Anti-disturbance control for nonlinear systems subject to input saturation via disturbance observer

作者：Wei Yunliang; Zheng Wei Xing^*; Xu Shengyuan

来源：Systems & Control Letters, 2015, 85: 61-69.

DOI：10.1016/j.sysconle.2015.08.006

• Disturbance uncertainties
• Disturbance observer based control
• Disturbance attenuation
• Input saturation

This paper is concerned with the problem of the disturbance observer based control for a class of continuous-time uncertain systems subject to input saturation and nonlinearity. The input of the system includes two parts, the control input and the disturbance input. The nonlinearity of the system, which satisfies a global Lipschitz condition, is considered as two cases of known nonlinearity and unknown nonlinearity. By virtue of the technique of the disturbance observer based controller, the anti-disturbance controllers are designed respectively with both the polytopic and dead-zone representations of the saturation function, which ensure that the resulting closed-loop systems are asymptotically stable with an estimation of the domain of attraction described by the level set of the Lyapunov function. Further, an iterative optimization method is used to obtain the maximum estimation of the domain of the set of initial states. An example of application design for a flight control system illustrates the effectiveness of the proposed results.

• 出版日期2015-11
• 单位南京理工大学