Power limiting control method for variable speed constant frequency wind turbine generator and capable of reducing variable pitch frequency

Abstract

The invention discloses a power limiting control method for a variable speed constant frequency wind turbine generator and capable of reducing the variable pitch frequency. According to the method, a rotation speed critical decrease variable is introduced into a variable pitch controller, characteristics of a wind turbine are fully utilized, the unbalanced power is adjusted through kinetic energy of a wind wheel preferably, the action mechanism of a variable pitch system is optimized, and the problem that a variable pitch mechanism acts frequently in the high-air-speed stage is effectively solved. According to the method, by changing the decrease action value of the variable pitch system, the unbalanced kinetic energy is released or absorbed through the wind wheel of the wind turbine preferably, the action frequency and action amplitude of the variable pitch system can be effectively reduced on the premise that the target power output of the wind turbine is met, and accordingly the mechanical fatigue of the variable pitch system is relieved, and the service life of the variable pitch system is prolonged.

Description

technical field [0001] The invention belongs to the field of wind turbine control, in particular to a power-limiting control method of a variable-speed constant-frequency wind turbine that reduces pitch-changing actions. Background technique [0002] With the increasing penetration of wind power in the power grid, on the one hand, traditional wind turbines adopt MPPT control strategies to capture the maximum wind power output, but due to the unpredictability of wind speed, random fluctuations and time lag of pitch angle actuators, wind power The large-scale fluctuation of the output power of the unit will affect the power quality and threaten the safe and stable operation of the power grid; Increasing grid responsibility. [0003] When the current mainstream power limiting method is at medium and low wind speeds, the operating conditions of the fan are optimized by adjusting the speed first; but when the wind speed fluctuates in the high wind speed range, the wind rotor is ...

AI Technical Summary

Problems solved by technology

[0002] With the increasing penetration of wind power in the power grid, on the one hand, traditional wind turbines adopt MPPT control strategies to capture the maximum wind power output, but due to the unpredictability of wind speed, random fluctuations and time lag of pitch angle actuators, wind power The large-scale fluctuation of the output power of the unit will affect the power quality and threaten the safe and stable operation of the power grid; Growing Grid Responsibilities

[0003] When the current mainstream power limiting method is at medium and low wind speeds, the operating conditions of the fan are optimized by adjusting the speed first; but when the wind speed fluctuates in the high wind speed range, the wind rotor is maintained at the rated speed by adjusting the pitch angle. The paddle mechanism will move frequently, which will easily lead to fatigue and shorten the service life

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