基于MATLAB的变结构模型跟踪控制系统研究

Study on Variable Structure Model Following Control System Based on MATLAB

广泛应用的直流调速系统采用传统PID控制 ,往往在负载、模型参数大范围变化时 ,难以达到令人满意的控制效果 因而以直流调速系统为对象 ,设计了一种变结构模型跟踪控制器 ,基于MATLAB/SIMULINK建立了动态仿真模型 ,并着重分析了对象参数变化、负载变化、控制参数选择等对系统性能的影响 仿真及分析结果表明 :采用数字控制的变结构模型跟踪控制系统 ,对对象参数变化及负载变化不敏感 ,具有较高的鲁棒性 ;非自衡对象负载变化后 ,系统存在微小的静差 ;

The DC speed regulating system is widely used, which adopts traditional PID control. Thus it is difficult to obtain satisfactory control performance during large load and varying model parameters. In this paper, a variable structure model following controller is designed for DC speed control system. The simulating model based on MATLAB/SIMULINK is developed. The effects of the controlled object parameter variation, the load variation and the selection of control parameters on the system performance are analysed. From the simulation results it shows that variable structure model following control system using digital control is insensitive to the variations of the object parameters and the load, and has a high robustness. For non self equilibrating objects adopting variable structure model following control, there exist small static errors under a varying load. The behaviour of variable structure model following control system is highly affected by the selection of the control parameters.