摘要

当前，国内供水行业尚处于发展初期，市政与工业供水技术相对滞后。随着社会主义市场经济的发展和居民生活水平的提升，城市高层住宅数量日益增多，对基础设施尤其是小区供水系统提出了更高要求。

传统供水方式已难以满足现代需求，设计一套基于PLC与变频器的恒压供水系统显得尤为必要。该系统以PLC为核心控制器，负责逻辑控制与多泵协同管理；变频器作为执行机构，通过PID调节实现压力精准控制，确保供水压力稳定在±0.02MPa范围内。系统通过PLC控制变频与工频切换，形成闭环自动调节机制，不仅提高了供水系统的稳定性与可靠性，还显著降低了能耗，较传统系统节能15%以上。

此外，系统具备快速故障响应能力（≤3s），并能实时显示供水压力、泵组运行状态及故障信息，实现了高度自动化与智能化管理。相较于早期单泵系统，多泵协同设计进一步提升了系统的适应性与灵活性。因此，本设计不仅具有显著的经济效益，还对推动供水行业技术进步、满足居民高品质用水需求具有重要意义。

关键词：PLC；变频器；恒压供水系统；PID控制；多泵协同

Abstract

Currently, the domestic water supply industry is still in its infancy, with relatively backward technologies in municipal and industrial water supply. With the development of the socialist market economy and the improvement of residents' living standards, the number of high-rise residential buildings in cities is increasing, posing higher demands on infrastructure, especially community water supply systems. Traditional water supply methods can no longer meet modern needs, making it essential to design a constant pressure water supply system based on PLC and frequency converters. This system utilizes PLC as the core controller for logic control and multi-pump coordination, while the frequency converter, as the actuator, achieves precise pressure control through PID regulation, ensuring stable water supply pressure within ±0.02MPa. By controlling the switching between frequency conversion and power frequency, the system forms a closed-loop automatic regulation mechanism, enhancing the stability and reliability of the water supply system while significantly reducing energy consumption by over 15% compared to traditional systems. Additionally, the system features rapid fault response (≤3s) and real-time display of water supply pressure, pump operation status, and fault information, achieving a high degree of automation and intelligent management. Compared to early single-pump systems, the multi-pump collaborative design further improves the system's adaptability and flexibility. Therefore, this design not only offers significant economic benefits but also promotes technological advancements in the water supply industry and meets residents' high-quality water demands.

Keywords: PLC; Frequency Converter; Constant Pressure Water Supply System; PID Control; Multi-Pump Collaboration