摘要：在工业生产中液位是重要的被控量，研究液位控制将带来很大意义。水箱的液位控制对于冶金、化工、石油等工业生产行业来说是重要的一个环节。本篇论文将以三容水箱作为对象设计一个多阶液位控制系统，采取串级控制对三容水箱进行液位控制。首先针对三容水箱的特性进行数学建模分析，并且通过实验建模法得到三容水箱的上、中、下各级水箱的传递函数。然后根据三容水箱模型的特性和通过分析水箱的传递函数来使用PID控制器设计实现串级控制系统，并且使用simulink对控制系统的过程进行仿真，得到的控制的效果良好，证明了使用串级控制控制三容水箱能到达预计效果。最后，通过组态王实现监控，完成报警画面，完成同时显示所有设备和参数的故障报警信息的功能。实时趋势图和历史趋势画面的设计将展示测量仪表的实时读数和在某段时间的变化走向。80539

关键词：PID；多阶液位；串级控制；simulink仿真

The design of multi-level liquid level control system based on kingview

Abstract：In industrial, level acts as an important role of process control, research level control will bring great significance。 Water tank level control for metallurgy, chemical, oil and other industrial production industry is an important part。 In this paper, we will design a multi-stage liquid level control system with three tanks as the object, and take the cascade control to control the three-tank。 Firstly, the mathematical modeling and analysis of the characteristics of the three - tank are carried out, and the transfer function of the upper, middle and lower water tanks of the three - tank is obtained by the experimental modeling method。 Then, according to the characteristics of the three-tank model and the transfer function of the tank, the cascade control system is designed and realized by using the PID controller。 Simulink is used to simulate the process of the control system。 The control effect is well, Control three tank can reach the expected effect。 Finally, through the configuration king to complete the alarm screen, complete at the same time display all the equipment and parameters of the fault alarm information function。 The design of the real-time trend graph and the historical trend picture will show the real-time reading of the measuring instrument and the change trend of the time。 Finally, the communication between the configuration software and the hardware device is completed。

Keywords: PID; Three water tank; Cascade control; simulink

目  录

1 绪论 1

1。1 课题的目的和意义 1

1。2 国内外研究现状与水平 1

2 过程控制概述 3

2。1 过程控制的特点 3

2。2 工业过程控制的发展概况 3

2。3 过程计算机控制系统 4

3 三容水箱的数学模型的建立 5

3。1 实验法简介 8

3。2 实验步骤介绍 8

3。3 水箱液位数据采集方法 9

3。3。1 上水箱阶跃响应参数测定 9

3。3。2 中水箱阶跃响应参数测定 9

3。3。3 下水箱阶跃响应参数测定 10

3。4 数据拟合与水箱传递函数求取 10

3。4。1 三容水箱拟合曲线的绘制