Position failure fault-tolerant driving control method for wind power generation pitch system

Abstract

The invention discloses a position failure fault-tolerant driving control method for a wind power generation pitch system. During the operation of a permanent magnet synchronous motor, the electromagnetic parameters of the motor are detected; when the permanent magnet synchronous motor normally operates on the condition that a position sensor exists, the motor status information is calculated in real time; the position working status of the permanent magnet synchronous motor is judged, smooth switching between sensor control and sensor-less control of a driving control system is flexibly conducted according to the working status; under the sensor-less vector control double closed loop condition, the permanent magnet synchronous motor driving control method is set up; after the position sensor output signal breaks down during the normal operation of the permanent magnet synchronous motor, the permanent magnet synchronous motor is switched from a vector control system with actual position and rotation speed feedback into a sensor-less vector control mode using an estimated position and a speed signal. After the breakdown signal is removed, the system is switched from a sensor-less vector control mode into a position vector control mode in real time.

Description

technical field [0001] The invention relates to a position fault-tolerant drive control method for a wind power generation pitch system, and belongs to the technical field of position fault-tolerant drive control methods. Background technique [0002] The pitch system in wind power generation controls the speed of the wind rotor by controlling the angle of the blades, and then controls the output power of the fan, and can stop the fan safely through aerodynamic braking. When the fan is running normally, all parts rotate with the hub at a certain speed. When the wind speed exceeds the rated wind speed of the unit (wind speed is between 12m / s and 25m / s), in order to control the power output, the pitch angle is limited to 0 degrees to 30 degrees. degrees (the pitch angle is automatically adjusted according to changes in wind speed), and the speed of the wind rotor is kept constant by controlling the angle of the blades. Shutdown caused by any condition will cause the blades to...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems in the above-mentioned prior art, that is, to solve the problem that the blades of the fan cannot be feathered normally when the motor position sensor is damaged, thereby causing the overall damage of the fan, and at the same time, the backup sensor needs to occupy the space of the motor system. In the pitch system, due to the limited size, it is impossible to install redundant sensors in many occasions. In addition, in order to ensure the reliability of the system, the wiring of dual sensors is also an unavoidable problem.

Images