摘要
在工业过程中,大滞后系统普遍存在。本文以高校教研实验用加热装置为研究对象,针对该温度控制系统具有大滞后的特点,采用串级控制结构结合Smith预估控制器的控制方案。内环采用Smith预估器,大幅度降低滞后对控制系统动态性能的影响;外环采用PI控制实现系统无静差。实验表明该种控制系统与单回路PID控制或Smith预估控制相比具有更优的动态特性和鲁棒性。
The large time-delay systems widely exist in industry proCess. According to the controlled object of the temperature with strong time-delay a scheme by use of cascade control and Smith controller is adopted, Smith controller is used in inside loop to reduce the influence on dynamic characteristic by large time-delay. PI controller is used in outside loop to eliminate static error. The practice demonstrates that the cascade control and Smith controller system is much better than single PID loop or predictor system in dynamic performance and robustness.
关键词
大滞后
串级控制
PID
Smith预估
Large time-delay Cascade control system PID Smith controller
