42391字

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“先啟先停”的原則。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。

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.
目錄
1 緒論 1
1.1 課題的提出 1
1.2 變頻恒壓供水系統(tǒng)的國(guó)內(nèi)外研究現(xiàn)狀 3
1.3 PLC概述 5
1.4 本課題的主要研究?jī)?nèi)容 7
2 系統(tǒng)的理論分析及控制方案確定 8
2.1 變頻恒壓供水系統(tǒng)的理論分析 8
2.2 變頻恒壓供水系統(tǒng)控制方案的確定 11
3 系統(tǒng)的硬件設(shè)計(jì) 19
3.1 系統(tǒng)主要設(shè)備的選型 19
3.2 系統(tǒng)主電路分析及其設(shè)計(jì) 23
3.3 系統(tǒng)控制電路分析及其設(shè)計(jì) 25
3.4 PLC的I/O端口分配及外圍接線圖 27
4 系統(tǒng)的軟件設(shè)計(jì) 31
4.1 系統(tǒng)軟件設(shè)計(jì)分析 31
4.2 PLC程序設(shè)計(jì) 33
4.3 PID控制器參數(shù)整定 40
5 監(jiān)控系統(tǒng)的設(shè)計(jì) 46
5.1 組態(tài)軟件簡(jiǎn)介 46
5.2 監(jiān)控系統(tǒng)的設(shè)計(jì) 46
6 結(jié)束語(yǔ) 51
參考文獻(xiàn) 53
致謝 55
附錄 56
附錄A 英文文獻(xiàn) 56
附錄B 中文翻譯 65
附錄C 主程序梯形圖 71

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