【摘要】 针对异步电机难以建立精确的数学模型和矢量控制系统参数鲁棒性差的问题,提出了用线性自抗扰控制器控制异步电机调速系统。线性自抗扰控制器不需要电机的精确数学模型,通过线性扩张状态观测器估计出电机模型中的耦合项及参数摄动等引起的总扰动并加以补偿,能够实现磁链和转矩的完全解耦,从而提高系统性能。为了验证上述方案,对空载起动,突加负载,给定转速变化、转子电阻变化、转动惯量变化等情况进行了仿真,并与自抗扰控制器控制的异步电机调速系统进行了比较。仿真结果表明线性自抗扰控制器和自抗扰控制器一样,无超调、响应速度快、动态速降小、静态无误差,且对负载扰动、电机参数变化等具有很强的鲁棒性,但线性自抗扰控制器需要整定的参数大大减少了。更多还原

【Abstract】 It is difficult to develop an accurate mathematical model for the induction motor and the robustness of vector control system is poor.This paper firstly uses the linear active disturbance rejection controller(LADRC) in inductor motor drive system.The controller is not overly dependent on the accurate mathematical model of motor,so the system is inherently robust,and it can estimate and compensate the general disturbance that includes the unknown internal dynamics and the external disturbance,so the rotor flux decouples with torque completely.As a result,the performances are improved.To prove the above strategy,the proposed control system has been simulated under no load start,external torque disturbance,set point change,large inertia and rotor resistance variations in MATLAB/SIMULINK,at the same time,the comparison is made with active disturbance rejection controller(ADRC).Simulation results show that LADRC has the similar performance with ADRC that is they not only quicken the speed response of system without overshoot,reduce the dynamic speed drop and eliminate the error of the steady state,but also are robust to the load mutation and parameter variations of motor.Furthermore parameters regulation of LADRC is much more simple than ADRC.更多还原