文档介绍：毕业设计说明书
基于组态的智能仪表串级控制系统设计
专业
自动化
学生姓名
班级
学号
指导教师
完成日期
2011年6月5日
基于组态的智能仪表串级控制系统设计
摘要:过程控制系统通常是指工业生产中自动控制系统的被控量是温度、压力、流量、液位、成分、粘度、湿度等这样一些过程变量的系统,具有连续生产过程自动控制、由过程检测和控制仪表组成、被控过程多样,控制方案丰富的特点。而串级控制系统是改善控制过程品质极为有效的方法,因而得到了较为广泛应用。与简单控制系统相比,串级控制系统只是在结构上增加了一个内回路,却能收到显的控制效果。这是因为在串级控制系统中,由于副回路具有快速作用,因此串级控制系统对进入内回路的扰动有很强的克服能力;同时由于有副回路的存在,改善了对象的动态特性,提高了系统的工作频率,且使系统具有一定的自适应能力。水箱是一种时变性、大时滞的被控对象,所以用来作为串级控制系统来控制该对象较为合适。根据水箱液位流量控制的原理,考虑各方面因素,对水箱控制进行系统构建。
本课题利用智能仪表做控制器,结合组态监控软件设计人机对话界面,实现水箱液位串级控制系统设计。要求通过对现场系统数据的采集处理,在组态软件中实现动画显示、报警处理、流程控制、实时曲线和报表输出等功能。同时利用控制系统,在所设计的组态软件监控界面中,进行相关仪表调校和控制器参数整定。最后向用户提供水箱液位串级控制系统的动态运行结果。
关键词:液位串级控制;智能仪表;组态王
Based on configuration of intelligent instrument cascade control system design
Abstract: Process control systems usually refers to the automatic control system of industrial production in the charged amount is the temperature, pressure, flow, level, composition, viscosity, humidity, number of process variables such systems, with continuous automatic control of the production process, the process of testing And control posed of multiple controlled process, the control program of rich features. Cascade control system is to improve the quality control process extremely efficient method, which has been more widely used. With simple control systems, cascade control system only adds a structure within the loop, but it can receive a significant control effect. This is because the cascade control system, due to the role of Vice-loop fast, so cascade control system into the inner loop of the disturbance has a strong capacity to e; the same time due to the presence of Vice-loop to improve the dynamic characteristics of the object, Improve the system frequency, and the system has a certain degree of adaptive capacity. Water tank is a time-varying, large time delay of the controlled object, it is used as a cascade control system to control the object is appropriate. According to the principle of flow control tank level, consideration of various fac