Dynamic simulation of regulation characteristics and parameter tuning of PID controller for key equipment of LNG terminal

RONG Guangxin; SUN Heng; GENG Jinliang; GAO Xiaoyu; XU Jiaming

doi:10.12434/j.issn.2097-2547.20220346

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Dynamic simulation of regulation characteristics and parameter tuning of PID controller for key equipment of LNG terminal

- Dynamic simulation of regulation characteristics and parameter tuning of PID controller for key equipment of LNG terminal
- 作者机构：
  
  1. 中国石油大学(北京)油气管道输送安全国家工程实验室,城市油气输配技术北京市重点实验室,北京,102249
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- DOI：10.12434/j.issn.2097-2547.20220346
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RONG Guangxin, SUN Heng, GENG Jinliang, et al. Dynamic simulation of regulation characteristics and parameter tuning of PID controller for key equipment of LNG terminal. [J]. Low-Carbon Chemistry and Chemical Engineering
DOI：

RONG Guangxin, SUN Heng, GENG Jinliang, et al. Dynamic simulation of regulation characteristics and parameter tuning of PID controller for key equipment of LNG terminal. [J]. Low-Carbon Chemistry and Chemical Engineering DOI： 10.12434/j.issn.2097-2547.20220346.

摘要

针对液化天然气（LNG）接收站在工况变化时设备参数波动的问题，利用HYSYS软件，建立了LNG接收站工艺流程的动态模型。采用经验凑试法，分析了比例、积分、微分（PID）控制器的比例系数、积分系数和微分系数对储罐压力、再冷凝器液位和低压泵流量的影响规律，以减少LNG接收站运行中的波动性和不稳定性。结果表明，在储罐压力控制系统中，采用比例和积分控制，比例系数由1变为4时，恢复到设定值的时间可节省55.6%，并且在添加积分控制后可明显缩短恢复时间；再冷凝器液位控制系统中，在允许有静差的情况下，可采用纯比例控制，当比例系数由0.5变为5.0时，恢复到设定值的时间可节省62.9%，积分系数对液位控制的影响不明显；低压泵流量控制系统中，采用比例和积分控制，积分系数的变化对流量控制系统的影响较为明显，当积分系数由3.0减小为0.5时，恢复到设定值的时间可节省72.9%。最后给出了3个控制系统的推荐控制参数，可为LNG接收站中PID控制器参数的选取提供参考。

Abstract

Aiming at the problem of equipment parameter fluctuations in liquefied natural gas（LNG） terminal when operating conditions change, the dynamic model of LNG terminal process flow was established by using HYSYS software. The empirical trialand-error method was used to analyze the influence law of proportional, integral and differential coefficients of PID controller on tank pressure, re-condenser level and low-pressure pump flow to reduce the fluctuation and un-stability in the operation of LNG terminal.The results show that in the tank pressure control system with proportional and integral control, when the proportional coefficient is changed from 1 to 4, the recovery time to the set value can be saved by 55.6% and the recovery time can be significantly shortened by adding integral control. In the re-condenser level control system, single proportional control can be used under the condition that static difference is allowed when the proportional coefficient is changed from 0.5 to 5.0, the recovery time to the set value can be saved by 62.9%, and the integral coefficient has no obvious effect on the level control. In the low pressure pump flow control system with proportional and integral control, the change of the integral coefficient has a more obvious effect on the flow control system when the integral coefficient is reduced from 3.0 to 0.5, the recovery time to the set value can be saved by 72.9%. Finally, the recommended parameters of the three control systems were given, which can provide reference for the selection of PID controller parameters in LNG terminal.

关键词

LNG接收站动态模拟PID控制参数整定

Keywords

LNG terminaldynamic simulationPID controlparameter tuning

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Related Institution

Sinopec Tianjin Liquefied Natural Gas Co., Ltd.

SINOPEC Qingdao LNG Co., Ltd.

College of Pipeline and Civil Engineering, China University of Petroleum (East China)

School of Chemistry and Environmental Engineering, China University of Mining and Technology (Beijing)

Key Laboratory of Green Process Engineering, Institute of Process Engineering, Chinese Academy of Science

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