高速磁悬浮永磁电机三电平无速度传感器控制

Three-Level Sensorless Control of High Speed Maglev Permanent Magnet Motor

针对中点钳位(NPC)三电平变换器在高频状态下的中点电压不平衡问题,采用基于GH坐标系的三电平调制方式和基于比例调节因子的中点电压平衡控制方法。针对高速磁悬浮永磁电机高频状态下的转速辨识与高速稳定运行问题,采用适用于高速旋转磁场的磁悬浮永磁电机无速度控制方法。对所提控制方法进行仿真验证,并进行现场应用。实测结果表明,所提控制策略能够实现无位置传感器情况下高速磁悬浮永磁电机的转子位置定位和低速起动控制,并实现高速稳定运行。所提高速磁悬浮永磁电机控制方法具有很好的实际应用价值。

Aiming at the neutral point voltage imbalance in NPC three-level converter at high frequency,a three-level modulation based on GH coordinate system and a neutral point voltage balance control based on proportional adjustment factor are adopted.Regarding the speed identification and high-speed stable operation of high-speed magnetic levitation permanent magnet motor in high-frequency state,the sensorless control strategy of magnetic levitation permanent magnet motor suitable for high-speed rotating magnetic field is adopted.The proposed control method is verified by simulation and applied in the field.The experimental results show that the proposed control method can realize the rotor position positioning and low-speed starting control of high-speed permanent magnet motor without position sensor,and achieve high-speed and stable operation.The proposed control method has good practical application value.