Open AccessHigh‐efficiency topology‐morphing multi‐resonant DC–DC converter with wide voltage gain range for small‐scale wind generation applications
Author(s) -
Han Fuqiang,
Wang Yifeng,
Yang Liang,
Chen Mengying,
Liu Ruixin,
Xu Rong
Publication year - 2019
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/iet-pel.2018.6283
Subject(s) - topology (electrical circuits) , voltage , transformer , high voltage , morphing , electrical engineering , electronic engineering , computer science , engineering , computer vision
In this study, a high‐efficiency topology‐morphing multi‐resonant DC–DC converter is proposed. The converter employs two auxiliary switches to control the equivalent resonant tank, and thus exhibits adaptive resonant characteristics for diverse situations. The dual‐transformer MRC structure is applied when high‐voltage gain is required, while a five‐element MRC operates at the rated state for high‐conversion efficiency. Besides, good protection for the over‐current issue is guaranteed. Also, beneficial from the topology‐morphing technology, the operating frequency range is very narrow and near every mode's high‐efficiency region. Therefore, the proposed converter has an expanded voltage gain range and maintains high‐efficiency throughout. These features make it well suitable for small‐scale wind generation applications. Finally, a 500 W prototype is fabricated in the laboratory to test the performances. The input voltage varies from 80 to 600 V and the output voltage is constant at 400 V. The efficiency remains high (>96.5%) among the entire voltage gain range and the peak value reaches 97.93%.