基于组态的液位串级控制系统设计.docVIP

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 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 instruments composed 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 overcome; 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 factors, control of the system construction of water tanks. Use of smart meters to do this project controller, configuration monitoring software with in