净水厂送水泵房控制系统设计及应用 - 图文

吉林化工学院毕业设计说明书

净水厂送水泵房控制系统设计及应用

The control system design and application of water pump station

学生学号： 08540234 学生姓名： 黄亚波 专业班级： 测控0802 指导教师： 曹玉波 职 称： 副教授 起止日期： 2012.2.27～2012.6.15

吉 林 化 工 学 院

Jilin Institute of Chemical Technology

吉林化工学院毕业设计说明书

摘 要

近年来,能源紧张不时影响到工业生产及人民生活。因此,节能降耗是保证工业和生活稳定发展的一项关键措施。然而，长期以来，我国用水行业的技术水平相对比较落后，自动化程度低。

本论文设计一套基于PLC的变频调速恒压供水系统，并利用组态软件开发良好的运行管理界面。本系统包含3台水泵电机。采用通用变频器实现对三相水泵电机的软启动和变频调速，运行切换采用“先开先停”的原则。压力传感器检测当前水压信号，经由PLC与设定值经PID比较运算，从而控制变频器的输出电压和频率，进而改变水泵电机的转速来改变供水量，最终保持管网压力稳定在设定值附近。通过工控机与PLC的连接，采用组态软件完成系统监控，实现了运行状态动态显示及数据、报警的查询。

在运行过程中,水泵的出水流量随用水量大小而作自我调整，并可以做到从多泵到单泵的平滑切换，改变以往阶梯式调节。

关键词：变频调速；恒压供水；PLC；Wincc

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净水厂送水泵房控制系统设计及应用

Abstract

In recent years，less and less regeneratable energy have affected the industrial production and people’s life from time to time．Therefore it is to guarantee industry and consume. However, since long-term, our country falls behind with the more technical more horizontal more relative comparison of water profession，automation level is low.

It also have designed a set of water supply system of frequency control of constant voltage c，and have developed good operation management interface using Supervision Control and Data Acquisition． This system is formed by 3 pump generators，3 main pump generators form the circulating run mode of frequency conversion．With general frequency converter realize for three—phase pump generator soft start with frequency control，operation switch adopts the principle of“start first stop first”.The detection signal of pressure sensor of hydraulic pressure，via PLC with set value by carry out PID comparison operation，So，control frequency and the voltage of frequency converter，and then the rotational speed that changes pump generator come to change water supply quantity, eventually, it is nearby to maintain pipe net pressure to stabilize when set value．Through work control machine the connection with PLC，with Wincc group form software consummately systematic monitoring，have realized operation state development to show and data，report to the police inquiry．

In the process of operation, the pump make self adjustment with the size of water, and can be done from one pump to another smoothly, so it can be changed the regulation.

Key Words：Variable frequency speed—regulating;Constant-pressure water

supply;Plc;Wincc

life to stabilize a crucial measure of development that energy saving falls to

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吉林化工学院毕业设计说明书

目 录

摘 要..................................................................................................................................I ABSTRACT .......................................................................................................................... II 第1章 绪论........................................................................................................................... 1 1.1课题研究背景及意义 ................................................................................................... 1 1.2变频调速恒压供水的发展............................................................................................ 1 1.3变频恒压供水系统的国内外研究现状......................................................................... 2 1.4本文主要研究内容 ....................................................................................................... 2 第2章 恒压供水基本原理.................................................................................................... 4 2.1 恒压供水工艺简介 ....................................................................................................... 4 2.2变频调速供水原理 ....................................................................................................... 4 2.3供水系统对电气调速的基本要求 ................................................................................ 7 2.4 恒压供水节能原理 ....................................................................................................... 8 第3章 恒压供水控制系统设计 ........................................................................................ 11 3.1恒压供水系统控制 ..................................................................................................... 11 3.2恒压供水系统方案设计与选择 .................................................................................. 11 3.3 恒压供水系统框图 ..................................................................................................... 11 3.4系统工作原理 ............................................................................................................. 12 3.4.1系统控制示意图 .................................................................................................. 12 3.4.2系统工作原理 ...................................................................................................... 13 3.4.3 PID调节恒压控制原理 ....................................................................................... 14 3.5 硬件选择 .................................................................................................................... 15 3.5.1 PLC及模块.......................................................................................................... 16 3.5.2 变频器................................................................................................................. 17 3.5.3 软启动器 ............................................................................................................. 17 3.6系统主电路设计 ......................................................................................................... 17 3.7 程序设计 .................................................................................................................... 18 3.7.1 PLC I/O分配 ....................................................................................................... 18 3.7.2 PLC程序设计...................................................................................................... 20

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