題目：基于plc和組態(tài)軟件的恒壓供水系統(tǒng)設(shè)計(jì)

摘 要

本論文根據(jù)中國(guó)城市小區(qū)的供水要求，設(shè)計(jì)了一套基于PLC的變頻調(diào)速恒壓供水系統(tǒng), 并利用組態(tài)軟件開(kāi)發(fā)良好的運(yùn)行管理界面。變頻恒壓供水系統(tǒng)由可編程控制器、變頻器、水泵機(jī)組、壓力傳感器、工控機(jī)等構(gòu)成。
本系統(tǒng)包含三臺(tái)水泵電機(jī)，它們組成變頻循環(huán)運(yùn)行方式。采用變頻器實(shí)現(xiàn)對(duì)三相水泵電機(jī)的軟啟動(dòng)和變頻調(diào)速，運(yùn)行切換采用“先啟先?！钡脑瓌t。壓力傳感器檢測(cè)當(dāng)前水壓信號(hào)，送入PLC與設(shè)定值比較后進(jìn)行PID運(yùn)算，從而控制變頻器的輸出電壓和頻率，進(jìn)而改變水泵電機(jī)的轉(zhuǎn)速來(lái)改變供水量，最終保持管網(wǎng)壓力穩(wěn)定在設(shè)定值附近。通過(guò)工控機(jī)與PLC的連接，采用組態(tài)軟件完成系統(tǒng)監(jiān)控，實(shí)現(xiàn)了運(yùn)行狀態(tài)動(dòng)態(tài)顯示及數(shù)據(jù)、報(bào)警的查詢(xún)。

關(guān)鍵詞：變頻調(diào)速，恒壓供水，PLC，組態(tài)軟件

ABSTRACT

According to the requirement of China's urban water supply, this paper designs a set of water supply system of frequecey control of constant voltage based on PLC, and have developed good operation management interface using Supervision Control and Data Acquisition.The system is made up of PLC, transducer,units of pumps,pressure sensor and control machine and so on.
This system is formed by three pump generators,and they 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 export 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 group form software consummately systematic monitoring,have realized operation state development to show and data,report to the police inquiry.

Keywords: variable frequency speed-regulating, constant-pressure water supply, PLC, supervision control and data acquisition

參考文獻(xiàn)

1.崔金貴.變頻調(diào)速恒壓供水在建筑給水應(yīng)用的理論探討[J],蘭州鐵道學(xué)院學(xué)報(bào),2000,1:84-88
2.張燕賓.變頻調(diào)速應(yīng)用實(shí)踐[M].北京:機(jī)械工業(yè)出版社,2002,135-137
3.金傳偉,毛宗源.變頻調(diào)速技術(shù)在水泵控制系統(tǒng)中的應(yīng)用[J],電子技術(shù)應(yīng)用,2000,2:38-39
4.張燕賓.SPWM變頻調(diào)速應(yīng)用技術(shù)[M].北京:機(jī)械工業(yè)出版社,2002,244-251
5.Cynthia Cooper.Programmable Logic Controller[J],the free wikipedia encyclopedia,2002,3:1-8
6.廖常初.PLC編程及應(yīng)用[M].北京:機(jī)械工業(yè)出版社,2008,14-16
7.胡崇岳.現(xiàn)代交流調(diào)速技術(shù)[M].北京:機(jī)械工業(yè)出版社,1998,316-317
8.馬桂梅,譚光儀,陳次昌.泵變頻調(diào)速時(shí)的節(jié)能方案討論[J],四川工業(yè)學(xué)院學(xué)報(bào),2003,3:5-7
9.林俊贊,李雄松,尹元日.PLC在恒壓供水控制系統(tǒng)中的應(yīng)用[J],電機(jī)電器技術(shù),1999,3:45-48
10.吳浩烈.電機(jī)及電力拖動(dòng)基礎(chǔ)[M].重慶:重慶大學(xué)出版社,1996, 173-174
11.楊東平.變頻調(diào)速恒壓供水系統(tǒng)綜述[J],南寧職業(yè)技術(shù)學(xué)院學(xué)報(bào),2004,4:38-45
12.耿紅旗,呂冬艷.可編程序控制器應(yīng)用教程[M].北京:中國(guó)水利水電出版社,2001,45-60
13.M K Chung.Optimum values of design variables versus specific speed for centrifugal pumps[J], Proceeding of the Institution of Mechanieal Engineers, 1999, 3: 219-227
14.鄭兆生,張偉,鄭新志.PLC及變頻器恒壓供水控制系統(tǒng)設(shè)計(jì)[J],山東輕工業(yè)學(xué)院學(xué)報(bào),2007,3:123-138
15.XueDun-song.The energy-saving technolgy of water-injection systems in domestic and abroad oil filed[J],Energy Convervation of Oilfiled 1998,9:11-25
16.Russell P Fleming.Introducing the variable speed pump[J],NFPA Journal, 2004,5: 26-33
17.邵裕森,戴先中.過(guò)程控制工程[M].北京:機(jī)械工業(yè)出版社,2007,166-16