| Title |
A Control Method to Improve Power Conversion Efficiency of Three-level NPC-Based Dual Active Bridge Converter |
| Authors |
Jun-Young Lee ; Hyun-Jun Choi ; Ju-Yong Kim ; Jee-Hoon Jung |
| DOI |
https://doi.org/10.6113/TKPE/2017.22.2.150 |
| Keywords |
Three-level ; Neutral point clamped ; Dual active bridge ; Assymetric switching conduction loss |
| Abstract |
This study proposes a new pulse-width modulation switching pattern for the low conduction loss of a three-level neutral point clamped (NPC)-based dual-active bridge (DAB) converter. The operational principle for a bidirectional power conversion is a phase-shift modulation. The conventional switching method of the three-level NPC-based DAB converter shows a symmetric switching pattern. This method has a disadvantage of high root-mean-square (RMS) value of the coupling inductor current, which leads to high conduction loss. The proposed switching method shows an asymmetrical pattern, which can reduce the RMS value of the inductor current with lower conduction loss than that of the conventional method. The performance of the proposed asymmetrical switching method is theoretically analyzed and practically verified using simulation and experiment. |