Soft Sensor for Inputs and Parameters Using Nonlinear Singular State Observer in Chemical Processes

doi:10.1016/S1004-9541(13)60570-4

Chinese Journal of Chemical Engineering ›› 2013, Vol. 21 ›› Issue (9): 1038-1047.DOI: 10.1016/S1004-9541(13)60570-4

• 过程系统工程与过程安全 • 上一篇下一篇

Soft Sensor for Inputs and Parameters Using Nonlinear Singular State Observer in Chemical Processes

许锋, 汪晔晔, 罗雄麟

Research Institute of Automation, China University of Petroleum, Beijing 102249, China

收稿日期:2012-08-28 修回日期:2013-01-10 出版日期:2013-09-28 发布日期:2013-10-01
通讯作者: LUO Xionglin
基金资助:
Supported by the National Natural Science Foundation of China (21006127), the National Basic Research Program of China (2012CB720500) and the Science Foundation of China University of Petroleum, Beijing (KYJJ2012-05-28)

Soft Sensor for Inputs and Parameters Using Nonlinear Singular State Observer in Chemical Processes

XU Feng, WANG Yeye, LUO Xionglin

Research Institute of Automation, China University of Petroleum, Beijing 102249, China

Received:2012-08-28 Revised:2013-01-10 Online:2013-09-28 Published:2013-10-01
Contact: LUO Xionglin
Supported by:
Supported by the National Natural Science Foundation of China (21006127), the National Basic Research Program of China (2012CB720500) and the Science Foundation of China University of Petroleum, Beijing (KYJJ2012-05-28)

摘要/Abstract

摘要： Chemical processes are usually nonlinear singular systems. In this study, a soft sensor using nonlinear singular state observer is established for unknown inputs and uncertain model parameters in chemical processes, which are augmented as state variables. Based on the observability of the singular system, this paper presents a simplified observability criterion under certain conditions for unknown inputs and uncertain model parameters. When the observability is satisfied, the unknown inputs and the uncertain model parameters are estimated online by the soft sensor using augmented nonlinear singular state observer. The riser reactor of fluid catalytic cracking unit is used as an example for analysis and simulation. With the catalyst circulation rate as the only unknown input without model error, one temperature sensor at the riser reactor outlet will ensure the correct estimation for the catalyst circulation rate. However, when uncertain model parameters also exist, additional temperature sensors must be used to ensure correct estimation for unknown inputs and uncertain model parameters of chemical processes.

关键词: soft sensor, state observer, nonlinear singular system, unknown inputs, uncertain model parameters, riser reactor of fluid catalytic cracking unit

Abstract: Chemical processes are usually nonlinear singular systems. In this study, a soft sensor using nonlinear singular state observer is established for unknown inputs and uncertain model parameters in chemical processes, which are augmented as state variables. Based on the observability of the singular system, this paper presents a simplified observability criterion under certain conditions for unknown inputs and uncertain model parameters. When the observability is satisfied, the unknown inputs and the uncertain model parameters are estimated online by the soft sensor using augmented nonlinear singular state observer. The riser reactor of fluid catalytic cracking unit is used as an example for analysis and simulation. With the catalyst circulation rate as the only unknown input without model error, one temperature sensor at the riser reactor outlet will ensure the correct estimation for the catalyst circulation rate. However, when uncertain model parameters also exist, additional temperature sensors must be used to ensure correct estimation for unknown inputs and uncertain model parameters of chemical processes.

Key words: soft sensor, state observer, nonlinear singular system, unknown inputs, uncertain model parameters, riser reactor of fluid catalytic cracking unit

许锋, 汪晔晔, 罗雄麟. Soft Sensor for Inputs and Parameters Using Nonlinear Singular State Observer in Chemical Processes[J]. Chinese Journal of Chemical Engineering, 2013, 21(9): 1038-1047.

XU Feng, WANG Yeye, LUO Xionglin. Soft Sensor for Inputs and Parameters Using Nonlinear Singular State Observer in Chemical Processes[J]. Chin.J.Chem.Eng., 2013, 21(9): 1038-1047.

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Soft Sensor for Inputs and Parameters Using Nonlinear Singular State Observer in Chemical Processes

Soft Sensor for Inputs and Parameters Using Nonlinear Singular State Observer in Chemical Processes

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