基于分数阶滑模观测的感应电机无速度传感器矢量控制

Induction motor sensorless vector control based on fractional order integral sliding mode observer

针对感应电机无速度传感器矢量控制中速度和磁链的观测问题,设计了一种感应电机速度和磁链的分数阶滑模观测器,该观测器综合了分数阶积分和滑模控制的优点。观测器以定子电流观测误差构成滑模面,根据李雅普诺夫定理证明了观测器的收敛性和稳定性,并设计了分数阶滑模控制律。将该观测器应用到了感应电机矢量控制系统中,实现了无速度传感器矢量控制。仿真试验表明,分数阶滑模观测器能有效减小滑模观测中的抖振,对磁链和速度有较高的动态辨识能力。而且,无速度传感器矢量控制系统在全速范围内较好的动态和稳态性能。

A rotor flux and speed estimator based on fractional-order sliding-mode was proposed for speed sensorless vector controlled induction motor drives.Advantages of fractional integral and sliding mode control were synthesized by the observer.The error between the measured and estimated stator current was utilized to define the sliding surface,the convergence and stability of the observer were proved by the Lyapunov stability theory,and then the control law was designed.The sensorless vector control using fractional-order sliding-mode observer was achieved.The simulations results illustrate that the designed observer can efficiently eliminate the chattering phenomena which exist in traditional sliding-mode observer and has higher dynamic recognition for flux and speed.Moreover,the sensorless vector control system has good dynamic and stable performance in the full speed range.