Modified switch control with buffer heating stage in chemical process startup

LUO Xionglin; ZUO Ruixiang; FENG Aixiang; XU Feng

doi:10.11949/j.issn.0438-1157.20140923

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Modified switch control with buffer heating stage in chemical process startup

更新时间：2025-12-10

- Modified switch control with buffer heating stage in chemical process startup
- CIESC Journal Issue 2, Pages: 647-654(2015)
- 作者机构：
  
  中国石油大学自动化系,北京,102249
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20140923
  CLC： P273TQ021.8
- Online First：05 February 2015，
  
  Published：05 February 2015
- 稿件说明：
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LUO Xionglin, ZUO Ruixiang, FENG Aixiang, et al. Modified switch control with buffer heating stage in chemical process startup[J]. CIESC Journal, 2015, (2): 647-654.
DOI：

LUO Xionglin, ZUO Ruixiang, FENG Aixiang, et al. Modified switch control with buffer heating stage in chemical process startup[J]. CIESC Journal, 2015, (2): 647-654. DOI： 10.11949/j.issn.0438-1157.20140923.

摘要

化工过程的开工大多表现为一个升温过程。为满足升温过程的快速性而又不失稳定性的要求

有学者提出将时间最优Bang-Bang控制与其他控制方法结合来控制升温过程

但由于Bang-Bang控制对切换次数和切换点要求严格

致使其在实际应用中不够理想。在Bang-Bang组合控制的基础上引入缓冲升温控制

将整个控制系统分为4部分:全幅升温、全幅降温、缓冲升温、PID控制。将温度变化率作为缓冲升温与PID控制的切换变量

将修正切换控制问题等价为非线性规划问题

优化选取全幅升温、全幅降温、缓冲升温最优切换时间点。实例对比分析表明

该切换开工控制方案不仅避免了因切换次数与切换点选取不当导致的不良问题

且超调小

稳定快。

Abstract

Chemical process startup is mostly a heating process

to satisfy the requirements of speed and stability

some researchers proposed Bang-Bang control combined with other control method for controlling the heating process

but due to strict requirements of Bang-Bang control on switching time and switching point

its practical application is not satisfactory. So based on Bang-Bang control

a buffer heating stage was added. Then the temperature control process could be divided into four parts: full width

zero brake

buffer heating and PID control. The rate of change of temperature was used as switching variable between buffer heating and PID control. In addition

modified switch control was converted to nonlinear programming problems

and switching points of the first three parts were optimized. Simulation comparison revealed that the control method not only avoided the problem caused by inproper selection of switching times and switching points

but overshoot was small and the process could be stabilized quickly.

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