需要购买设计请加我们的QQ962120665，电话18730072785 |
摘 要
本论文结合我国中小城市发电厂的现状，设计了一套基于PLC的变频调速恒压供电自动控制系统。
变频调速恒压供电自动控制系统由可编程控制器、变频器、水泵电机组、传感器、以及控制柜等构成。在变频调速恒压供电系统中，单台水泵的调节是通过变频器来改变电源的频率f来改变电机的转速n，从而改变水泵性能曲线得以实现的。分析水泵的能耗比较图，可以看出利用变频调速实现恒压供电，当转速降低时，流量与转速成正比，功率以转速的三次方下降，与传统供电方式中用阀门节流方式相比，在一定程度上可以减少能量损耗，能够明显节能。
通过编程软件设计了一个用于供电系统压力控制的PID控制器，PID控制器内置在PLC中，该控制器对于压力给定值与测量值的偏差进行处理，实时控制变频器的输出电压和频率，进而改变水泵电动机的转速来改变水泵出电口流量，实现整个供电的压力的自动调节，使压力稳定在设定值附近。
关键词： PLC控制 变频调速 水泵 节能
Abstract
The present paper unifies in our country the small city for the water works present situation, has designed a set based on the PLC frequency conversion velocity modulation constant pressure water supply automatic control system.
In order to pledge water supply, the unit is in the super pressure state usually moving, not only the efficiency is low and power consumption is big, but also Guan Wang in city over a long period of time is in the super pressure running state, and it is also very serious to wear and tear. This thesis combines the middle and small city water supply present situation of factory of our country, and has designed basseting on the fast constant voltage water supply automatic control system of frequency conversion accent of PLC.
The fast constant voltage water supply automatic control system of frequency conversion accent forms by programmable controller and frequency converter and water pump electrical machinery group, sensor as well as control cupboard etc. This system uses frequency converter to pull to move many electromotor to start, moves and accent speed, uses respectively to circulate the method operating of use, by way of super ordinate machine.
Key word: PLC control, frequency conversion velocity modulation, constant pressure water supply, water pump, energy conservation