TY - JOUR
T1 - Minimum-Backflow-Power Scheme of DAB-Based Solid-State Transformer with Extended-Phase-Shift Control
AU - Shi, Haochen
AU - Wen, Huiqing
AU - Chen, Jie
AU - Hu, Yihua
AU - Jiang, Lin
AU - Chen, Guipeng
AU - Ma, Jieming
N1 - Publisher Copyright:
© 1972-2012 IEEE.
PY - 2018/7/1
Y1 - 2018/7/1
N2 - As key component for the flexible dc distributed power system, the dual active bridge (DAB)-converter-based solid-state transformer (SST) with high efficiency for a wide operating range is essential. However, with the traditional phase-shift control, high backflow power and current stress will significantly affect the conversion efficiency. In this paper, the backflow power characteristics in both sides of DAB-based SST converters are comprehensively analyzed. On this basis, complete transmission power, backflow power, and peak current mathematical models are established. Then, a minimum-backflow-power-based extended-phase-shift control strategy is proposed with the determination of optimal phase-shift pairs by using the Karush-Kuhn-Tucker function for various scenarios. The backflow power and current stress curves with different algorithms are compared. It shows the proposed control can improve the output power regulation flexibility, minimize the backflow power, and improve the efficiency in wide operating range. Finally, a DAB-based SST prototype was developed and the experimental results verified the effectiveness of the proposed control strategy.
AB - As key component for the flexible dc distributed power system, the dual active bridge (DAB)-converter-based solid-state transformer (SST) with high efficiency for a wide operating range is essential. However, with the traditional phase-shift control, high backflow power and current stress will significantly affect the conversion efficiency. In this paper, the backflow power characteristics in both sides of DAB-based SST converters are comprehensively analyzed. On this basis, complete transmission power, backflow power, and peak current mathematical models are established. Then, a minimum-backflow-power-based extended-phase-shift control strategy is proposed with the determination of optimal phase-shift pairs by using the Karush-Kuhn-Tucker function for various scenarios. The backflow power and current stress curves with different algorithms are compared. It shows the proposed control can improve the output power regulation flexibility, minimize the backflow power, and improve the efficiency in wide operating range. Finally, a DAB-based SST prototype was developed and the experimental results verified the effectiveness of the proposed control strategy.
KW - Backflow power
KW - bidirectional power flow
KW - efficiency
KW - peak current
KW - phase-shift control
KW - solid-state transformer (SST)
UR - http://www.scopus.com/inward/record.url?scp=85044361068&partnerID=8YFLogxK
U2 - 10.1109/TIA.2018.2819120
DO - 10.1109/TIA.2018.2819120
M3 - Article
AN - SCOPUS:85044361068
SN - 0093-9994
VL - 54
SP - 3483
EP - 3496
JO - IEEE Transactions on Industry Applications
JF - IEEE Transactions on Industry Applications
IS - 4
ER -