Nonlinear Model Algorithmic Control of a pH Neutralization Process

doi:10.1016/S1004-9541(13)60479-6

Abstract

Abstract: Control of pH neutralization processes is challenging in the chemical process industry because of their inherent strong nonlinearity. In this paper, the model algorithmic control (MAC) strategy is extended to nonlinear processes using Hammerstein model that consists of a static nonlinear polynomial function followed in series by a linear impulse response dynamic element. A new nonlinear Hammerstein MAC algorithm (named NLH-MAC) is presented in detail. The simulation control results of a pH neutralization process show that NLH-MAC gives better control performance than linear MAC and the commonly used industrial nonlinear propotional plus integral plus derivative (PID) controller. Further simulation experiment demonstrates that NLH-MAC not only gives good control response, but also possesses good stability and robustness even with large modeling errors.

Key words: model algorithmic control, nonlinear model predictive control, Hammerstein model, pH neutralization process, control simulation

摘要： Control of pH neutralization processes is challenging in the chemical process industry because of their inherent strong nonlinearity. In this paper, the model algorithmic control (MAC) strategy is extended to nonlinear processes using Hammerstein model that consists of a static nonlinear polynomial function followed in series by a linear impulse response dynamic element. A new nonlinear Hammerstein MAC algorithm (named NLH-MAC) is presented in detail. The simulation control results of a pH neutralization process show that NLH-MAC gives better control performance than linear MAC and the commonly used industrial nonlinear propotional plus integral plus derivative (PID) controller. Further simulation experiment demonstrates that NLH-MAC not only gives good control response, but also possesses good stability and robustness even with large modeling errors.

关键词: model algorithmic control, nonlinear model predictive control, Hammerstein model, pH neutralization process, control simulation

ZOU Zhiyun, YU Meng, WANG Zhizhen, LIU Xinghong, GUO Yuqing, ZHANG Fengbo, GUO Ning . Nonlinear Model Algorithmic Control of a pH Neutralization Process[J]. Chin.J.Chem.Eng., 2013, 21(4): 395-400.

邹志云, 于蒙, 王志甄, 刘兴红, 郭宇晴, 张风波, 郭宁. Nonlinear Model Algorithmic Control of a pH Neutralization Process[J]. Chinese Journal of Chemical Engineering, 2013, 21(4): 395-400.

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