Development of an Antiwindup Technique for a Cascade Control System

Abstract

A cascade control system comprising the primary and secondary controllers suffers from a cascade-type integral windup problem in which the output saturation of the secondary control loop can considerably increase the integral part of the primary control loop. In this paper, we present a new predictive antiwindup technique that can completely eliminate the possibility of secondary controller output saturation, resulting in no cascade-type integral windup phenomenon. The proposed method does not require any type of process models; thus, its implementation is simple and straightforward, which is a very favorable advantage compared to the model-based antiwindup techniques from the practical viewpoint. Our simulation confirms that the proposed method can completely remove the primary controller’s cascade-type integral windup resulting from the saturation of the secondary controller output. Further, the proposed method exhibited good control performance without needing any type of process model for the various types of processes and controllers. Our experimental study successfully demonstrated that there are no problems in applying the proposed method to real plants.

A model-based control strategy for turbo-shaft engine

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“…Predictive control is a popular trend in the current process of control design because of its optimal control calculations which result in lower-energy consumption for thermal processes. One such method successfully tested in a commercial batch reactor facility is intended to solve an integral wind-up problem in cascade controllers via a predictive anti-wind-up approach with two PID controllers . A further predictive PI control strategy reported in the recent literature as “Extended Predictive Control (EPC)” looks promising to provide better tracking efficiency and purity analysis …”