基于线性自抗扰的城市污水脱氮控制仿真

摘要

Based on A/O nitrogen removal process and the kinetic model, Benchmark Simulation Model No.1, two significant factors, nitrate nitrogen and dissolved oxygen, affecting nitrogen removal in wastewater treatment process are considered. Linear active disturbance rejection control (LADRC) is adopted to realize the removal of nitrogen. The control laws designed for nitrate nitrogen and dissolved oxygen do not rely on faithful mathematical models, which make the effluent quality of wastewater be robust enough to uncertainties and fluctuant factors, and nice performance is obtained. Dynamic simulation results show that LADRC has better performance. It can improve the efficiency of nitrogen removal and the effluent quality of wastewater.%根据A/O工艺的脱氮原理，基于城市污水处理的1号基准动力学模型，分析影响脱氮过程的两个重要因素：硝态氮和溶解氧，利用线性自抗扰实现城市污水处理过程的脱氮控制。基于硝态氮和溶解氧分别设计线性自抗扰控制，既避免对复杂数学模型的依赖，又克服影响污水出水水质的波动因素，可获得较好的污水处理效果。动态仿真结果表明，线性自抗扰具有更好的控制性能。基于线性自抗扰的脱氮控制有利于提高污水处理的脱氮效率，改善出水水质。