永磁直线同步电机电流环新型线性自抗扰控制

New Current Loop LADRC Design for Permanent Magnet Linear Synchronous Motor

永磁直线同步电机的抗扰能力较弱,电流环的动态性能易受磁场畸变、逆变器死区等因素影响而下降。为增强电流环的控制品质,选择使用线性自抗扰控制(LADRC)作为q轴电流环的闭环控制策略。考虑追踪高频信号时,电流环逆变器、低通滤波器等小滞后环节动态响应的不可忽略性,采用时、频域分析结合的方法,将电流环与小滞后环节联立,在频域内推导出电流环的新型二阶控制模型,进而在时域内建立起三阶电流环LADRC系统。设计了超前校正环节以减轻阶数升高带来的控制滞后,并给出了详细的控制系统参数整定方法。通过仿真与传统LADRC进行了对比。结果表明:新型LADRC控制策略在电流动态跟随、扰动抑制上性能更优,所构建的控制系统具有良好的控制性能。

The anti-disturbance performance of permanent magnet linear synchronous motor(PMLSM) was weak, and the dynamic performance of the current loop was easily affected by the distortion of magnetic field and the dead zone of the inverter. To enhance the control quality of the current loop, linear active disturbance rejection control(LADRC) was chosen as a closed loop control strategy for q-axis current loop. Considering that the dynamic response of small lag links such as current loop inverter and low-pass filter could not be ignored while tracking high frequency signals, a new two-order control model of the current loop was derived in the frequency domain by using the method of time domain and frequency domain analysis to link the current loop with the small lag link model, and then a three-order current loop LADRC system was established in the time domain. An advanced correction link is designed to reduce the control lag caused by the increase of the order, and a detailed parameter tuning method of the control system was given. Compared with the traditional LADRC, simulation results showed that the new LADRC control strategy had better performance in current dynamic following and disturbance rejection, and the control system had good control performance.