Sensorless Control of PMSM Based on Improved Fractional-Order Sliding Mode
Aiming at the problem that permanent magnet synchronous motor is susceptible to disturbance during operation and that the use of symbol function by traditional sliding mode observer will bring high-frequency buffeting to the system and make the observation accuracy of rotor position low,in order to im-prove the anti-interference ability of the system and the observation accuracy of rotor position,a sensorless control method based on fractional order sliding mode linear active-disturbance rejection speed and current composite controller and improved super-twistingalgorithm sliding mode observer is proposed. Firstly,the improved third-order linear extended state Observer is used to observe the system disturbance and feed it back to the controller. Secondly,the linear error feedback control law in traditional linear active disturbance rejection control is replaced by a new fractional-order sliding mode approach law,and a fractional-order sliding mode linear active disturbance rejection speed and current compound controller is constructed. Final-ly,the symbol function of the traditional super-twisting algorithm is differentiated by fractional order,and the constant of the exponential of the nonlinear term is replaced by the transformation function. The simula-tion results show that this method has the characteristics of no overshoot,strong anti-interference ability,fast adjustment speed and high precision of rotor position observation.
万方数据
维普
