电子科技 ›› 2019, Vol. 32 ›› Issue (3): 6-9.doi: 10.16180/j.cnki.issn1007-7820.2019.03.002

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高阶加时滞模型的系统频域辨识

单永明1,王亚刚1,王凯1,2   

  1. 1. 上海理工大学 光电信息与计算机工程学院,上海 200093
    2. 上海理工大学 上海出版印刷高等专科学校,上海 200093
  • 收稿日期:2018-03-18 出版日期:2019-03-15 发布日期:2019-03-01
  • 作者简介:单永明(1994-),男,硕士研究生。研究方向:系统辨识,先进过程控制等。|王亚刚(1967-),男,教授。研究方向:先进过程控制;复杂多变量系统辨识。|王凯(1973-),男,高级工程师。研究方向:工业物联网、工业过程控制系统应用。
  • 基金资助:
    国家自然科学基金(61074087)

Modeling Identification for High Order Process with Time-delay in the Frequency Domain

SHAN Yongming1,WANG Yagang1,WANG Kai1,2   

  1. 1. School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China
    2. Shanghai Publishing and Printing College,University of Shanghai for Science and Technology,Shanghai 200093,China
  • Received:2018-03-18 Online:2019-03-15 Published:2019-03-01
  • Supported by:
    National Natural Science Foundation of China(61074087)

摘要:

针对工业控制系统中带有时滞环节的高阶过程对象,由于设计控制器比较困难,文中采用二阶加纯滞后模型的频域辨识方法,通过采样对象的输入和输出数据,分析其频率响应并确定重要频率段。选取若干个重要频率响应点,利用幅频特性估算出系统模型参数,达到模型降阶目的。MATLAB仿真结果表明,文中方法适用于广泛的高阶时滞对象,并具有较好的准确性和鲁棒性。

关键词: 二阶加纯滞后模型, 频域辨识, 频率响应, 幅频特性, 模型降阶, MATLAB仿真

Abstract:

For the high order process with time-delay in industrial control systems, the second-order plus pure lag model was used to identify the frequency domain because it was difficult to design the controller. By sampling the input and output data of the object, the frequency response was analyzed and the important frequency segments were determined. Several important frequency response points were selected, and the system model parameters were estimated by the amplitude-frequency characteristics to achieve model reduction. The simulation results of MATLAB showed that the proposed method was suitable for a wide range of high-order time-delay objects and had good accuracy and robustness.

Key words: second-order plus pure lag model, frequency domain identification, frequency response, amplitude-frequency characteristic, model reduction, MATLAB simulation

中图分类号: 

  • TP273