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1、i 基于基于 plc 的水塔水位设计的水塔水位设计 摘要摘要:传统方式的水塔水位控制需要消耗的电能比较多、水压变化比较大而 且容易引起水体水质的二次污染，在一定程度上，可以说是无法满足现今居民对 供水控制系统稳定性和供水质量的要求。把先进的自动化控制技术、变频技术等 应用于水位控制系统，不仅可以减少能源的损耗，还可以改善供水过程中出现的 问题，在一定程度上，还具有推动社会向前发展的积极作用。 水塔水位控制系统是采用变频调速技术和 PLC 技术实现自动控制水位的机电 一体化水系统。文章中所讲述的水塔水位控制系统以水塔水位控制压力为研究对 象，采用 PID 控制算法，通过 PLC 控制变频器，进而
2、控制水泵机组转速，最终 达到恒压水塔水位控制的目的。 本文介绍了自动水塔水位控制系统在本地某小区水塔供水水位控制中的 应用。通过 PLC 控制变频器的输出频率，再由变频器控制水泵电机的转速来实现 的恒压水塔水位控制系统，并且选择 PID 控制设计中的参数，来达到最优控制的 目的。该系统设计的关键在于维持管网水压趋于恒定值，考虑到用户数量较多加 之没有固定的用水时间，管网内水压会产生一定的波动，所以选择使用 PID 方法 来构建数学模型进行设计，并在实际应用中得到了令人满意的效果。 关键词：关键词：恒压供水；可编定程序控制器；PID 控制；变频调速。 ii Water level design
3、of water tower based on PLC Abstract： The traditional way of water tower level control needs more power consumption, greater changes in water pressure and easy to cause secondary pollution of water quality. To a certain extent, it can not meet the requirements of the stability and quality of water s
4、upply control system for the residents. Applying advanced automatic control technology and frequency conversion technology to water level control system can not only reduce energy consumption, but also improve the problems in the process of water supply. To a certain extent, it also plays an active
5、role in promoting social development. The water level control system of water tower is an electromechanical integrated water system which uses frequency conversion and speed regulation technology and PLC technology to realize automatic water level control. The water tower water level control system
6、described in this paper takes the water tower water level control pressure as the research object, adopts the PID control algorithm, controls the frequency converter through the PLC, and then controls the speed of the pump unit, finally achieves the goal of constant pressure water tower water level
7、control. This paper introduces the application of automatic water tower water level control system in water tower water level control of a local residential area. The output frequency of frequency converter is controlled by PLC, then the speed of pump motor is controlled by frequency converter to re
8、alize the constant pressure water tower water level control system, and the parameters of PID control design are selected to achieve the purpose of optimal control. The key to the design of the system is to maintain the constant water pressure of the pipeline network. Considering the large number of
9、 users and the lack of fixed water consumption time, the water pressure in the pipeline network will fluctuate to a certain extent, so the PID method is chosen to construct the mathematical model for the design, and satisfactory results are obtained in practical application. Key Words: Constant pres
10、sure water supply; Programmable controller; PID control; Frequency conversion speed regulation. iii 目录 前言前言 .4 4 绪论绪论 .5 5 1。1 课题研究背景与研究意义 .5 12 国内外研发现状及发展.5 3 研究内容 .6 第二章第二章 基于基于 PLCPLC 的设计原理的设计原理 .6 6 2。1 水位调控原理 .6 2。2 供水的两种方式 .7 22. 1 手动方式 .7 2。2 自动运行方式.7 2. 3 系统硬件介绍 .7 第三章第三章 基于基于 PLCPLC 的水塔水位设计的水塔水位设计 .9 9 3。1 水塔水位的方案选择 .9 3。2 系统电流路线设计 .9 32. 1 水塔水位控制图 .9 3.2. 2 输入/输出设备及 I/O 点分配 .9 3.2. 3 系统工作流程 .9 3. 2. 4 控制系统 .10 3. 2. 5 执行机构 .10 3. 2. 6 报警装置 .10 3. 2. 7 人机界面 .11 第四章总结第四章总结 .1111 致致 谢谢 .1212 参考文献参考文献 .1313 附录附录 .1515 1 前言前言 众所周知，科学技术正在不断地
