基于PLC的泵站供水控制系统的设计  

Design of water supply control system based on PLC

作　　者：刘宜[1] 方桂笋[1] 李晨晨[1] 刘景伟 

机构地区：[1]兰州理工大学流体动力与控制学院,甘肃兰州730050 [2]扶沟县城关镇第一初级中学,河南扶沟461300

出　　处：《排灌机械》2007年第6期17-20,共4页Drainage and Irrigation Machinery

摘　　要：针对恒速泵供水系统中依靠节流调节维持水压稳定的一些缺陷,为了从根本上解决系统用电效率低、供水压力波动大等疑难问题,以PLC和变频器为控制中心,设计了一套变频调速恒压供水系统。在此系统中,PLC将压力设定值与测量值的偏差经PID运算后得到的控制量作用到变频器,从而系统可通过变频器控制水泵的转速来调节管网的压力,实现恒压供水的目的。该系统供水压力稳定,自动化程度高,节能效果显著,长期运行稳定可靠。The automatic water supply system with speed adjusted by PLC and VVVF（ Variable Voltage and Variable Frequency） was introduced. PLC was used to process the logical and PID control, and VVVF was used to adjust the feed water pump speed. For this water supply system under constant pressure it is designed a suit of PLC controlling system based on variable frequency speed regulating technology. The system consists of pressure sensors, transducer, pumps, relays, contact device and so on. By comparing the setting value and measuring value of pressures, the deviation is obtained. Then the control volume is obtained by the PID operation to affect the transducer. Thus the pump rotational speed is controlled through transducer to adjust the pressure of the pipe net work and to realize the constant pressure water supply goal. The constant feed water pressure with highly automatic operation could be provided. The control system was energy-saving with steady work conditions.

关 键 词：泵站 可编程控制器 供水 变频调速 节能 

分 类 号：TH311[机械工程—机械制造及自动化] S277[农业科学—农业水土工程]