TY - JOUR
T1 - Research on Transient DC Bias Analysis and Suppression in EPS DAB DC-DC Converter
AU - Dai, Tianli
AU - Qin, Jinggang
AU - Ge, Gao
AU - Zhou, Chao
AU - He, Lican
AU - Zhai, Jingyu
AU - Li, Jiangang
N1 - Funding Information:
This work was supported in part by the Strategic Priority Research Program of Chinese Academy of Sciences under Grant XDB25000000, in part by the Fund of Natural Science Foundation of China under Grant 51677184, in part by the National Key Research and Development Plan under Grant 2019YFC0117502, and in part by the National High Level Research Project.
Publisher Copyright:
© 2013 IEEE.
PY - 2020
Y1 - 2020
N2 - During excitation and demagnetization phase for the superconducting magnet, in dual-active-bridge (DAB) converter based power supply, a dc bias may occur in high-frequency transformer and thus lead to the faults. In this paper, an improved transient extend-phase-shift (TEPS) control strategy is proposed to suppress the dc bias without any additional hardware. Unlike the traditional extend-phase-shift (EPS) strategy, the voltages of the transformer are asymmetrical for half a period after changing phase-shift and then remain symmetrical. This makes it take half a switching period for the current of transformer to reach the steady state, and then eliminates the dc bias. The experiment verifies the performance on dc bias suppression. This method provides a good theoretical and experimental basis for the EPS DAB DC-DC converter to realize the optimal control for excitation and demagnetization system in high-field superconducting magnet power supply (SMPS).
AB - During excitation and demagnetization phase for the superconducting magnet, in dual-active-bridge (DAB) converter based power supply, a dc bias may occur in high-frequency transformer and thus lead to the faults. In this paper, an improved transient extend-phase-shift (TEPS) control strategy is proposed to suppress the dc bias without any additional hardware. Unlike the traditional extend-phase-shift (EPS) strategy, the voltages of the transformer are asymmetrical for half a period after changing phase-shift and then remain symmetrical. This makes it take half a switching period for the current of transformer to reach the steady state, and then eliminates the dc bias. The experiment verifies the performance on dc bias suppression. This method provides a good theoretical and experimental basis for the EPS DAB DC-DC converter to realize the optimal control for excitation and demagnetization system in high-field superconducting magnet power supply (SMPS).
KW - dc~bias
KW - Dual-active-bridge (DAB)
KW - high-field SMPS
KW - transient extend-phase-shift (TEPS) control strategy
UR - http://www.scopus.com/inward/record.url?scp=85083297915&partnerID=8YFLogxK
U2 - 10.1109/ACCESS.2020.2983090
DO - 10.1109/ACCESS.2020.2983090
M3 - Article
AN - SCOPUS:85083297915
SN - 2169-3536
VL - 8
SP - 61421
EP - 61432
JO - IEEE Access
JF - IEEE Access
M1 - 9046035
ER -