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A Study on Design of Process Control System in the Presence of Load Change

负荷变化时过程控制系统的设计研究

基本信息

批准号：
02650303
负责人：
KATAYAMA Tohru
金额：
$ 1.41万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650303/
关键词：
Process control Tracking control Preview control Time delay Load change Exact linearization LQ control

项目摘要

The aim of this research is to develop a design method of digital tracldng control system for chemical plants in the presence of large load changes. We direct much attention to the fact that the chemical processes of interest are subject to time-delays, nonlinearities, and direct link between the control input and output. The following are the findings of the present research.1. Based on the LQI technique, we derive an optimal digital controller having integral, state feedback plus preview action.2. For a special case of importance where the time-delay is unilateral, we develop an algorithm to compute feedback gain with less computational effort.3. We apply the above control algorithm to a control of a pilot heat exclianger plant, where the purpose is to regulate the water outlet temperature and flow rate independently to follow the given references without steady state errors.4. We present a design method of a nonlinear control system combining an exact input-output linearization technique and the tracking control algorithm of developed above.5. We apply tlie above technique to a tracking control of a nonlinear continuous stirred tank reactor(CSTR)with a time-delay and in tlie presence of large load changes. Simulation studies show the effectiveness of the present algorithm. Tlie robustness of tlie resulting control system is checked by simulations by giving perturbations of <plus-minus>20% to nominal paraineter6. During this research, we understand the importance of developing a technique for checking a robustness of a resulting nonlinear control system, since at present there exists no methodology to evaluate the robust stability of a nonlinear tracking control system.

本研究的目的是开发一种在大负荷变化情况下的化工装置数字跟踪控制系统的设计方法。我们直接关注的事实，即感兴趣的化学过程是受时间延迟，非线性，控制输入和输出之间的直接联系。以下是本研究的结果。基于LQI技术，我们推导出一个具有积分、状态反馈和预见作用的最优数字控制器.对于一个重要的特殊情况，即时滞是单向的，我们提出了一种计算反馈增益的算法，计算量较小.将上述控制算法应用于某中试换热器的控制中，目的是独立地调节换热器的出水温度和流量，使其无稳态误差地跟随给定的参考值.提出了一种结合精确输入输出线性化技术和上述跟踪控制算法的非线性控制系统的设计方法.本文将上述方法应用于具有时滞的非线性连续搅拌釜式反应器（CSTR）的跟踪控制中。仿真研究表明了该算法的有效性。通过对标称parainer6施加20%的扰动，仿真验证了所得到的控制系统的鲁棒性。<plus-minus>在这项研究中，我们理解的重要性，开发一种技术来检查所产生的非线性控制系统的鲁棒性，因为目前还没有方法来评估的非线性跟踪控制系统的鲁棒稳定性。