时滞对象的自抗扰控制

时滞系统的控制在自动化领域具有重要意义。在剖析时滞系统控制的Smith预估法的本质的基础上,提出利用具有强大噪声抑制能力的"跟踪微分器"来实现"相位超前"、"相位滞后"等功能,从而解决时滞系统控制问题的新办法,其中包括把时滞算子近似成单位1的无视时滞法;把时滞算子近似成一阶惯性环节的提高阶次法;模仿Simith预估法把相位超前的虚拟输出当作被控量来进行无时滞对象控制的输出超前法;及引入虚似控制量的输入超前法等。相应的仿真研究表明,这些新方法都能控制好大时滞系统的控制问题,时滞大小已不再成为"难控"和"易控"的标准。

Auto-Disturbances Rejection Control for Time-Delay Systems

Control of delayed systems has considerable significance.The nature of Smith predictor design for the time delay systems is analyzed.Then based on the functions of the tracking differentiator,some novel methods of control design for the time-delay systems are proposed,including the ignoring delay method,where the delay is substituted by 1,the increasing order method,where the delay is replaced by a first order inertial element,the virtual output method,where the virtual output is introduced,and the virtual control method,where the virtual control determined by the auto-disturbances rejection control is introduced.The simulation research shows that the above methods are effective for the systems with large time-delay.