Effect of recycle on the plant zero dynamics

作     者：Jacobsen, EW 

作者机构：Automatic Control Signals Sensors and Systems Royal Institute of Technology - KTH S-100 44 Stockholm Sweden 

出 版 物：《COMPUTERS & CHEMICAL ENGINEERING》 (计算机与化工)

年 卷 期：1997年第21卷第Sup期

页      面：S279-S284页

核心收录：

学科分类：0817[工学-化学工程与技术] 08[工学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

摘      要：It is well known that material and energy recycle may have a profound influence on the plant dynamics. Previous studies have shown that the introduction of recycle typically increases the dominant time-constant and disturbance sensitivity of the plant. In this work we consider the effect of recycle on the zero dynamics and show that recycle may introduce severe overshoots and inverse responses. Sufficient conditions for the existence of nonminimum phase transmission zeros caused by the presence of recycle are derived. The conditions may be evaluated based on steady-state information about the individual units only. The results are illustrated through application to a reactor-separator system.