锅炉水位模糊PID控制系统的设计毕业论文.doc

锅炉水位模糊PID控制系统的设计毕业论文 摘 要 锅炉的建模与控制问题一直是人们关注的焦点，而汽包水位是工锅炉安全、稳定运行的重要指标，保证水位控制在给定范围内，对于高蒸汽品质、减少设备损耗和运行损耗、确保整个网络安全运行具有要意义。 传统的锅炉水位三冲量控制系统大都采用PID控制，其控制效果还可以进一步提高。而模糊控制不要求知道被控对象的精确数学模型，只需要操作人员的经验知识及操作数据，鲁棒性强，非常适合用于非线性、滞后系统的控制。 基于锅炉水位控制及模糊控制的特点，本文将PID控制与模糊控制结合,取长补短，构成模糊自整定PID控制系统,作了以下一些试探性工作,对现有的模糊控制器的构成方式进行归纳总结。对汽包水位的模糊控制方式进行结构及性能上的分析和比较，并利用 MATLAB对控制系统进行仿真。结果表明，该控制器自整定能力及鲁棒性比传统PID控制器更强，响应速度快、精度高，同时对虚假水位有较好的控制效果。 关键词：锅炉汽包水位，PID控制，模糊PID控制，MATLAB仿真 Design of Fuzzy PID Control System for Boiler Water Level ABSTRACT The modeling and control problems of boiler is always the focus of attention and drum water level is secure and stable operation of the boiler work, guarantees the important index of water control in a given range, high quality steam for loss and operation, reducing equipment, insure the whole network security is to run. The traditional three-impulse boiler water level control system mostly using PID control, the control effect can be further improved.The fuzzy control is not required to know the exact mathematical model of controlled object, only the knowledge and experience of the operator to manipulate the data, robust, well suited for nonlinear delay systems control. Based on water level control and fuzzy control, this paper will combine PID control and fuzzy control, learn from each other to form fuzzy self-tuning PID control system, made the following tentative work on the composition of the existing methods of fuzzy controller is summarized.Fuzzy control of drum level approach to the structure and performance analysis and comparison, the control system using MATLAB simulation.The results show that the controller self-tuning capability and robustness more than the traditional PID controller, fast response, high accuracy, while the water level had better control of false results. KEY WORDS: boiler drum water level ，PID control ，fuzzy PID control ，MATLAB simulation 目　录 前　言 1 第1章 绪论 2 1.1锅炉控制系统分类 1.2锅炉汽包水位的控制 1.2.1锅炉汽包水位的特性 2 1.2.2控制方法的分类 5 第2章 常规P