冷冻站盐水泵变频调速系统 电气工程及其自动化专业毕业设计 毕业论文.doc

本科毕业设计说明书 冷冻站盐水泵变频调速系统 Frozen Station Salt Water Pump Frequency conversion Governor System 学院（部）： 电气与信息工程学院 专业班级：电气工程及其自动化 学生姓名： 指导教师： 年 月 日 冷冻站盐水泵变频调速系统 摘要 近年来，交流调速发展十分迅速，打破了过去直流拖动在调速领域中的统治地位，交流拖动进入了与直流拖动相媲美、相抗衡的时代。本论文结合我国的现状，并利用在校期间掌握的专业技能，设计了一套利用PLC变频调速器以传感器为基础的系统。0-20mA模拟量信号送入PLC，在通过A/D转换，执行PID程序，D/A转换后，输出控制信号给变频器，来自动调节变频器的输出频率，来自动调节变频器的输出频率，从而改变拖动水泵的电动机的转速，达到调节流量的作用。交流变频调速是交流电动机调速方法中最优的方案，采用变频器对盐水泵机械进行调速来调节流量的方法，对节约电能，提高经济效益具有重要意义。 在文章中，我们研究了采用可编程控制器控制的变频器对盐水泵进行调速所产生的节能减排效益，重点提到了冻结站盐水泵变频节能系统的硬件组成及软件设计。还提到了对于电动机、变频器、PLC的结构和型号选择等相关方面。 关键词：冻结站，变频器，盐水泵，变频器，节能，闭环调速 Coal freeze Station Salt Water Pumping Frequency GovernorSystem ABSTRACT In recent years, the development of AC variable speed very quickly, breaking the dominance of the DC drive speed field, AC Drive has entered the era of comparable DC drive, to compete. This paper combines the status quo of Chinas coal mines to freeze the station, and the use of professional skills mastered during the school pump flow design a PLC frequency control sensor-based closed-loop speed control system Frequency control technology is a modern integrated electrical and computer control of advanced technology, widely used in the field of pump energy efficiency and constant pressure water supply.Frequency control technology for the pump control system with speed performance, significant energy saving effect, run the process safe and reliable advantages. Vigorously promote energy conservation, promote the use of this set of modern and advanced power electronics technology and computer technology in one high-tech energy-saving devices for raising labor productivity, reduce energy consumption is of great practical significance. It can be said that the frequency conversion technology is a country wide application prospects of high-tech. Inverter performance has been greatly enhanced due to the rapid development of electronic technology, it can achieve a soft start soft stop control equipment, not