变水量系统Smith-模糊PID复合控制方法
Smith-fuzzy PID compound control strategy for variable volume water system
摘要：
针对集中空调冷水系统存在非线性、滞后性大、时变性强等特点，提出了一种Smith-模糊PID复合控制方法。首先构建了集中空调冷水系统的数学模型；其次分别介绍了模糊PID和Smith预估补偿的原理；最后结合两者优势，提出根据系统状态决定是否应在模糊PID控制的基础上加入Smith预估补偿的复合控制方式。仿真对比表明：采用该控制方式后，系统能够快速达到设定值，动态性能较好，并且抗干扰能力强，即便系统参数发生变化，依然能够保持较好的适应性。将此控制方法应用到实验平台上，实验数据表明，相较于传统PID控制，Smith-模糊PID复合控制具有更好的节能效果。
Abstract：
Aiming at the characteristics of chilled water system in central air conditioning, such as nonlinear, large hysteretic nature and strong time-varying, proposes a Smith-fuzzy PID compound control strategy. Develops a mathematical model of chilled water system in the central air conditioning system. Presents the principles of fuzzy PID and Smith predictive compensation respectively. Combining advantages of two methods, proposes a compound control strategy which adding Smith predictive compensation to fuzzy PID control according to the system state. Simulation results show that the system can quickly reach the set value by this control strategy, with better dynamic performance and anti-interference ability. Even though the parameters vary, the system is still of good adaptability. Applies the control strategy to an experimental platform, and the experimental data shows that compared with traditional PID control, Smith-fuzzy PID compound control strategy is more energy efficient.
Keywords:chilled water system, fuzzy PID control, Smith predictive compensation, compound control, energy saving