永磁同步电机滑模观测器鲁棒性控制研究

摘要

由于永磁同步电机在控制系统设计中受到参数误差、未建模动态等不确定的外部干扰,难以达到期望的控制效果,通常会采用滑模观测器对永磁同步电机进行控制.然而,尽管传统滑模观测器有着较强的鲁棒性,但实际上电机参数的变化依然会在一定程度上降低其估计精度.针对上述问题,提出了一种新型滑模观测器来进一步提高系统的鲁棒性和精确性,通过将参数识别技术和滑模观测器相结合,充分发挥两者的优点,既保证了鲁棒性又提高了系统的估算精度.仿真结果表明,与传统的控制方法相比,新型滑模观测器可以充分克服电机参数变化带来的不良影响,提高估计精度.%Because the permanent magnet synchronous motor is disturbed by parameter error and not dynamic in the design of control system,it is difficult to achieve the desired control effect,so the sliding mode observer is used to control the permanent magnet synchronous motor.However,although the traditional sliding mode observer has strong robustness,the change of motor parameters will reduce its estimation accuracy to a certain extent.According to this problem,a new sliding mode observor is proposod to furthor improvo the robustness and accuracy of the system,by combining the parameter identification technology and sliding mode observer,the advantages of both are fully realized,not only ensure robustness but accuracy of the system.The simulation results show that compared with the traditional control method,the improved sliding mode observer can overcome the adverse effect of the motor parameter variation and improve the estimation accuracy.