基于PLC控制的城市恒压供水系统学士学位论文哈尔滨理工大学.docVIP

基于PLC控制的城市恒压供水系统 摘要 随着市场经济的发展，人民的生活水平不断提高。人们对供水质量和供水系统可靠性的要求也不断提高；同时，城市需水量日益加大，以及目前能源紧缺，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的趋势。 论文分析了采取变频调速方式实现恒压供水相对于传统的阀门控制恒压供水方式的节能机理。通过对变频器内置PID模块参数的预置，利用远传压力表的水压反馈量，构成闭环系统，根据用水量的变化，采取PID调节方式，在全流量范围内利用变频泵的连续调节和工频泵的分级调节相结合，实现恒压供水且有效节能。 本文介绍了采用PLC控制的变频调速供水系统,由PLC进行逻辑控制,由变频器进行压力凋节，通过PLC控制变频与工频切换,实现闭环自动调节恒压变量供水运行结果表明,该系统具有压力稳定,结构简单,工作可靠等特点。该系统具有高度的可靠性和实时性，极大地提高供水的质量，并且节省了人力，具有显著的经济效益和社会效益。 关键词 恒压供水；变频调速；远程监控；PLC Pressure Constant City Water Supply System Based on PLC control Abstract With the development of market economy, peoples living standards improved. People of water quality and water requirements continuously improve system reliability; Meanwhile, the growing urban water demand increase, and the current energy shortage, the use of advanced automation technology, control technology, and communication technology, design high-performance, high energy, able to adapt different areas of water supply systems has become an inevitable trend. Based on the analysis of the variable frequency speed constant pressure water supply to achieve the energy saving mechanism of the traditional valve control constant pressure water supply mode. The converter with built-in PID module parameters preset, using a remote pressure gauge pressure feedback, to form a closed loop system, according to the change of water, take the PID regulation, in the whole flux range using the hierarchical continuous adjusting variable pump and general pump regulator combination, the realization of constant pressure water supply and effective energy saving. This article describes the use of PLC control frequency control water supply system, the logic is controlled by PLC, withered by the inverter section of the pressure, frequency and frequency switching through PLC control, closed-loop automatic adjustment constant pressure variable water supply, the results show that the system with pressure stability, simple structure, reliable work. The system