变桨永磁伺服控制系统无位置传感器控制

Position Sensorless Control for Variable Pitch Permanent Magnet Servo Control System

变桨永磁伺服系统一般通过位置传感器获取精确的转子位置和速度信号,实现对变桨永磁伺服电动机的控制,驱动桨叶转动到指定位置。但考虑风电环境的复杂性,许多不确定因素影响机械式传感器可靠性和耐用性,因位置传感器故障导致的风电机组长时间停机会带来巨大的经济损失。研究了一种位置故障情况下风电变桨永磁伺服控制系统无位置传感器控制方法。采用滑模观测器实现系统中高速的稳定运行,为了弥补该方法零低速的缺陷,低速时采用了一种改进型脉动高频信号注入法,实现了变桨永磁伺服电动机全速范围的调速控制,提高了系统稳定性,并通过仿真模型验证了该方法的有效性和合理性。

Variable pitch permanent magnet servo system usually obtains precise rotor position and speed signal through position sensor,realizes the control of variable pitch permanent magnet servo motor,and drives the rotor to the specified position. But considering the complexity of the wind power environment,there are many uncertainties affecting the reliability and durability of mechanical sensors. Because of the location sensor failure,the long time downtime of wind turbines will bring huge economic losses. Based on this,a position sensorless control method for the permanent magnetic servo control system of wind power paddles under the condition of position fault was studied. Sliding mode observer was used to realize the stable operation of middle and high speed. In order to make up the defect at zero low speed,an improved pulse high frequency signal injection method was adopted at low speed. The speed control of variable pitch permanent magnet servo motor in full speed range was realized,and the stability of the system was improved. The validity and rationality of the method was verified by the simulation model.