Pole-placement self-tuning control of nonlinear Hammerstein system and its application to pH process control

doi:10.1016/j.cjche.2015.01.009

Abstract

Abstract: By taking advantage of the separation characteristics of nonlinear gain and dynamic sector inside a Hammerstein model, a novel pole placement self tuning control scheme for nonlinear Hammerstein system was put forward based on the linear system pole placement self tuning control algorithm. And the nonlinear Hammerstein system pole placement self tuning control (NL-PP-STC) algorithm was presented in detail. The identification ability of its parameter estimation algorithm of NL-PP-STC was analyzed, which was always identifiable in closed loop. Two particular problems including the selection of poles and the on-line estimation of model parameters, which may be met in applications of NL-PP-STC to real process control, were discussed. The control simulation of a strong nonlinear pH neutralization process was carried out and good control performance was achieved.

Key words: Nonlinear system, Hammerstein model, Pole placement, Self tuning control, pH control

摘要： By taking advantage of the separation characteristics of nonlinear gain and dynamic sector inside a Hammerstein model, a novel pole placement self tuning control scheme for nonlinear Hammerstein system was put forward based on the linear system pole placement self tuning control algorithm. And the nonlinear Hammerstein system pole placement self tuning control (NL-PP-STC) algorithm was presented in detail. The identification ability of its parameter estimation algorithm of NL-PP-STC was analyzed, which was always identifiable in closed loop. Two particular problems including the selection of poles and the on-line estimation of model parameters, which may be met in applications of NL-PP-STC to real process control, were discussed. The control simulation of a strong nonlinear pH neutralization process was carried out and good control performance was achieved.

关键词: Nonlinear system, Hammerstein model, Pole placement, Self tuning control, pH control

Zhiyun Zou, Dandan Zhao, Xinghong Liu, Yuqing Guo, Chen Guan, Wenqiang Feng, Ning Guo. Pole-placement self-tuning control of nonlinear Hammerstein system and its application to pH process control[J]. Chin.J.Chem.Eng., 2015, 23(8): 1364-1368.

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