1、 本科毕业论文(设计) 题 目 变频控制恒压供水模拟系统 摘 要 随着社会主义市场经济的发展,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的趋势。 变频恒压供水系统已在国内许多实际的供水控制系统中得到应用,并取得稳定 可靠的运行效果和良好的节能效果。经实践证明该系统具有高度的可靠性和实时 性,极大地提高了供水的质量,并且节省了人力,具有明显的经济效益和社会效益。 本控制系统是对现场恒压供水系统的模拟,控制核心单元 PLC 根据压力设定信 号与现场压力的反馈信号经过 PL
2、C 的分析和计算, 将控制信号送到 PLC 的输出端口, 通过开关量驱动切换继电器组,以此来协调投入工作的电机的台数,并完成电机的 起停、变频与工频的切换。通过调整电机组中投入的电机的台数和控制电机组中每 台电机的工作状态,使供水系统的的工作压力恒定,进而达到恒压供水的目的。 关键字:变频调速;恒压供水;PLC;变频;工频。 Frequency Conversion Constant Pressure Water-supply Simulation System Abstract With the rapid development of socialistic marketing econo
3、my,there is a growing demand for better quality of water supply and higher reliability of supply system. In addition ,considering the current common energy crisis, achieving the scheme of automatingthe water supply system. So it is an inevitable tendency to design and create an energy-savingconstant
4、-pressure water supply system of excellent performance with the help of advancedtechniques of automation,monitor-control system; and communication. Meanwhile, the System can also adapt to various water Supply regions. Frequency Conversion Constant Pressure Water-supply System, which has initially been completed with reliable performance and excellent energy-saving effect, proves to possess high reliability and real-time quality. The system can not only remarkably improve the quality of w