Control method and device for inhibiting overspeed of rotor of wind generating set

Abstract

The invention relates to the technical field of wind power generation, and discloses a control method and device for inhibiting overspeed of a rotor of a wind generating set, and the method comprises the steps: monitoring the rotating speed of the rotor of the wind generating set in real time, and giving an overspeed alarm and entering an overspeed control mode when the rotating speed of the rotor is greater than a fault rotating speed value; according to the overspeed control mode, the variable-pitch speed of the unit is controlled to be the variable-pitch speed during fault shutdown, the variable-pitch given angle is controlled to be the safe shutdown angle of the unit, and the torque is controlled to be in the constant-power control mode. When the rotating speed of a rotor is larger than a fault rotating speed value, unit shutdown operation is not carried out, overspeed alarm is carried out, an overspeed control mode is entered, in the overspeed control mode, rapid propeller retracting action is carried out by controlling the variable propeller speed, the variable propeller given angle and the torque of the unit, it is guaranteed that the load of the unit is within a safe range, and therefore the fault time is effectively shortened, and the working efficiency is improved. The economic benefits are guaranteed; moreover, the method does not relate to hardware transformation, only relates to software optimization, and is low in transformation cost.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a control method and device for suppressing overspeeding of a rotor of a wind power generating set. Background technique [0002] At present, the power control of some wind turbines adopts variable speed and constant frequency, and controls the rotor speed of the unit by adjusting the pitch angle. When the wind speed suddenly increases under certain working conditions, the wind turbine will adjust the pitch angle to keep the speed constant. However, if the wind speed changes too fast, the pitch response will not be timely, and the adjusted pitch angle cannot meet the actual control requirements. , causing the rotor speed of the unit to increase, exceeding the fault setting value, and a rotor overspeed fault is reported. Frequent rotor overspeed shutdown of the unit will affect the stability of the unit and affect the power generation. The pitch control can be simpl...

AI Technical Summary

Problems solved by technology

However, due to the actual installation terrain and ground conditions of the wind turbine, the design reserved load, the extreme wind speed and the electrical design of the pitch, not all rotor overspeed faults under all working conditions can be solved by adjusting the PID parameters.

Images