摘要
除氧器是将溶解在水中的有害气体尤其是水中的溶解氧从水中除去,以免这些有害气体进入锅炉系统造成热力设备腐蚀,从而影响锅炉系统的正常运作,所以除氧器在热力发电厂中起到了很重要的作用。除氧系统具有滞后、时变、非线性等特点,对此常规PID控制器无法获得满意的效果,为了保证除氧器能达到很好的除氧效果,就需要采用先进的控制方法。很多学者研究了如何对除氧器的压力、水位进行控制,以除氧器为被控对象,分析了PID控制和模糊控制的优缺点,将PID控制和模糊控制的优点结合起来,采用模糊规则在线整定PID的kp、ki、kd三个参数的模糊PID技术设计了除氧器的温度控制系统;使用MATLAB软件对PID控制、模糊PID控制分别进行了仿真研究,仿真结果表明参数模糊PID控制能满足调节时间短、超调量小且稳态误差在(104±3)℃内的控制要求。
Deaerator plays an important role in thermodynamic power plants because it can remove the harmful gas,especially oxygen in water.Deaerator system has the characteristic of delay,non-linearization and time-variable,thus normal PID can not achieve desired effect.In order to accomplish the good effect,people design the auto control system of deaerator which based on the advanced control method.Many researchers give the control strategies based on pressure and water level of deaerator system.It is designed based on control PID theory,which involves fuzzy control rules,is employed to make real-time adjustments to the three parameters kp,ki and kd of the PID of the temperature of deaerator here.First,simulations of PID control and fuzzy PID control concerning their respective control quality are done by MATLAB 6.5.Moreover,the simulation results show that its robustness is good,because effective control makes the regulating time short,the overshoot and the steady-error very little.
出处
《机械设计与制造》
北大核心
2011年第2期23-25,共3页
Machinery Design & Manufacture
基金
宝鸡文理学院重点项目资助(ZK1038)
关键词
除氧器
温度控制
模糊PID控制
单片机
Deaerator
Temperature control
Fuzzy PID Control
Micro-controller
