基于改进型滑模观测器的永磁同步电机分数阶微积分滑模控制

Fractional Order Integral Sliding Mode Control for Permanent Magnet Synchronous Motor Based on Improved Sliding Mode Observer

为了提高永磁同步电机调速系统的控制性能,结合滑模控制与分数阶微积分理论,设计了分数阶积分滑模转速控制器和改进型滑模观测器。针对转速控制器,采用基于反双曲正弦函数的新型趋近律削弱系统抖振,同时分数阶控制为系统提供了更多的控制余度,可以增强系统鲁棒性并进一步减小系统抖振。针对观测器,设计了采用新型趋近律fal函数的滑模观测器来获取反电动势估计值,利用分数阶锁相环技术提取反电动势中的转速和位置信息,有效提高了转子速度和位置的估计精度。通过仿真验证了所提出方法的可行性与有效性。

In order to improve the control performance of the permanent magnet synchronous motor speed control system,combined with sliding mode control and fractional calculus theory,a fractional order integral sliding mode speed controller and an improved sliding mode observer were designed. For the speed controller,the design of a new reaching law based on inverse hyperbolic sine function,which weakened the system chattering effectively,the fractional order control provided the system with more degree of freedom and it could reduce the chattering more and enhance the robustness of the system. Aiming at the observer,a new sliding mode observer based on the new reaching law of fal function was designed to obtain the back EMF value,and then utilized the FOPLL to extract the rotational speed information in the back EMF. The high-precision rotor position and velocity estimation value could be obtained.The simulation experiments verified the feasibility and validity of the proposed method.