基于plc变频调速恒压供水系统的设计.doc
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基于plc变频调速恒压供水系统的设计,摘 要随着社会经济的高速发展,人们对生活供水的质量和供水系统的可靠性的要求越来越高;再加上目前能源的紧缺,利用先进的自动化技术、控制技术以及通讯技术,设计出高性能、高节能、能适应不同领域的恒压供水系统以成为必然。本论文针对自来水厂的供水要求,设计了一套由plc、变频器、压力变送器、多台水泵机组、计算机等主要设备构成的基...
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摘 要
随着社会经济的高速发展,人们对生活供水的质量和供水系统的可靠性的要求越来越高;再加上目前能源的紧缺,利用先进的自动化技术、控制技术以及通讯技术,设计出高性能、高节能、能适应不同领域的恒压供水系统以成为必然。本论文针对自来水厂的供水要求,设计了一套由PLC、变频器、压力变送器、多台水泵机组、计算机等主要设备构成的基于PLC变频调速的恒压供水系统。系统有效地解决了传统供水方式的不足,并且增加了许多辅助功能,尤其提高了系统的可靠性。
本文分析了变频调速恒压供水系统的原理,特点,及相对于传统恒压供水方式的优势。系统利用压力变送器将出水管网测得的水压反馈给PLC,PLC经过运算将模拟信号送给变频器,变频器在调节水泵转速,这样形成一个闭环控制系统,根据用水量的变化,随时调节水泵运行速率且能循环切换水泵机组。实现有效节能的恒压供水。
在水泵由变频转工频运行方面,做了详细的阐述,设计出了循环切换的控制电路和基于西门子s7-200PLC的控制程序。并利用s7-200的仿真软件进行了水泵循环切换,变频转工频的仿真运行。
关键词: PLC;变频调速;循环切换;恒压供水;
Abstract
With the rapid development of social economy, the people's life quality and water supply system reliability and taller to the requirement of; Plus the current energy shortage of, use advanced automation technology, control technology and communication technology, the design of high performance, high energy saving, can adapt to different areas of constant pressure water supply system to become inevitable. This thesis aims to the requirements of the water supply of water works, designed a set of by PLC, frequency converter, pressure transmitter, many sets of pump unit, computers and other main components based on PLC, frequency conversion of the constant pressure water supply system. System effectively solved the deficiency of traditional water supply mode, and increased many auxiliary function, especially improve the reliability of system.
This paper analyzes the frequency control principle of constant pressure water supply system, characteristics, and compared with the traditional way of constant pressure water supply advantage. System using pressure transmitter will be measured water pipe pressure feedback to PLC, PLC after operation simulation signal to frequency converter, inverter in adjusting speed, this pump form a closed-loop control system according to the change of water pump operation, adjust rate and can cycle switching pump unit. To realize efficient energy-saving of constant pressure water supply.
The water pump power frequency by frequency conversion turn on running, this paper expounds in detail the circular switch, the design gives the control circuit and based on Siemens s7-200 PLC control procedures. And using the simulation software s7-200 the pump circulation switch, the simulation of power frequency inverter turn operation.
