Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title A Study on the 3-phase 13.2 kV Solid State Transformer for the DC Distribution
Authors 정동근(Dong-Keun Jeong) ; 윤혁진(Hyeok-Jin Yun) ; 박시호(Si-Ho Park) ; 김호성(Ho-Sung Kim) ; 김명호(Myoung-Ho Kim) ; 류명효(Myung-Hyo Ryu) ; 백주원(Ju-Won Baek)
DOI https://doi.org/10.6113/TKPE.2021.26.5.315
Page pp.315-324
ISSN 1229-2214
Keywords DC distribution; SST (Solid State Transformer); Zero sequence voltage; QAB (Quard Active Bridge); HFIT (High Frequency Isolation Transformer)
Abstract A solid state transformer (SST) that can interface an MVAC of three-phase 13.2 kV and a 1.5 kV DC distribution. SST consists of an AC/DC converter and a DC/DC converter with a high-frequency isolation transformer (HFIT). The AC/DC converter consists of cascaded NPC full-bridge to cope with the MVAC. The DC/DC converter applies a quad active bridge (QAB) topology to reduce the number of the HFIT. Topology analysis and controller design for this specific structure are discussed. In addition, the insulation of HFIT used in DC/DC converters is considered. The discussion is validated using a 300 kVA three-phase SST prototype.