Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Improved Conditional Integrator Anti-Windup Method for Seamless Transfer of Bidirectional DC-DC Converter in Grid-Connected Battery Energy Storage System
Authors Jun-Yong Eom ; Sung-Jin Choi ; Hong-Hee Lee
DOI 10.6113/TKPE.2020.25.5.342
Page pp.342-351
ISSN 1229-2214
Keywords Seamless transfer; Mode transition; Anti-windup; Bi-directional converter; DC microgrid system
Abstract Power exchanges between the grid and the battery through a bidirectional DC-DC converter are essential for DC microgrid systems. In general, the battery is charged when the grid is connected, and the system is powered by the battery when the grid is disconnected. In this mode transition, the saturation of the voltage controller slows down output response and produces large transient errors in DC link voltage. To solve this problem, a novel anti-windup design is proposed to improve anti-windup performance further. The proposed method stabilizes DC bus voltage through a wider range of battery voltage with faster transition compared with that of conventional methods. The proposed method is verified through an experimental setup composed of a 125 W laboratory-scale DC microgrid system.