Keywords:PLC,Frequency conversion,Circulation switch,Constant pressure water supply
目 录
第一章 绪论 1
1.1背景介绍 1
1.2变频恒压供水特点 2
第二章 系统理论分析及控制方案的确定 3
2.1 供水系统要求 3
2.2变频恒压供水系统原理 3
2.3变频恒压供水系统控制方案的确定 4
2.3.1 供水系统的控制流程 4
2.3.2 总体设计 7
第三章 系统的硬件设计 8
3.1系统主要配置 8
3.1.1 可编程序控制器简介 8
3.1.2 变频器简介 10
3.2 系统配置选型 14
3.2.1 PLC的选型 14
3.2.2 变频器的选择 16
3.2.3 水泵机组的选型 17
3.2.4 压力变送器的选择 18
3.3 系统主电路设计 18
3.4 系统控制电路设计 19
3.5 PLC的I/O地址分配 20
3.6 变频器的参数设置 21
第四章 软件设计 23
4.1主程序流程图分析设计 23
4.1.1 系统供水流程 23
4.1.2 系统流程图 24
4.1.3 供水泵切换分析 25
4.1.4 循环切换实现 25
4.2 系统控制程序设计 27
4.3 PID控制及其控制算法 37
第五章 系统仿真 41
结 论 47
参考文献 48
谢 辞 49
随着社会经济的高速发展,人们对生活供水的质量和供水系统的可靠性的要求越来越高;再加上目前能源的紧缺,利用先进的自动化技术、控制技术以及通讯技术,设计出高性能、高节能、能适应不同领域的恒压供水系统以成为必然。本论文针对自来水厂的供水要求,设计了一套由PLC、变频器、压力变送器、多台水泵机组、计算机等主要设备构成的基于PLC变频调速的恒压供水系统。系统有效地解决了传统供水方式的不足,并且增加了许多辅助功能,尤其提高了系统的可靠性。
本文分析了变频调速恒压供水系统的原理,特点,及相对于传统恒压供水方式的优势。系统利用压力变送器将出水管网测得的水压反馈给PLC,PLC经过运算将模拟信号送给变频器,变频器在调节水泵转速,这样形成一个闭环控制系统,根据用水量的变化,随时调节水泵运行速率且能循环切换水泵机组。实现有效节能的恒压供水。
在水泵由变频转工频运行方面,做了详细的阐述,设计出了循环切换的控制电路和基于西门子s7-200PLC的控制程序。并利用s7-200的仿真软件进行了水泵循环切换,变频转工频的仿真运行。
关键词: PLC;变频调速;循环切换;恒压供水;
Abstract
With the rapid development of social economy, the people's life quality and water supply system reliability and taller to the requirement of; Plus the current energy shortage of, use advanced automation technology, control technology and communication technology, the design of high performance, high energy saving, can adapt to different areas of constant pressure water supply system to become inevitable. This thesis aims to the requirements of the water supply of water works, designed a set of by PLC, frequency converter, pressure transmitter, many sets of pump unit, computers and other main components based on PLC, frequency conversion of the constant pressure water supply system. System effectively solved the deficiency of traditional water supply mode, and increased many auxiliary function, especially improve the reliability of system.
This paper analyzes the frequency control principle of constant pressure water supply system, characteristics, and compared with the traditional way of constant pressure water supply advantage. System using pressure transmitter will be measured water pipe pressure feedback to PLC, PLC after operation simulation signal to frequency converter, inverter in adjusting speed, this pump form a closed-loop control system according to the change of water pump operation, adjust rate and can cycle switching pump unit. To realize efficient energy-saving of constant pressure water supply.
The water pump power frequency by frequency conversion turn on running, this paper expounds in detail the circular switch, the design gives the control circuit and based on Siemens s7-200 PLC control procedures. And using the simulation software s7-200 the pump circulation switch, the simulation of power frequency inverter turn operation.
Keywords:PLC,Frequency conversion,Circulation switch,Constant pressure water supply
目 录
第一章 绪论 1
1.1背景介绍 1
1.2变频恒压供水特点 2
第二章 系统理论分析及控制方案的确定 3
2.1 供水系统要求 3
2.2变频恒压供水系统原理 3
2.3变频恒压供水系统控制方案的确定 4
2.3.1 供水系统的控制流程 4
2.3.2 总体设计 7
第三章 系统的硬件设计 8
3.1系统主要配置 8
3.1.1 可编程序控制器简介 8
3.1.2 变频器简介 10
3.2 系统配置选型 14
3.2.1 PLC的选型 14
3.2.2 变频器的选择 16
3.2.3 水泵机组的选型 17
3.2.4 压力变送器的选择 18
3.3 系统主电路设计 18
3.4 系统控制电路设计 19
3.5 PLC的I/O地址分配 20
3.6 变频器的参数设置 21
第四章 软件设计 23
4.1主程序流程图分析设计 23
4.1.1 系统供水流程 23
4.1.2 系统流程图 24
4.1.3 供水泵切换分析 25
4.1.4 循环切换实现 25
4.2 系统控制程序设计 27
4.3 PID控制及其控制算法 37
第五章 系统仿真 41
结 论 47
参考文献 48
谢 辞 49