基于一阶时滞系统的Smith预估器控制研究

Research of Smith Predictor Controller Based on First-Order Dynamics Plus Dead Time

针对PID控制算法不能适用于大时滞系统,本文以一阶时滞系统(FOPDT)为控制对象,提出了基于Smith预估器的控制方案,当系统模型不精确或有扰动时,通过添加滤波器增强系统的鲁棒性和抗干扰能力。仿真结果表明:该方法可有效消除时滞对系统动态性能的影响,加快时滞系统的调节过程,减小超调量,提高系统的稳定性和抗干扰能力。

Due to the unsuited for large time-delay system with PID control algorithm, this article takes first dynamics plus dead time as the control object, and puts forward a scheme based on Smith predictor. The robust and anti-jamming capability of the system can be enhanced by adding a filter when the system model is not accurate or has disturbance. Simulation result proves that： this method can effectively eliminate influence to the dynamic performance of system caused by time-delay, speed up the settling process, decrease overshoot, and increases stability and anti-jamming capability of the time-delay system.