不稳定时滞对象的串级控制设计

Cascade Control Design for Unstable Process With Time Delay

中文关键词:  串级控制  不稳定系统  时滞  H_∞性能指标

英文关键词:cascade control  unstable system  time delay  H_∞performance specification

中文摘要:

      针对常见的开环不稳定串级过程，提出一种新的解析设计方法。副回路中采用两自由度内模控制结构，减少因副回路设定值响应与扰动抑制响应耦合对主回路性能的影响。主回路采用加滤波器的单位反馈控制结构，基于闭环最优灵敏度函数解析推导出设定值响应控制器，保证系统的整体性能。针对副回路存在的乘性不确定性，分析了系统的鲁棒稳定性，最后通过仿真验证了该控制方案的有效性。

英文摘要:

      A new analytical design method is proposed for unstable cascade processes.Two-degree-of-freedom internal mode control is adopted to reduce the influence on performance of primary loop because of the coupling between the set-point tracking and disturbance rejection in the secondary loop.The structure of unity feedback introduced low-pass filter is used in the major loop,and the major controller is derived based on the closed-loop sensitivity function,which guarantees a good system performance.The control system robust stability is analyzed in the presence of the process multiplicative uncertainty in the minor loop.Finally,simulation example demonstrates the validity of the proposed control scheme.