模糊控制在锅炉除氧系统中的应用  

Design of Boiler Deaerator System Based on Fuzzy Theory

作　　者：周妮娜[1] 雷金莉[2] 张洪才[1] 程咏梅[1] 

机构地区：[1]西北工业大学自动控制学院,陕西西安710072 [2]宝鸡文理学院电子电气工程系,陕西宝鸡721007

出　　处：《计算机仿真》2008年第3期171-174,共4页Computer Simulation

基　　金：国家自然基金(60372085)

摘　　要：锅炉给水中的溶解氧是造成热力设备腐蚀的主要原因之一,氧腐蚀是锅炉安全运行的一大隐患。常用的除氧方法是热力除氧,为保证除氧效果,必须保证除氧器温度和压力的恒定,而除氧系统具有多输入多输出、大滞后、时变性、非线性等一系列特点,除氧器的温度和压力相互影响,是一种强耦合系统,其精确数学模型难以建立,常规的基于PID算法的控制器很难保证运行指标,因此需采用智能化控制方法。针对某发电厂锅炉除氧系统的特点,采用模糊控制理论对除氧器温度进行控制,使锅炉压力满足要求,确定模糊控制器的最佳参数,利用单片机C8051F040开发系统完成系统调试,结合MATLAB仿真模块对设计的系统进行仿真,仿真曲线图表明,模糊控制缩短了系统调节时间,系统超调量减小,优于传统的PID控制,提高了系统性能,有工程应用价值。The oxygen in the boiler feed water is the main reason of device corrosion. The common deoxidization method is heating power deoxidization. The temperature and pressure must be kept steady to get rid of oxygen in water. The deoxidation system with a nonlinear structure is characterized by multi - input multi - output （MIMO） and great time delay. Its temperature and pressure are strongly coupled. For these reasons, it is hard to establish its precise mathematical model. But these requirements are almost unreachable when the ordinary PID control scheme is applied, so an intelligent method is required. This paper presents a method of design based on the fuzzy control theory. At the same time ,an embedded system with the core of Micro - controller is designed and simulation of control system is also performed to study the performance of fuzzy control by MATLAB. Simulation result of fuzzy controller reduces the settling time and damping ratio and it also shows a very brilliant performance compared to PID controller, and improves the characteristic of the system. It is suitable for application in engineering projects.

关 键 词：除氧系统 模糊控制 单片机 仿真 

分 类 号：TP273.4[自动化与计算机技术—检测技术与自动化装置]