变风量空调系统的模糊PID控制.doc

毕业设计（论文） 变风量空调系统的模糊PID控制 系 别 自动化工程系 专业名称 自动化 班级学号 5060129 学生姓名 王 猛 指导教师 王宏伟 2010年6月10日 变风量空调系统的模糊PID控制 摘 要 随着智能建筑的快速发展，楼宇自动化系统也逐渐对建筑内的设备进行越来越科学经济、合理的控制和管理，不仅能使大楼的功能、档次提高，而且可以达到高效节能的效果。变风量空调系统就是以其节能、灵活性而优于其它空调系统，逐渐成为空调系统设计的主流。但变风量空调系统是一个复杂的热力系统，所受干扰多，对象的参数易于变化且难以确定。随着计算机科学、控制理论的发展，产生了新的智能控制理论。 本文应用了一种模糊PID控制算法，在控制过程中引入模糊控制机理，通过模糊调节方法，根据系统的动态特性和行为，对PID控制器的参数进行在线调整，解决控制系统的稳定性与获得良好性能的问题，增强系统对不确定性因素的适应性。通过MATLAB环境下进行仿真，说明了在参数变化的情况下，Fuzzy-PID控制器可以达到满意的性能，并可取得一定的节能效果。 关键词：变风量空调系统， PID控制，模糊PID控制  The PID Fuzzy Control of Variable Air Volume Air Conditioning System Author：Wang Meng Tutor：Wang Hongwei Abstract With the rapid development of Intelligent Building(IB), Building Auto mation System (BAS) has come to control and manage the equipment in the building more and more scientifically, economically and rationally.This can not only raise the function and the level of the building, but also save energy. Variable Air Volume (VAV) air conditioning system is superior to other air condition system for its economic and flexible performance and has become the main stays of air conditioning system. But as a complex thermodynamic system, VAVsystem has many disturb ances and is not easy to calculate its parameters. With the development of computer science and control theory,many new intelligent control theories come into being. In order to satisfy the needs to control effectively and save energy efficiently, this paper introduces a Fuzzy –PID control algorithm. Fuzzy control is introduced in the control process, and by using it and according to the dynamic characteristics and behavior of the system, on line adjustment is carried out to the PID control so as to tackle the contradiction between the stability of the control system and gain good performance. Strengthen the adaptability of the system to