基于阶跃响应的带纯滞后闭环辨识新方法.pdf

第22 卷第9 期 系 统 仿 真 学 报© Vol. 22 No. 9 2010 年9 月 Journal of System Simulation Sep., 2010 基于阶跃响应的带纯滞后闭环辨识新方法 靳其兵，刘子宜 （北京化工大学自动化研究所，北京 100029 ） 摘 要：先进控制成功应用的关键是精确模型的建立，传统的辨识方法受测试条件和稳定生产要求 的制约，难以在工业现场得到满意的应用。根据大量工业现场的需求提出了一种新型的针对带有纯 滞后环节的连续系统，基于阶跃响应测试的闭环辨识方法。该方法采用带控制器的迭代辅助变量 最小二乘法，解决了纯滞后时间估计和闭环系统可辨识性的问题。采用Monte Carlo 实验验证了该 算法的无偏性和有效性，通过仿真研究和实际应用表明该方法具有较高的精度和较强的鲁棒性，并 能够适用于非自衡对象。 关键词：闭环辨识；阶跃响应；纯滞后；非自衡对象 中图分类号：N945.14 文献标识码：A 文章编号：1004-731X (2010) 09-2168-05 Novel Identification Method with Time Delay from Step Response JIN Qi-bing, LIU Zi-yi (Automation Institute Beijing University of Chemical Technology, Beijing 100029, China) Abstract: The key factor for the successful application of advanced process control (APC) is the accuracy of the model. But the conventional identification methods was restricted by the requirement of simple testing and steady production, so they were used to provide unsatisfactory results in actual industrial plant. To solve that problem, a novel closed-loop identification algorithm was proposed to continue system with time delay based on the test of step response. Iterative Instrumental Variable Least Squares method with controller was used in the algorithm to solve the difficulty of identification of delay time and identifiability of close loop systems. Unbiasedness and validity were validated by Monte Carlo testing . It is illustrated that the algorithm is very accurate and robust by simulation and application. And integrating process is also applicable. Key words: closed-loop iden