Improved MVDC Breaker Operation by Active Fault Current Sharing (FCS) of Existing Power Converters for Shipboard Applications

作     者：Xie, Ren Li, Hui 

作者机构：Florida State Univ Ctr Adv Power Syst Tallahassee FL 32310 USA 

出 版 物：《IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS》 (IEEE J. Emerg. Sel. Top. Power Electron.)

年 卷 期：2021年第9卷第3期

页      面：2620-2631页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：U.S. Office of Naval Research [N00014-16-1-2956  N00014-16-13191] 

主　　题：Circuit faults Circuit breakers Phase change materials Fault currents Power electronics Switches Equivalent circuits Circuit breakers (CBs) dc-dc power converters hybrid circuit breaker (HCB) medium-voltage dc (MVdc) power distribution faults power electronics shipboard power system (SPS) solid-state circuit breaker (SSCB) 

摘      要：In this article, an active fault current sharing (FCS) strategy is proposed to improve the dc circuit breaker (CB) operation in a breaker-based medium-voltage dc (MVdc) system. The peak turn-off current of CBs can be decreased by controlling the existing converters located in parallel with activated CBs to share the fault current. This reduction effect can be amplified from the systematic perspective since one single converter with the proposed FCS can benefit different CBs in various fault scenarios. The short-circuit fault scenarios of a shipboard breaker-based MVdc system are analyzed and the corresponding fault equivalent circuits, including power converters adjacent to CBs, are developed. The device stress of voltage-fed (VF) and current-fed (CF) converters applying the proposed active FCS strategies during short-circuit faults is derived and compared with those of passively shutdown counterparts. Finally, a downscaled experimental test bed was built to emulate a 6-kV/6-MW MVdc system fault scenarios. The experimental results are provided to verify the proposed FCS.