基于plc的小区变频恒压供水系统设计 大学毕设论文.doc

PLC 在小区恒压供水中的应用摘要本设计对环保、节能、自动补压型给水设备作了介绍。从节能科技的实践出发, 阐述了变频调速技术在高楼给水设备中的应用。以 PLC 电路控制方式,介绍了智能水压控制系统的工作原理及 PLC 控制系统。在分析水压控制的工作流程的基础上,给出了 PLC 控制系统的硬件和软件设计。智能水压控制系统的基本控制策略是: 采用电动机调速装置与可编程控制器( PLC )构成控制系统,进行优化控制, 完成供水压力的恒定控制,在管网流量变化时达到稳定供水压力和节约电能的目的。系统的控制目标是泵站总管的出水压力,系统设定的给水压力值与反馈的总管压力实际值进行比较,其差值输入变频器运算处理后,发出控制指令, 控制泵电动机的投运台数和运行变量泵电动机的转速,从而达到给水总管压力稳定在设定的压力值上。关键词: PLC 可编程序控制器、压力传感器、变频器 PID 、 PLC 控制、恒压供水。 PLC 在小区恒压供水中的应用 Abstract This graduation practice's turn to have filled up pressure type water supply equipment work to environmental protection, energy conservation, automation introduce that. The frequency conversion speed regulation technology having set off from energy conservation science and technology practice , expounding hits the target in high building water supply equipment the intelligent hydraulic pressure control system principle of work and the PLC control system. In the analysis hydraulic pressure control work flow foundation, has produced the PLC control system hardware and the software design. The intelligent hydraulic pressure control system basic control strategy is: Uses the electric motor speeder and the programmable controller (PLC) constitutes the control system, carries on the optimized pletes the water supply pressure the constant control, when work current capacity change achieved the stable water supply pressure and saves the electrical energy the goal. The system control goal is the pumping station main pipe water leakage pressure, the system hypothesis carries on parison for the hydraulic pressure value and the feedback main pipe pressure actual value, after its interpolation inputs CPU operation processing, sends out the mand, the control pumps the electric motor to throw transports the Taiwan number and the movement variable displacement pump electric motor rotational speed, thus achieved stabilizes for the water main pipe pressure in hypothesis Pressure. Keyword: Frequency transformer PID,PLC controlled ,The constant vo