基于活性污泥法的污水处理线性自抗扰控制

Linear Active Disturbance Rejection Control for Activated Sludge Waste-Water Treatment Processes

研究污水处理控制问题,以提高污水净化的控制精度。污水的入水水质成分复杂,且存在多种耦合干扰,传统控制方法效果不佳。为提高污水处理效果,设计线性自抗扰控制器以达到主动抵抗外部干扰、提高溶解氧浓度控制效果的目的。通过标称状态及干扰存在时的数值仿真,发现线性自抗扰控制能够有效估计和补偿各种不确定因素,通过系统输出与设定值之间的偏差即可获得良好的溶解氧浓度控制效果。数值仿真结果表明,线性自抗扰控制参数整定简单易行、具有良好的抗干扰性能,为污水处理优化控制提供了一种实际的解决方案。

Aimed at the improvement of the control performance of the wastewater treatment, the process control of wastewater treatment was considered in this paper. Composition of the influent wastewater is complex, and multi - disturbance also exists, which degrades the performance of the closed - loop system if we still employ traditional con- trol approaches. In order to improve the performance of the wastewater treatment, linear active disturbance rejection control （LADRC） was utilized to reject the disturbances actively and improve the control performance of the concen- tration of the dissolved oxygen. Both of the no disturbance and disturbance existing cases were considered in the sim- ulations, the results show that LADRC is able to estimate and compensate the uncertainties in real time. Based on the deviation between the expected and real outputs of the process, the control objects were achieved. LADRC is capable of estimating and compensating disturbance well and its tuning is also easy, both of which make LADRC be a more effective and practical approach in the process control of wastewater treatment.