基于LADRC的永磁同步电机预测电流控制系统

Predictive current control system of PMSM based on LADRC

针对永磁同步电机(PMSM)模型预测电流控制(MPCC)系统中速度环采用PI控制时,系统调速效果容易受电机参数影响而无法兼顾鲁棒性和动态性能的问题,提出了一种线性自抗扰控制(LADRC)与双矢量模型预测电流控制(TV-MPCC)相结合的PMSM最优控制策略.首先给出了PMSM的数学模型,并在同步旋转坐标系下搭建PMSM TV-MPCC模型;然后设计了一种由线性扩张状态观测器(LESO)和线性状态误差反馈(LSEF)构成的一阶LADRC控制器,在线性简化传统ADRC结构的同时降低参数整定的复杂度;最后利用设计的LADRC控制器替代电机调速系统中传统的PI速度调节器.仿真结果表明,采用LADRC的调速系统能够较有效地适应电机参数变化,相比PI控制及同类方法具有更好的鲁棒性和动态性能,电机转速响应速度快,超调量小,抗扰能力强且无稳态误差,电流总谐波失真减小.

For a permanent magnet synchronous motor(PMSM)model predictive current control(MPCC)system,when the speed loop adopts proportional-integral(PI)control,speed regulation is easily affected by motor parameters,resulting in the inability to balance the system robustness and dynamic performance.A PMSM optimal control strategy combining linear active disturbance rejection control(LADRC)and two-vector MPCC(TV-MPCC)is proposed.Firstly,a mathematical model of a PMSM is presented,and the PMSM TV-MPCC model is developed in the synchronous rotation coordinate system.Secondly,a first-order LADRC controller composed of a linear extended state observer and linear state error feedback is designed to reduce the complexity of parameter tuning while linearly simplifying the traditional active disturbance rejection control(ADRC)structure.Finally,the conventional PI speed regulator in the motor speed control system is replaced by the designed LADRC controller.The simulation results show that the speed control system using LADRC can effectively deal with the changes in motor parameters and has better robustness and dynamic performance than PI control and similar methods.The system has a fast motor speed response,small overshoot,strong anti-interference,and no steady-state error,and the total harmonic distortion is reduced.