中央空调变流量水系统的控制研究

Self-Setting Fuzzy PID Control of Variable Flow Water System in Central Air-Conditioning

在中央空调水流量优化控制的研究中,针对中央空调水系统具有非线性、大滞后等特性。为了提高空调的控制效果,设计了自整定模糊PID控制器。利用模糊控制对PID控制参数进行整定,满足不同时刻水系统对PID控制参数的要求。仿真结果表明,改进后的PID控制在超调量、调节时间、抗干扰能力等性能指标上较之传统PID控制都有明显优势,大幅度改善了空调系统的性能。同时在系统模型发生变化,PID参数初始值不变时,产生的震荡和超调量变化都小于PID控制,为优化水流量控制提供了参考。

Nonlinearity and large time delay always exist in the water system of central air - conditioning. In order to improve the control effect of the air conditioner, a self - setting fuzzy PID controller is presented. Fuzzy control can set the PID parameters to meet different system requirements. Simulation results show that, compared to the tradition- al PID control, the proposed self- setting fuzzy PID control can greatly improve the performance of the system. At the same time, when the system model changes and the initial values of PID parameters do not change, the concus- sion and overshoot of the system with the self - setting fuzzy PID control are less than that with the traditional PID control.