PID Controller Design Based on Smith-type Compensator for Stable/Integrating Processes with Inverse Response and Time Delay.

• Main Authors: Sheng-Wen Lin, 林聖文
• Other Authors: Jyh-Cheng Jeng
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/jd987h

碩士 === 國立臺北科技大學 === 化學工程研究所 === 99 === In chemical industry, it is general to encounter great difficulties in process control when the system contains inverse response and time delay. To this circumstance, this thesis presents the design concepts and tuning rules for PID controller for stable/integrating processes with inverse response and time delay. The control system design is based on a Smith-type compensator for non-minimum phase (NMP) dynamics, which aims to remove these elements from the feedback loop. In this control scheme, it is necessary to factorize the process model into minimum phase and non-minimum phase portions. Different factorization methods are thus investigated and compared, and it turns out that the system resulted from direct factorization (DF) method can achieve better tradeoff between control performance and system robustness. Then, the equivalent feedback controller for the proposed configuration is approximated as a traditional PID controller by Maclaurin-series approach. The analytical tuning rules for PID parameters are developed where a single tuning controller parameter can be adjusted to make desired tradeoff between control performance and system robustness. Furthermore, the analysis of robust stability is provided. Several simulation examples have demonstrated the superiority of the proposed control design method.