Research on Transient DC Bias Analysis and Suppression in EPS DAB DC-DC Converter

作者：Tianli Dai, Jinggang Qin, Ge Gao, Chao Zhou, Lican He, Jingyu Zhai, Jiangang Li · 发表于：IEEE Access · 年份：2020 · DOI：10.1109/access.2020.2983090 · 被引用次数：33 · 研究领域：Advanced DC-DC Converters、Multilevel Inverters and Converters、Silicon Carbide Semiconductor Technologies

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).