参数自适应模糊PID控制在中央空调变流量节能中的应用

Application of Parameter Self-Adaptive Fussy PID Control in Central-Condition Saving-energy System

中央空调的耗能问题日益引起人们的关注.由于其系统存在很大程度的非线性、大滞后和参数时变性,因而.采用传统的PID控制有很大的困难.模糊控制的优点是能够得到较好的动态响应特性,并且无需知道被控对象的数学模型,适应性强,上升时间快,鲁棒性好.但模糊控制受模糊规则有限等级的限制易引起误差.设计中采用AT89 C58作为控制内核,结合模糊控制和PID算法的优点,提出参数自适应模糊PID算法,通过实验已证明了该系统的稳定性、快速性及抗干扰能力,能满足变流量控制系统的需要[1].

The problem about energy consumed by central air-conditioner is paid attention by people. There are great non-linearity, lag and variety of parameter in this system. Traditional PID control arithmetic has some difficulty. The merit of fussy-control is that there is better dynamic response characteristic. The mathematic model is not needed in this arithmetic. There is better adaptability, faster rise time and better robust characteristic. But there is error in fussy- control by limited grade. So we use AT89C58 as control kernel and use fussy-PID arithmetic in this system. It ensures that there is faster, more stability and smaller error. This control system has been proved stable by some experiment, the anti-interference ability is strong. It can satisfy completely the need of variable-flux equip.