感应电动机系统的变结构反推控制研究

感应电动机系统的矢量控制为了进行电流(或电压)的3/2(或2/3)坐标变换需要进行转子转差或磁链角的计算，转子转差的计算容易受转子电阻变化的影响，而磁链角的直接计算容易受定子电阻变化的影响，因此避免转子转差或磁链角的计算对于感应电动机系统的控制是非常有意义的。文中把变结构反推控制运用于感应电动机系统的转矩和磁链控制，设计方法避开了转子转差或转子磁链角的计算，通过一定的坐标变换，基于定子侧的静止坐标系实现转矩和磁链的解耦控制。变结构反推控制设计能够实现快速的速度、转矩和磁链的渐近跟踪，同时系统控制器能够保证系统性能在电动机参数和外部负载变化时具有强的鲁棒性，通过Matlab仿真验证了系统设计的有效性和可行性。

Variable Structure Control With Backstepping of Induction Motor System

Rotor slip or rotor flux linkage angle computation is need for current (or voltage) 3/2 (or 2/3) transform in vector control of induction motor system. Computation of rotor slip is easily affected by rotor resistance variation. Direct computation of rotor flux linkage angle computation is easily affected by stator resistance. It is meaningful for induction motor control system to avoid rotor slip or rotor flux linkage angle computation. Variable structure control with backstepping is applied to torque and flux linkage control of induction motor system. Rotor slip or rotor flux linkage angle computation is avoided. Torque and flux linkage can be decoupled and controlled based on static coordinate of stator though coordinate transformation. Variable structure control with backstepping control design can not only provide better speed, torque and flux linkage tracking performance, but also assert system robust performance under motor parameters and load variation. At last Matlab simulation is given, which proves the efficiency and feasibility of system design.