Development of Anti-windup PI Control and Bumpless Control Transfer Methodology for Feedwater Control System

Abstract

Abstract The windup phenomenon happens when the proportional-integral (PI) algorithm output is saturated. This phenomenon results in deteriorated performance, even instability, in a control system. Additionally, because control systems such as the feedwater control system (FWCS), are dynamic, it is vital to ensure that the state of the system is correct when switching the controller between manual mode and automatic mode. Therefore, the objective of this paper is to present an anti-windup scheme, and a bumpless transfer technique for the PI controller of the FWCS. The anti-windup scheme is developed using the back-calculation method, and the bumpless control transfer methodology is illustrated using a tracking mode of the PI controller at 100% reactor power level. In order to verify these designs, four scenarios are proposed: (1) performance without using an anti-windup scheme, (2) configuration of the block for anti-windup by the back-calculation approach, (3) control transfer with bumps, (4) bumpless control transfer through the use of tracking mode. Then, these scenarios are simulated in MATLAB Simulink. Throughout this simulation, the improved speed responses are obtained when the proposed methods are applied.