交流感应电动机精确解耦的自抗扰控制

摘要

In order to realize AC asynchronous motor’s high performance speed regulation, changing load torque’s fast tracking,the motor’s mathematical model of static two-phase coordinate system αβ is precisely linearized,and realized full decoupling of rotate speed system and rotor flux linkage system. Two active disturbances rejection controllers are designed flux linkage system,and for decoupled rotate speed system and rotor fully independently rotate speed and flux linkage are controlled. Experiment results show:rotate speed reached reference value about 0.7 s,and flux linkage reached reference value about 0.3 s;load toque’s changing would cause rotate speed’s changing about 7 rad·s-1,but flux linkage still held at reference value; the electric torque could fast track changing load torque in 1s when rotate speed is stabilized and electric torque’s overshoot doas not exceed 20 N·m;the designed control system an be adapted variation range of ±10%rotor resistance and +10%stator resistance.%为了实现交流感应电动机高性能调速，快速跟踪变化的负载转矩，对静止两相αβ坐标系中的电动机数学模型精确反馈线性化，实现转速和转子磁链系统的完全解耦。针对解耦的转速和磁链子系统的设计2个结构完全相同的自抗扰控制器，实现对转速和磁链的完全独立控制。实验研究表明：电动机转速和磁链分别大约在0.7 s和0.3 s时达到参考值；负载转矩的变化将引起转速7 rad·s-1范围内的变化，但磁链仍保持给定值；当转速稳定时，电磁转矩在1 s时间内能快速跟踪变化的负载转矩，其超调量不超过20 N·m；控制系统能适应转子电阻±10豫和定子电阻+10豫范围的变化。