一种用于异步电机矢量控制的新型滑模转子磁链观测器研究

针对异步电机矢量控制需要实现定、转子电路解耦的一个关键问题是准确地观测转子磁链.提出了一种以异步电机在两相同步旋转坐标系下的定子电流和转子磁链为状态变量的基于滑模变结构思想的转子磁链观测器,对滑模变结构输入控制信号的设计使得滑模运动速度与轨迹和滑模面的距离相关联,并利用李亚普诺夫理论证明了算法的收敛性.通过仿真表明,该方法具有较高的转子磁链观测准确度,对转子电阻的变化具有很强的鲁棒性,能够改善异步电机矢量控制调速系统的动静态性能.

Study of a new sliding mode rotor flux observer for induction motor vector control

Induction motor vector control system needs the decoupled of stator and rotor circuits, the key issue is how to observe the rotor flux accurately. Taken the stator current and rotor flux of induction motor in two-phase synchronous rotating coordinate system as state variables, a new rotor flux observer based on sliding mode variable structure theory was put forward. The design of sliding mode control input signal made sliding velocity and the distance between trajectory and sliding-mode surface associated, and the algorithm convergence was proved by the Lyapunov theory. Simulation results showed the high accuracy of rotor flux observer and strong robustness to the rotor resistance change of the proposed method, and can improve dynamic and static performance of the induction motor vector control and speed regulation system.