基于Smith预估模糊PID复合控制器的研究

针对空调房间温度被控对象的大滞后大惯性，本文提出一种预估并联型模糊PID复合控制策略。根据偏差大小及时调整模糊和PID控制的比例，利用Smith预估器进行时间补偿控制，同时在模糊控制器上并联一个积分器以消除稳态误差。在模型匹配和失配情况下进行仿真研究，结果表明：该控制器不仅具有鲁棒性好、控制精度高以及响应速度快的特点，尤其在模型失配时具有良好的稳定性，而且对于大时滞系统是一种实用而简便的控制方法。

Study on the Compound Fuzzy-PID Controller Based on Smith Predictor

According to a large dead-time and inertia of the control object of room temperature, a compound fuzzy-PID controller ith smith predictor is designed, which fulfills expediently the proportion adjustment of all parts in a multiple controller, and uses smith predictor for the control of time compensation. Besides an integrator is paralleled on the fuzzy controller to eliminate steady-state error. The simulation of the new control algorithm is studied under the condition of model matching and unmatched model. The simulation shows that the control system with proposed controller not only has a better characteristic of stability,robustness and rapid speed adjustment,especially when system is unmatched model, but also a high controlling accuracy. And it is an appropriate and simple control method for the system with pure time delay.