基于改进自适应趋近率的永磁同步电机无模型控制系统设计

Model-free Control for Permanent Magnet Synchronous Motor Based on Improved Adaptive Reaching Law

摘要:

传统的速度环控制在永磁同步电机负载突变时，会引起转速波动较大从而影响电机运行的稳定性，为了抑制转速波动，并实现电机转速的快速响应，采用了一种基于扩展滑模扰动观测器（Extended Sliding-mode Disturbance Observer，ESMDO）的改进型趋近率控制方法；新算法通过引入含有外部扰动的电机运动方程，并将扰动进行扩展分析，建立了扰动观测器的数学模型，增加扰动观测的准确性；为了减少滑模控制器的抖振，提高响应速度，提出了一种改进型的滑模趋近率，新控制器采用增益自适应、幂次自适应的方法，实现动态调节控制增益的目的；将新算法分别与基于传统指数趋近律的无模型算法和PI控制策略进行仿真对比，仿真结果验证了所提控制策略在提高系统响应速度以及抗干扰能力方面的优异性能。

Abstract:

When the traditional speed control encounters the abrupt load, it will cause a large speed fluctuations which may affect the stability of the motor operation. In order to reduce the speed fluctuations and improve the response speed of the motor speed, an improved adaptive reaching law model-free control method based on the Extended Sliding-mode Disturbance Observer (ESMDO) was proposed. The disturbance is extended for analysis by introducing the motor motion equation, and the mathematical model of the disturbance observer is established to increase the accuracy of disturbance observation. In order to reduce the chattering of the slide controller and improve the response speed, the new algorithm adopts an improved adaptive slide reaching law. By adopting the method of gain adaptation, controller can adjust the speed of approaching the sliding mode. By verifying the excellent performance of the new control strategy in improving the system response speed and anti-interference capability through the simulation comparison of the new algorithm with model-free control based on exponential reaching law and the PI control strategy.