生物流化床氨氮废水处理过程自抗扰控制系统研究

内循环三相生物流化床氨氮废水处理过程的时间常数长达1 800 s,并有不确定性,是一类生化机理复杂、难以取得好的控制效果的对象.以该过程的主导数学模型为基础,用仿真方法研究自抗扰控制,以达到在有外扰和内扰时,出水氨氮浓度稳定达标和节能的目的.对控制器进行限幅,并整定一阶自抗扰控制器的各参数,获得给定阶跃和扰动阶跃输入下稳态误差为零、无超调,调整时间小于等于2 000 s的性能,对内扰和外扰都有较强的鲁棒性.自抗扰控制器的这一特性能克服被控对象模型不精确或不确定问题,从而可工程应用于生物流化床氨氮废水处理过程.

RESEARCH ON ACTIVE-DISTURBANCE REJECTION CONTROL APPLICATION IN BIO-FLUIDIZED BED AMMONIA-NITROGEN WASTEWATER TREATMENT PROCESS

The ammonia-nitrogen wastewater treatment process with internal circulation three-phase bio-fluidized bed has big inertia of 1800s and uncertainties.It is a kind of object with complex biological and chemical action and hard to obtain nice characteristics.Take the brief mathematical model to represent the process,study Active-disturbance Rejection Control scheme by simulation to keep ammonia-nitrogen concentration of water out stable and meet the boundary,and save energy by avoiding over-aeration when the outside or internal disturbance exists.Set the output limiter of ADRC and tune parameters of it.It turns out that the system has zero static error and zero overshoot with settling time less than or equal to 2000s when the reference and disturbance input are step.It also shows ADRC has stronger robustness.The performance could overcome the inaccuracy and uncertainty of the object model,thus one-order ADRC is applicable to the ammonia-nitrogen wastewater treatment process with ITFB.