基于灵敏度的大滞后过程对象自适应PI控制器  

Adaptive PI Controllers for Large Dead-time Processes with Sensitivity Specification

作　　者：王亚刚[1] 许晓鸣[1] 

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《控制工程》2009年第3期257-260,共4页Control Engineering of China

基　　金：上海市自然科学基金资助项目(08ZR1415500);上海市科委重点攻关计划基金资助项目(072305126)

摘　　要：针对较难控制的大滞后过程对象,提出一种基于灵敏度鲁棒性能指标的自适应PI控制器,使控制回路在运行过程中始终保持在最佳运行状态,最终提高工业过程设备的运行效率。利用控制回路在正常运行过程中产生的过程对象输入和输出信号,通过信号分解和傅立叶分析运算在线辨识过程对象在重要频率点上的频率响应特性,然后通过同一阶加纯滞后模型在幅值和相位两方面的匹配获得一个可以很好地描述大滞后对象的传递函数模型。基于模型计算出满足灵敏度性能指标的PI控制器参数,实现了大滞后过程对象的自适应PI控制。所提出的PI控制器的自适应过程不需要过程对象的任何先验知识,也不需要中断控制回路的正常运行。仿真实验表明模型的在线辨识精确,而且自适应PI控制可以保证系统的鲁棒性能和预期的控制性能。An adaptive PI controller with sensitivity specification for large dead-time processes is presented to keep the control loops being optimal all time and improve efficiency of process equipments as well. Based on the process input and output data of normal operation in the control loop, the important frequency responses of process are estimated with signal decomposition and Fourier analysis. Then a first-order plus dead-time transform function is identified by matching in both amplitude and phase values. The PI control parameters are calculated to satisfy sensitivity specification. The adaptive procedure of PI controller does not need any prior knowledge of the process while the control loop is still in the normal operation. Simulation example shows that the online identified model is accurate and the adaptive PI controller can guarantee both desired robustness and control performance.

关 键 词：自适应控制 大滞后对象 灵敏度 PI控制器 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]