Department of Electrical Engineering, Universidad de la Frontera, Casilla 54-D, Temuco, Chile.
Water Sci Technol. 2009;60(10):2545-53. doi: 10.2166/wst.2009.516.
This paper presents a sliding mode controller (SMC) for dissolved oxygen (DO) in an integrated nitrogen removal process carried out in a suspended biomass sequencing batch reactor (SBR). The SMC performance was compared against an auto-tuning PI controller with parameters adjusted at the beginning of the batch cycle. A method for cancelling the slow DO sensor dynamics was implemented by using a first order model of the sensor. Tests in a lab-scale reactor showed that the SMC offers a better disturbance rejection capability than the auto-tuning PI controller, furthermore providing reasonable performance in a wide range of operation. Thus, SMC becomes an effective robust nonlinear tool to the DO control in this process, being also simple from a computational point of view, allowing its implementation in devices such as industrial programmable logic controllers (PLCs).
本文提出了一种悬浮生物序批式反应器（SBR）中进行的综合脱氮过程中溶解氧（DO）的滑模控制器（SMC）。将 SMC 的性能与在批处理周期开始时调整参数的自整定 PI 控制器进行了比较。通过使用传感器的一阶模型，实现了一种取消慢速 DO 传感器动态的方法。在实验室规模的反应器中的测试表明，SMC 比自整定 PI 控制器具有更好的抗扰能力，并且在广泛的操作范围内提供了合理的性能。因此，SMC 成为该过程中 DO 控制的有效强大的非线性工具，从计算角度来看也很简单，允许其在诸如工业可编程逻辑控制器（PLC）之类的设备中实现。
