Application of LADRC with stability region for a hydrotreating back-flushing process

Abstract Control of liquid level is an important factor in diesel catalytic cracking. Because there may be many unexpected situations during operation, we should not only consider the deviation control of the liquid level, but also consider the sudden change of liquid level caused by sudden feeding. Therefore, it is necessary to design a controller to guarantee the stability control effect in both cases. Taking advantages of the dual-locus diagram method, a stability region determination method for linear active disturbance reject controller (LADRC) is proposed to determine the stability region of controller to ease engineering applications. Hence, this theorem is applied to solve the LADRC stabilization problem of 1.2 million tons hydrotreating back-flushing process. Numerical examples and experiment results demonstrate the validity of the proposed method.

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