Dual Phase Shift Control Based on Backflow Power Optimization

Jinhui ZENG; Yuan HE; Jing LIU; Zongao YI

doi:10.16513/j.cnki.10-1427/tk.2019.02.006

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Distributed Energy ›› 2019, Vol. 4 ›› Issue (2) : 40-46. DOI: 10.16513/j.cnki.10-1427/tk.2019.02.006

Basic Research

Dual Phase Shift Control Based on Backflow Power Optimization

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Abstract

To restrain the problems of high backflow power, high switch stress and low transmission efficiency of isolated bidirectional full-bridge DC-DC converter under traditional single-phase-shift control, a direct power optimization strategy based on dual-phase-shift control is proposed. Firstly, this paper establishes the mathematical model of power transmission under the traditional single-phase and double-phase control modes, and finds the optimal combination of phase-shifting angles by direct power control for different transmission power and voltage regulation ratios. Then, based on the same transmission power, the power transmission and backflow power curves of the two control strategies are established.. Compared with the traditional single-phase control, the optimal control of double-phase-shifting has more advantages in transmission efficiency, and the more power the converter transmits, the more obvious the optimization effect is. Finally, the simulation and analysis results verify the effectiveness of the control strategy. Compared with the traditional single-phase control, this method can not only reduce the backflow power and the current stress of the switch, but also effectively improve the transmission efficiency of the converter.

Key words

full bridge DC-DC converter / dual phase shift / backflow power / optimal control

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Jinhui ZENG , Yuan HE , Jing LIU , et al. Dual Phase Shift Control Based on Backflow Power Optimization[J]. Distributed Energy Resources. 2019, 4(2): 40-46 https://doi.org/10.16513/j.cnki.10-1427/tk.2019.02.006

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