永磁交流调速系统参数辨识与PI自整定研究

Reasearch on Parameter Identification and PI Self-adjusting of AC Speed Control System for the Permanent Magnet Motor

传统PI控制器不具有参数在线整定功能,难以满足高性能永磁交流调速系统要求。根据永磁同步电机速度环等效原理和经典控制理论推导出PI参数与永磁电动机转动惯量的数学关系;根据永磁同步电机的运动方程和离散模型参考自适应理论,建立永磁电动机转动惯量辨识模型;通过软件方式实现PI参数在线自整定。基于TMS320F2407A的全数字交流调速实验结果证明离散模型参考自适应理论可实现转动惯量的在线辨识,PI自整定可有效地消除系统的超调,减少响应时间,极大地提高了系统的动态性能。

Traditional PI controllers have no self-adjusting function, which can＇t satisfy the needs of high performance AC speed con- trol system for the permanent magnet motor. The relationship between PI parameters and inertia is deduced on the basis of permanent magnet motor speed loop equivalent principle and classical control theories. Inertia identification model is established based on the mechanical equation and discrete model reference adaptive control theory of permanent magnet synchronous motor. Full-digital AC speed control results based on TMS320F2407A indicate that discrete model reference adaptive control can realize on-line inertia detection. PI self-adjusting can eliminate speed overshooting, decrease latency time, thus improving the dynamic performance of the system greatly.