In wastewater treatment processes, the concentration of dissolved oxygen affects the performance of wastewater treatment directly. It is one of the key factors that determines effluent quality of the wastewater treatment. However, a simple closed-loop control has a high-energy consumption, and it cannot guarantee the effluent quality due to large perturbations in wastewater treatment plants, such as the influent rate, the temperature, and the complex biochemical reactions. In this paper, a new disturbance rejection controller is designed to address those perturbations. Dynamics of dissolved oxygen is transformed into a controllable canonical form. Discrepancy between the dissolved oxygen dynamics and the controllable canonical form is estimated by a disturbance observer and compensated by a control law. Stability and the bound of tracking errors are obtained. Finally, numerical results on the benchmark simulation model number 1 are presented to confirm the proposed method.

中文翻译：

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废水处理过程中溶解氧的扰动抑制控制

在废水处理过程中，溶解氧的浓度直接影响废水处理的性能。它是决定污水处理出水水质的关键因素之一。然而，简单的闭环控制能耗高，并且由于污水处理厂的进水速率、温度、复杂的生化反应等扰动较大，无法保证出水水质。在本文中，设计了一种新的抗扰控制器来解决这些扰动。溶解氧的动力学转变为可控的规范形式。溶解氧动力学与可控规范形式之间的差异由干扰观测器估计并由控制律补偿。获得了稳定性和跟踪误差的界限。最后，给出了基准仿真模型 1 的数值结果以证实所提出的方法。