基于无模型滑模方法的异步电动机转速控制

Speed Control of Asynchronous Motor Based on Model-free Sliding Mode Method

针对异步电动机的PI控制在复杂工况下控制性能下降的问题,提出了一种无模型滑模控制方法。首先,利用异步电机在参数摄动下的数学模型建立超局部模型;然后,引入新型趋近律,设计了转速环无模型滑模控制器;之后,通过扩展状态观测器观测超局部模型的未知扰动,提高了系统的抗扰性能;最后,将所提方法与PI控制和基于传统趋近律的无模型滑模控制进行仿真和实验对比。仿真和实验结果表明,所提方法提高了系统的鲁棒性,在保证系统具有良好动态响应性能的同时降低了系统对模型的依赖程度。

To solve the problem that PI control performance of asynchronous motor decreases under complex working conditions,a model-free sliding mode control method is proposed.Firstly,the ultra-local model is established according to the mathematical model of asynchronous motor under parameter uncertainties.Secondly,the model-free sliding mode speed controller is designed by introducing a new approach law.Thirdly,the extended state observer is used to estimate the unknown disturbance of the ultra-local model,and the anti-disturbance performance of the system is improved.Finally,the proposed method is compared with PI control and model-free sliding mode control based on conventional approach law.Simulation and experimental results show that the proposed method improves the robustness of the system and reduces the dependence of the system on the model while ensuring the system has good dynamic response performance.