind speed is possible to fluctuate up and down around the rated wind speed of the wind driven generator and the rotating speed and the power of the wind driven generator also fluctuate up and down around the rated values, and consequently, the variable pitch system is leaded to frequent actions to result in fatigue loss of the variable pitch system. The invention provides a wind driven generator variable pitch control method base on a mean value algorithm, and the control method is capable of greatly improving the action smoothness of the variable pitch system, reducing the fatigue loss and improving the reliability of the system.