模糊自适应PID控制的双闭环风压调节系统

摘要

针对工业通风系统存在大惯性、时滞、非线性的特点,以及常规PID控制、模糊控制中存在参数不易整定、自适应能力有限的问题,提出了一种转速、压力双闭环调节输出参数的控制策略.该控制系统将串级控制与通风系统相应环节的数学模型相结合,由PID控制器调节内环转速参数,模糊自适应PID控制器调节外环风压参数,保持输出风压的恒定.仿真结果表明,该控制方法具有响应速度快、超调量小、抗干扰能力强的优点,能够显著地提高通风系统的风压精度,节能效果良好.%Aiming at the features of large inertia, time lag and non-linearity in industrial ventilation systems, and the problems existing in conventional PID control and fuzzy control, e. g. , hard to tune parameters and limited self-adaptive capability, the speed and pressure double closed-loop control strategy for regulating output parameters is proposed. In this control system, the cascade control and the corresponding mathematical model of the ventilation system are combined, the inner loop speed parameter is regulated by PID controller; while the outer air pressure parameter is regulated by fuzzy self-adaptive PID controller, thus the output of air pressure is keeping constant. The result of simulation shows that the proposed control method features fast response, small overshooting and strong anti-interference capability, it significantly improves the precision of air pressure and offers better energy saving effect.