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摘要: 现代化的工业生产很多时候需要对液位进行有效的监控，针对液位控制进行研究具有非常重大的应用价值，尤其是石油行业、冶金行业、化工行业等部门的水箱液位控制。当下水箱的液位给定，扰动出现在上、中水箱时，它们的时间常数均小于下水箱，在下水箱的液位未发生明显变化前，扰动所产生的影响已通过内回路的控制及时地被消除。故本论文选用三回路液位串级控制系统，以实现了水箱的液位串级控制。文章首先针对模型进行了分析，借助试验方法完成了模型搭建，并求得了计算时需要的传递函数。然后针对该系统功能的特点进行分析，借助动态仿真技术将控制系统加入到系统中，对功能进行了有效分析。针对系统最后实现的基本控制结构进行对比分析，验证系统串级控制的效果。43136
毕业论文关键词：液位；串级控制；系统仿真；PID调节器
Based on the three tank circuit level cascade control system design
Abstract：Modern industrial production needs a lot of time to effective monitoring of liquid level, aiming at study level control is of great application value, especially the oil industry, metallurgical industry, chemical industry and other departments of the water tank level control. Disturbance in the water tank of liquid level given, and the water tank, the time constant of them are less than the water tank, the water tank of liquid level did not change significantly before, the impact of disturbance is through the inner loop control in a timely manner has been eliminated. This paper chooses three loop level cascade control system, in order to realize the cascade control of liquid level in the water tank. This paper in view of the model are analyzed, with the help of a test method to complete the model is set up, and obtained the transfer function needed for the calculation. Based on the characteristic of the system function is analyzed, by means of dynamic simulation technology will be added to the system, the control system to function effectively analyzed. In view of the system and realize the basic control structure, this paper compares and analyzes authentication system of cascade control effect.
Keywords：liquid level；cascade control ；system simulation；PID modulator
目录
1绪论 1
1.1过程控制概述 1
1.1.1过程控制的特点 1
1.1.2工业过程控制的发展概况 2
1.1.3过程计算机控制系统 2
1.2液位控制系统概述 3
1.2.1 单回路控制系统概述 4
1.2.2串级控制系统概述及特点分析 4
1.3 软件介绍 5
2被控对象建模 8
2.1 试验法简介 8
2.2 实验步骤介绍 9
2.3 水箱数据采集方法介绍： 9
2.3.1单容水箱数字模型 10
2.3.2双容水箱的数字模型 12
2.3.3三容水箱的数学模型: 14
3 控制系统设计及仿真 16
3.1 控制系统设计 16
3.2 控制算法说明 17
3.3 PID控制器参数整定 19
3.4阶跃响应性能 19
3.5 加入扰动