（毕业设计论文）变频供水远程控制系统设计.doc

w w 变频供水远程控制系统设计 摘 要 变频调速恒压供水系统可以提高供水系统的稳定性和可靠性，方便地实现供水系统的集中管理与监控，同时系统具有良好节能性，这在能量日益紧缺的今天尤为重要，所以研究设计该系统，对于提高企业效率以及人们的生活水平、降低能耗等方面具有重要的现实意义。本设计是针对居民生活用水/消防用水而设计，采用PLC控制的变频调速供水系统，由PLC进行逻辑控制，由变频器进行压力调节，再经过PID运算，通过PLC控制变频与工频切换，实现闭环自动调节恒压供水。 实验结果表明，该系统具有压力稳定，结构简单，工作可靠等优点。论文论述了采用多泵供水方案的合理性，分析了多泵供水方式的各种供水状态及转换条件，分析了电机由变频转工频运行方式的切换过程及存在的问题，给出了实现有效状态循环转换控制的电气设计方案和PLC控制程序设计方案。 变频恒压供水包括生活用水的恒压控制和消防用水的恒压控制，保证了供水的质量，以变频器为主机的控制系统丰富了系统的控制功能，提高了系统的可靠性。因此,采用PLC和变频器为核心部件构成的变频恒压供水系统, 具有良好的技术、经济效益, 有广阔的应用前景和推广价值。 关键词：PLC；变频调速；PID控制；恒压供水；MCGS Frequency of water supply remote control system design Abstract Frequency control water supply system can improve the stability and reliability of water supply systems, easily achieve the centralized management and monitoring of the water supply system.at the same time the system has good energy efficiency.This is particularly important in the increasing scarcity of energy today. so the study design of the system has important practical significance for improving business efficiency and peoples living standards,and at the same time reducing energy consumption. The design is designed for the living water / fire water, the frequency control water supply system with PLC control, logic control by the PLC, pressure regulation by the inverter, and then after the PID operation. Frequency switching frequency and work through the PLC control to achieve closed-loop automatic adjustment of the constant pressure water supply. The experimental results show that the system has the advantages of stable pressure, simple structure, reliable work. the paper discusses the rationality for multi-pumps water supply program, a variety of water supply status of the multi-pumps water supply and conversion conditions. analysis of the changing of motor by the inverter frequency operation mode switching process and the problems are given effective state cyclic change of control of the electrical design and PLC control program design. The constant pressure water supply,