污水活性污泥处理过程的溶解氧增益调度控制

Gain-Scheduling Control of the Dissolved Oxygen Concentrationin Activated Sludge Wastewater Treatment Processes

摘要:

考察污水活性污泥处理过程溶解氧控制效果的重要性能指标是溶解氧浓度的波动情况和能耗。针对溶解氧的非线性传递模型,本文提出了以溶解氧设定值作为调度变量的溶解氧增益调度控制方法。即在溶解氧设定值进行泰勒级数展开得到线性模型,采用参考模型方法设计控制器,再根据不同的调度值(溶解氧设定值),调度线性时不变控制器。仿真结果表明,本文提出的增益调度控制方法无论在能耗方面还是在控制精度方面都要明显优越于常规的开关控制和PID控制。

Abstract:

Dissolved oxygen (DO) concentration has long been recognized as a important controlled variable in the activated sludge wastewater treatment processes, and the fluctuation of Do concentration around the set-point and accumulated air consumption are taken as important performance parameters. In this paper, gain-scheduling control methods for DO concentration, where set-point value for DO concentration is considered as a scheduled variable, is presented. Simulations show that the presented gain-scheduling control method has obvious advantages over conventional control methods such as On-Off control and PID control in the energy consumption and control precision.