基于变频器内置PID模块和控制器模块的恒压供水系统设计

The system design of constant pressure water supply based on inverter build—in PID and control module

由于传统的供水系统设备结构复杂以及自动化程度低设备运行效率低,导致供水效率低、供水不稳定、能耗大、造价高等问题,提出一种内置PID功能模块与控制器模块的变频器,水泵和压力传感器等装置组成的一套智能恒压供水系统。系统自带的控制器模块和PID功能,不仅满足对生活供水的质量、可靠性、节能型等一系列要求,而且利用变频器自带的控制模块,简化控制模型,将以前的机电联控系统中PLC功能模块全部集中到变频器中,降低了成本,解决了PLC外加扩展PID的算法编程难度大,调试困难的问题。运用管网末端的压力传感器收集电压信号输入控制器,进行压力比对后,自带的PID功能调节水泵转速,改变水泵流量,从而达到压力恒定。

Because the traditional water supply system equipment structure is complex and the automation degree is low,the equipment operation efficiency is low,resulting in the water supply efficiency is low,the water supply is unstable,the energy consumption is high,the cost is high and so on.The system’s own controller module and PID function not only meet a series of requirements for the quality,reliability and energy saving of domestic water supply,but also use the control module brought by the frequency converter to simplify the control model,concentrate all the PLC function modules in the previous electromechanical joint control system into the frequency converter,reduce the cost,and solve the problem of difficult programming and debugging of the algorithm with extended PID outside PLC.Using the pressure sensor at the end of the pipe network to collect the voltage signal input controller,after the pressure comparison,the PID function of the self-contained adjusts the speed of the pump and changes the flow rate of the pump,thus achieving constant pressure.