變頻調(diào)速恒壓供水系統(tǒng) 變頻器plc

摘       要
我國(guó)水廠從七十年代開(kāi)始應(yīng)用集中巡檢，到八十年代隨著工業(yè)水平的提高和計(jì)算機(jī)技術(shù)的發(fā)展，自動(dòng)控制技術(shù)發(fā)展得很快。隨著自動(dòng)控制技術(shù)的廣泛應(yīng)用，大城市的水廠自動(dòng)化生產(chǎn)程度較高，但中小城市水廠尤其是老水廠自動(dòng)控制系統(tǒng)配置相對(duì)落后。
本論文在分析和比較了國(guó)內(nèi)外供水自動(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(guó)中小城市供水廠的現(xiàn)狀，設(shè)計(jì)了一套以變頻調(diào)速技術(shù)為基礎(chǔ)的恒壓供水計(jì)算機(jī)監(jiān)控系統(tǒng)。該系統(tǒng)綜合運(yùn)用計(jì)算機(jī)技術(shù)、變頻調(diào)速技術(shù)以及自動(dòng)控制技術(shù)，實(shí)現(xiàn)了恒壓供水的參數(shù)整定自動(dòng)控制，保證了隨時(shí)供水系統(tǒng)維持在最佳運(yùn)行狀況。
論文對(duì)計(jì)算機(jī)控制系統(tǒng)中的上下位機(jī)之間的串行通信進(jìn)行了分析和研究，運(yùn)用組件技術(shù)和多線(xiàn)程技術(shù)開(kāi)發(fā)了串行通信控件，在自定義通信協(xié)議的基礎(chǔ)上設(shè)計(jì)了相應(yīng)的串口通信程序，實(shí)現(xiàn)了上位機(jī)和可編程序控制器之間的實(shí)時(shí)通訊及遠(yuǎn)程控制功能。并在此基礎(chǔ)上研制開(kāi)發(fā)了一套用于供水系統(tǒng)的信息管理及監(jiān)控系統(tǒng)軟件，分析了軟件設(shè)計(jì)中的總體結(jié)構(gòu)設(shè)計(jì)、數(shù)據(jù)庫(kù)設(shè)計(jì)、數(shù)據(jù)處理軟件設(shè)計(jì)等的實(shí)現(xiàn)。
現(xiàn)場(chǎng)調(diào)試和運(yùn)行表明，該系統(tǒng)能夠?qū)�供水過(guò)程進(jìn)行自動(dòng)控制，能夠有效地降低能耗，提高生產(chǎn)管理水平。監(jiān)控系統(tǒng)安裝維護(hù)方便，運(yùn)行穩(wěn)定、可靠；監(jiān)控軟件功能齊全，人機(jī)界面友好，使用方便。
關(guān)鍵詞：供水系統(tǒng)    串行通信    信息管理     PLC

 

Abstract

Centralizing scout of waterworks is started to apply in 70s in our country. In the 1980s, with the development of industry and computer technology, automation technology is progressed fast. With the widely applications of automation technology, the automatic degree of waterworks in city is much higher than the correspondence in town. Especially in some old waterworks, the equipment of automatic control system is dropped behind.
On the basis of analyzing and comparing the development and characteristic of domestic and overseas automatic system of water supply, combined with status in quo of the waterworks in our country, this paper designs a suit of computer controlling system based on variable frequency speed-regulating technology. Through using computer technology, variable frequency speed-regulating technology and automation technology, the system can make the water pressure of water supply system constantly by the way of parameters self-tuning. It assuredly makes the water supply system work on all cylinders.
Through analyzing and researching on the serial communication between host computer and PLC of computer control system, a serial communication control is developed base on control technology and multithreading technology. Serial communication program is developed base on the custom communication protocol, the function of real time communication and remote control between host computer and PLC is realized. On the basis of these programs, a information management and real time supervisory control software of water supply system is developed. At the same time, it analyzes the design of frame, database, data management and so on. The realization of these programs is also introduced.
The Operation and experiment demonstrates that the system make the work of water supply automated in some degree. It is good for energy saving and improving the management of waterworks. It’s also facility to mount and maintain, reliable to operating, and precise to supervise and control. The supervisory control software has abundant functions, kind interface and convenience to using.

 

 

Key Word：Water supply system,   PLC,   Information Management
Serial Communication