變頻調(diào)速在城市供水系統(tǒng)中的應(yīng)用

電氣自動(dòng)化論文編號(hào):ZD277  論文字?jǐn)?shù):21472,頁數(shù):50

目 錄
1緒論 1
 1.1變頻調(diào)速恒壓供水的目的和意義 1
 1.2供水系統(tǒng)發(fā)展過程 1
 1.3變頻恒壓供水系統(tǒng)主要特點(diǎn)與應(yīng)用場合 3
 1.4畢業(yè)設(shè)計(jì)任務(wù) 4
2系統(tǒng)的總體分析 5
 2.1系統(tǒng)的工藝要求 5
 2.2系統(tǒng)設(shè)計(jì)分析 5
3變頻供水系統(tǒng)原理 7
 3.1變頻器 7
 3.2變頻器調(diào)速的基本原理 7
3.3變頻器的構(gòu)成 9
3.4變頻器中常用的控制方式 10
 3.5變頻調(diào)速恒壓供水系統(tǒng)分析 12
 3.6 PID調(diào)節(jié) 12
3.6.1 PID調(diào)節(jié)原理和特點(diǎn) 13
3.6.2 PID調(diào)節(jié)參數(shù)的調(diào)整 14
3.6.3 PID調(diào)節(jié)的控制 15
4系統(tǒng)硬件設(shè)計(jì) 16
 4.1系統(tǒng)總體上的規(guī)劃 16
 4.2系統(tǒng)工作流程 17
 4.3系統(tǒng)主電路的設(shè)計(jì) 18
 4.4 PLC控制回路設(shè)計(jì) 19
 4.4.1 PLC可編程控制器的介紹 19
 4.4.2輸入輸出（I/O）分配 27
 4.4.3控制電路 28
 4.5變頻器基本配線圖 30
 4.6主要器件選型 31
5系統(tǒng)的軟件設(shè)計(jì) 36
 5.1程序流程圖 36
 5.2 PLC梯形圖 37
 5.3 PLC指令表 38
6總結(jié) 39
參考文獻(xiàn) 40
致謝 41
附錄A PLC梯形圖 42
附錄B PLC指令表 45

摘 要
 本論文在分析了供水自動(dòng)控制系統(tǒng)的發(fā)展現(xiàn)狀和特點(diǎn)的基礎(chǔ)上，結(jié)合我國城市供水的現(xiàn)狀，設(shè)計(jì)了一套以變頻調(diào)速技術(shù)為基礎(chǔ)的恒壓供水系統(tǒng)。
 本文介紹了恒壓供水的基本原理以及系統(tǒng)構(gòu)成，說明了可編程控制器（PLC）在恒壓供水系統(tǒng)中所擔(dān)任的角色。以及介紹了根據(jù)管網(wǎng)的壓力，通過變頻器控制水泵的轉(zhuǎn)速，使水管中的壓力始終保持在合適的范圍。從而可以解決因樓層太高導(dǎo)致壓力不足及小流量時(shí)能耗大的問題。本文從系統(tǒng)的整體設(shè)計(jì)方案和實(shí)際需求進(jìn)行分析，緊密的聯(lián)系實(shí)際生活的需要，力求做到使系統(tǒng)運(yùn)行穩(wěn)定，操作簡便，解決實(shí)際中問題，保證供水安全、快捷、可靠。為了防止自動(dòng)系統(tǒng)發(fā)生故障，本設(shè)計(jì)做了手動(dòng)控制器。
 
 關(guān)鍵詞：恒壓變頻供水；PLC；變頻器
Application of The Frequency Control of Motor Speed in The City’s Water Supply System（Design Proposal One of PLC and Frequency convertor）
ABSTRACT
 On the basis of analyzing the development and characteristic of automatic system of water supply, combined with the waterworks in our country, this text designs a water supply system based on variable frequency speed-regulating technology.
 This text has introduced the basic principle that constant voltage supplies water and foundation that the system form , have stated the role served as of the programmable controller (PLC ) in the water -supply system of constant voltage. And has introduced according to the network management pressure, controls water pump's rotational speed through the inverter, causes in water pipe's pressure maintains at throughout the appropriate scope, thus may solve the problem which the floor high pressure is too insufficient when small current capacity the energy consumption is big. This text since the whole design plan of the system and actual demand are analysed, the need of close life of intergrating with practice, make every effort to make sure to make the system run steadily, easy and simple to handle, solve and hit the problem actually, guarantee to supply water of the security, swift , reliable.In order to pump water for the people under the uncommon condition of the frequency invertor ,this systerm has designed manual-controller.
 
 Key words： Constant pressure frequency conversion water supply； PLC；frequency convertor