基于数字PID的双容水箱液位串级控制系统设计

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英文篇名：Design of Cascade Control System for Double-tank Liquid Level Based on Digital PID 作者：卢春华 ; 王頔 ; 谷瑞邦 英文作者：LU Chun-hua;WANG Di;GU Rui-bang;Anyang Institute of Technology,Electronic Information and Electrical Engineering College; 关键词：液位 ; 串级控制 ; PLC ; 组态王 英文关键词：Liquid level;;Cascade control;;PLC;;Kingview 中文刊名：YYLY 英文刊名：Applied Energy Technology 机构：安阳工学院电子信息与电气工程学院; 出版日期：2019-01-25 出版单位：应用能源技术 年：2019 期：No.253 基金：2017年河南省科技厅科技攻关项目(17210221-0158) 语种：中文; 页：YYLY201901015 页数：2 CN：01 ISSN：23-1184/TK 分类号：55-56

摘要

液位测量与控制由于受到被测介质的物理化学性质以及工作条件的影响,目前仍然是一个比较薄弱的环节。文中设计是以双容水箱模拟工业现场高阶对象,以中水箱液位为主参数的液位串级控制系统。采用西门子S7-200作为控制器,控制规律采用经典的PID,电容式差压变送器检测水箱液位,对数电动调节阀为执行机构。通过组态王软件建立组态界面,完成系统的实时监控。实验结果表明,系统能够实现液位的无静差调节,且抗干扰能力较强,具有良好的动态和稳态性能。
        Level measurement and control is still a weak link due to the physical and chemical properties of the medium under test and the influence of working conditions. This design is a liquid level cascade control system,which simulates the high-order object of industrial field with double-tank and takes the liquid level of intermediate water tank as the main parameter. Siemens S7-200 is used as controller,classical PID is used as control law,capacitive differential pressure transmitter is used to detect tank level,and logarithmic electric regulating valve is used as actuator. Configuration interface is established by Kingview software to complete real-time monitoring of the system. The experimental results show that the system can realize the non-static adjustment of liquid level,and has strong anti-interference ability,good dynamic and steady-state performance.

引文

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    [3]卢春华,石峰,范六灿.双容水箱液位控制系统设计[J].山东:山东工业技术,2018(13).