本科毕业论文
基于pLc和变频器对恒压供水系统的设计
考生姓名： 陈子才 准考证号：
专业层次： 本 科 院 （系）：机械与动力工程学院 指导教师： 职 称： 讲 师
重庆科技学院
二O一二年开七月二十日
本科毕业论文
基于pLc和变频器对恒压供水系统的设计
考生姓名： 陈子才 准考证号：
专业层次： 本 科 指导教师： 院 （系）：机械与动力工程学院
重庆科技学院
二O一二年七月二十日
重庆科技学院高等教育自学考试本科毕业论文 中文摘要
摘 要
随着国家的经济建设和人们的生活水平的逐步提高，高层建筑的楼层不断增高，城区的面积不断扩大，城市供水管线不断延伸，城市供水是系统面临着越来越大的压力，由于水压不足，严重影响了上述用户的正常工作和生活。为了保障高层建筑和供水管线终端用户能正常用水，需要针对实际情况对上述用户的供水系统增加压力，恒压供水系统可有效地解决高层建筑和供水管线终端用户水压不足，而影响正常供水问题。恒压供水在日常生活中非常重要，基于PLC和变频器技术设计的生活恒压供水控制系统可靠性高、效率高、节能效果显著、动态响应速度快。因实现了恒压自动控制，不需要操作人员频繁操作，节省了人力，提高了供水质量，减轻了劳动强度，可实现无人值班，节约管理费用。对整个供水过程来说，系统的可扩展性好，管理人员可根据每个季节的用水情况，选择不同的压力设定范围，不但节约了用水，而且节约了电能，达到了更优的节能方式，实现供水的最优化控制和稳定性控制。
本论文根据中国城市小区的供水要求，设计了一套基于PLC的变频器对恒压供水系统, 并利用组态软件开发良好的运行管理界面。变频恒压供水系统由可编程控制器、变频器、水泵机组、压力传感器、工控机等构成。
关键词： 变频调速，恒压供水，PLC，组态软
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重庆科技学院高等教育自学考试本科毕业论文 英文摘要
Based on pLc and frequency converter for constant pressure
water supply system design
ABSTRACT
With the national economic construction and people's living standard gradually enhancement, high-rise building floors continuously increased, urban area expands ceaselessly, city water supply pipeline extends continuously, city water supply system is facing more and more pressure, due to insufficient pressure, seriously affected the normal work and life of user. In order to guarantee the high building and water supply pipeline terminal users to normal water, need according to the actual situation on the users of the water supply system to increase pressure, constant pressure water supply system can effectively solve the high-rise buildings and water supply pipeline terminal user of insufficient water pressure, and affect the normal water supply problems. Constant pressure water supply in daily life is very important, based on PLC and frequency converter technology to design the life constant pressure water supply control system has high reliability, high efficiency, obvious energy saving effect, fast dynamic response. Because of the realization of automatic control, operating personnel do not need frequent operation, saving manpower, improve water quality, reduce labor intensity, can realize unattended, save administrative costs. On the whole process of water supply, the system has good expansibility, managers can according to each season the water situation, choose a different pressure setting range, not only saves water, but also saves energy, achieve better energy saving way, realize water supply optimal control and stability control.
This thesis according to the Chinese city residential water demand, designed a set based on the PLC inverter for constant pressure water supply system, and the use of configuration software to develop good management interface. Frequency constant pressure water supply system by programmable controller, frequency converter, water pump, a pressure sensor, the IPC.
Keywords：Variable frequency speed control, Constant pressure water supply, PLC, configuration software
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重庆科技学院高等教育自学考试本科毕业论文 目录
目 录
摘 要 ......................................................................................................... I ABSTRACT ............................................................................................. II 1 绪 论 ....................................................................................................... 1
1.1 课题的提出 ......................................................... 1
1.3 PLC概述 ............................................................ 2
1.3.1 可编程控制器的定义 ............................................. 2 1.3.2 PLC的发展和应用 ............................................... 2 1.4 本课题的主要研究内容 ................................................ 3
2 系统的理论分析及控制方案确定 ........................................................ 4
2.1 变频恒压供水系统的理论分析 .......................................... 4
2.1.1 电动机的调速原理 ............................................... 4 2.1.2 变频恒压供水系统的节能原理 ..................................... 4 2.2 变频恒压供水系统的组成及原理图 ...................................... 6
3 系统的硬件设计 .................................................................................... 9
3.1 系统主要设备的选型 ................................................. 9 3.2 系统主电路分析及其设计 .............................................. 9 3.3 系统控制电路分析及其设计 ........................................... 11 3.4 PLC的I/O端口分配及外围接线图 ..................................... 13
4 系统的软件设计 .................................................................................. 16
4.1 系统软件设计分析 .................................................. 16 4.2 PLC程序设计 ....................................................... 16
4.2.1控制系统主程序设计 ............................................ 17 4.2.2 控制系统子程序设计 ............................................ 20 4.3 PID控制器参数整定 ................................................. 23
4.3.1 PID控制及其控制算法 .......................................... 23 4.3.2 PID参数整定 .................................................. 25
5 监控系统的设计 .................................................................................. 27
5.1 组态软件简介 ...................................................... 27
5.2 监控系统的设计 .................................................... 27
5.2.1 组态王的通信参数设置 .......................................... 27 5.2.2 新建工程与组态变量 ............................................ 28 5.2.3 组态画面 ...................................................... 29 5.2.4 监控系统界面 .................................................. 30
结 论 ......................................................................................................... 32 致 谢 ......................................................................................................... 33 参考文献................................................................................................... 34
附 录 .............................................................................................................................................. 35
论文原创性声明
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