PLC在港口皮带输送系统节能控制中的应用研究

发布时间：2018-08-28 18:25

【摘要】：在国家发展绿色低碳循环经济的大背景下,做好港口行业的节能降耗工作成为了必然趋势。皮带输送系统是港口煤炭、矿石等散货码头的重要组成部分,散贷的运输较易受现场条件的影响而造成皮带负荷变化大,而驱动电机一直处于工频运行,这就会造成电能浪费及机械损耗增加,由于皮带的驱动电机功率都较大,所以研究并挖潜其节能空间,对于减少港口的能源消耗,提高其能源利用效率具有十分积极的意义。本课题根据徐州某港口的需求,以其3#皮带输送系统为研究对象,利用PLC技术为基础,变频器及组态软件为辅开发设计了对电机进行变频调速的自动控制系统。为实现自动变频调速控制系统的开发设计,课题的核心工作包括：掌握PLC的组成、各部分的功能及工作原理,变频调速的基本原理,变频器的基本结构及应用特点;设计变频调速自动控制的整体方案,进行硬件选型及电路设计,并利用STEP7开发实现PLC控制的梯形图程序;采用组态软件进行远程监控界面的构建。系统可以根据皮带上的物料负荷实时调整电机的频率和皮带运行速度：当负荷较小时,降低电机运行频率和皮带运行速度;当负荷较大时,提高电机运行频率和皮带运行速度。通过本课题的设计,加深了对PLC控制系统设计及三相交流异步电机变频调速的理解,并为后续的项目和推广提供了理论指导和经验积累。
[Abstract]:Under the background of national development of green low carbon cycle economy, it has become an inevitable trend to do well the energy saving and consumption reduction in port industry. The belt conveyance system is an important part of the port coal, ore and other bulk wharves. The transportation of bulk loans is easy to be affected by the field conditions and the belt load changes greatly, while the driving motor is always running at the power frequency. This will lead to the waste of electric energy and the increase of mechanical loss. Because the power of the belt driving motor is large, it is of great significance to study and tap the energy saving space for reducing the energy consumption of the port and improving its energy utilization efficiency. According to the requirements of a certain port in Xuzhou, the automatic control system for frequency conversion of motor is designed based on PLC technology, frequency converter and configuration software. In order to realize the development and design of the automatic frequency conversion speed control system, the core work of the subject includes: mastering the composition of PLC, the function and working principle of each part, the basic principle of frequency conversion speed regulation, the basic structure and application characteristics of frequency converter; The whole scheme of frequency conversion automatic control is designed, the hardware selection and circuit design are carried out, and the ladder diagram program of PLC control is developed by using STEP7, and the remote monitoring interface is constructed by configuration software. According to the material load on the belt, the system can adjust the frequency of the motor and the running speed of the belt in real time. When the load is small, the frequency of the motor and the speed of the belt can be reduced, and when the load is high, the frequency of the motor and the speed of the belt can be increased. Through the design of this subject, the understanding of PLC control system design and frequency conversion speed regulation of three-phase AC asynchronous motor is deepened, and the theoretical guidance and experience accumulation are provided for the subsequent project and popularization.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U653.922

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