Anti-Windup Controller Design for the Ship with the Rudder Saturation

J. Ocean Eng. Technol. 2002;16(4):61-69.

Rudder 엑츄에이터 포화특성을 고려한 Anti-Windup 제어계의 설계

김영복,최명수

부경대학교 공과대학 기계공학부,부경대학교 공과대학 기계공학부

Keywords: Actuator, Nonlinearity, Saturation, System Performance, Anti-Windup

핵심용어: 엑츄에이터, 비선형성, 포화, 시스템 성능, 앤티 와인드업

Abstract

In the actual control systems, there exist many kinds of restrictions or nonlinearities. However, due to the nonlinearities in actuators and sensors, the designed controller may not be applicable in some practical situations. One such nonlinearity is amplitude saturation in actuators. Although sometimes it may be ignored, in other cases failure to consider actuator saturation may severely degrade closed-loop system performance and even lead to instability. On the other hand, limiting the controller gain to avoid saturation sacrifices control effort and may lead to loss of performance. Consequently, in some cases, the actuator saturation must be explicitly taken into account to ensure desired performance. However, in this paper, an anti-windup control system design method is introduced to suppress the windup due to the amplitude saturation of the actuator. The proposed control system has very simple design process and guarantees the good control performance. The validity of the proposed control system will be shown by comparing with the results of a reported paper.