一种比例因子自调整的模糊预测函数控制

Self-tuning fuzzy predictive functional control strategy for cascade time-delay system

针对由主、副被控对象级联而成的大纯滞后系统,提出一种内回路采用PI控制、外回路采用具有比例因子自调整的模糊增量型预测函数控制策略,它将预测函数控制和具有比例因子自调整的模糊控制进行综合来共同控制由内回路和主被控对象构成的广义被控对象。大量的仿真实验表明:本方法较其他方法控制效果更好,即使在模型严重失配时,本方法仍具有很强的鲁棒性和抗干扰能力。

A control strategy,in which PID controller is adopted in inner-loop and self-tuning fuzzy predictive functional control algorithm is used in outer-loop,is proposed for cascade time-delay system.The internal loop and the main plant constitute generalized control plant which is controlled by the sum of inputs produced respectively by predictive functional controller and self-tuning fuzzy controller.The strategy is applied in main steam temperature of thermal plant.Simulation results show that the proposed strategy has better control performances compared with other control algorithm.