Open AccessA hybrid redundancy scheme for medium‐voltage three‐phase cascaded H‐bridge electronic power transformer
Author(s) -
Wang Dan,
Guan Zhitao,
Tian Jie,
Mao Chengxiong,
Yang Yun,
Wang Zhaoyuan
Publication year - 2022
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/pel2.12272
Subject(s) - redundancy (engineering) , transformer , voltage , topology (electrical circuits) , electronic engineering , computer science , h bridge , electrical engineering , power loss , engineering , reliability engineering , pulse width modulation
Abstract A hybrid redundancy (HR) scheme is proposed for the medium‐voltage three‐phase cascaded H‐bridge electronic power transformer (CHB‐EPT) based on the combination of the global redundant power modules and local redundant power modules. A “HOT‐FIRST‐LOCAL‐FIRST” transition strategy is designed to achieve a short transition time. Furthermore, to reduce the power loss of the redundant power modules, an intermittent charging (IC) strategy is proposed for the hot‐reserved redundant power modules. The detailed analysis of the topology shows that the proposed scheme can achieve low cost, high reliability, low power loss, and good transition performance. The performances are verified by simulations and experimental results.