毕业论文-频供水系统设计.docVIP

摘 要 随着社会经济的迅速发展，人们对供水质量和供水系统可靠性的要求不断提高，再加上目前能源紧缺，利用先进的自动化技术、控制技术以及通讯技术，设计高性能、高节能、能适应不同领域的恒压供水系统成为必然趋势。 本文首先根据管网和水泵的运行特性曲线，阐明了供水系统的变频调速节能原理，接着分析了变频恒压供水的原理及系统的组成结构。本文采用变频器和PLC实现恒压供水和数据传输。然后用PID对系统中的恒压控制器进行设计，并对系统的硬件设计进行了详细的介绍。 本文构建了基于力控软件的泵站监测系统框架，提出了以力控软件为监控软件，可编程序控制器(PLC)采用西门子S7-200系列作为下位机的泵站分布式控制系统方案。初步实现了泵站的自动动态采集信号，对监控参数进行趋势分析、趋势预报且能实施报警功能，对各种监控参数的报表也能自动生成并打印，同时利用基于GPRS无线网络，实现了泵站的远程监控，基本满足了用户的需求。 关键词：变频调速恒压供水；PLC可编程控制器；数据采集 Abstract With the rapid development of social economy, it demands the better of water supply’s quality and reliability of water supply system. Meanwhile energy resources are seriously lack. So it is inevitable tendency to design water supply system which has high function and saves on energy well, with the help of advanced technique of automation, control and communication. At the same time this system can adapt to different water supply fields. This paper explains ester supply system’s energy-saving principle of pump VF speed control according to characteristic curve of running pipelines and water pump, analyzes the structure of VF speed regulating constant pressure water supply. In this paper, on the basis of above PLC and inverter’s method fits water supply system and data transmission very well. Then constant pressure supply water controller is designed by PID control respectively, and the design of the system’s hardware and soften is introduced. This paper establishes the frame of pumping station supervisory system which is based on configuration software，and proposes the project to develop the distributed control system of pumping station using configuration softwareas supervisory software and Siemens S7-200 as hypogenous machine. It can collect signal automatically, execute trend analysis about the supervisory print the parameter and data. So it fulfills reused, extended and maintained easily, parameter, forecast alarm, and satisfies the main need of user. Key words: VF speed frequency to working constant p