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Soft Switching Over the Entire Line Cycle for a Quadruple Active Bridge DCX in a DC to Three-Phase AC Module: Preprint

Conference ·
OSTI ID:1583089
 [1];  [1];  [2];  [2];  [3];  [2];  [1]
  1. University of Colorado
  2. University of Washington
  3. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
+ Show Author Affiliations
This paper is focused on a dc to 3-phase ac module consisting of a transformer-isolated quadruple active bridge (QAB) dc-dc converter, followed by three full-bridge dc-ac inverters. The QAB outputs provide time-varying power at twice the line frequency, which presents challenges in maintaining zero voltage switching (ZVS) on the secondary side during low-power intervals. It is shown how ZVS can be maintained even at zero power transfer using a relatively small circulating current provided by the magnetizing inductances of the high frequency transformers. The approach is particularly effective in high-voltage applications using SiC MOSFETs, where the reductions in switching losses outweigh conduction losses due to the circulating currents. A detailed analysis is presented to address optimum sizing of the magnetizing inductance and determination of QAB dead-times including nonlinear device capacitance effects. The approach is verified by experimental results on a 600V, 5kW prototype where a 50% reduction in total loss is demonstrated, resulting in 98.4% measured full-load efficiency.
Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S); USDOE National Renewable Energy Laboratory (NREL), Laboratory Directed Research and Development (LDRD) Program
DOE Contract Number:
AC36-08GO28308
OSTI ID:
1583089
Report Number(s):
NREL/CP-5D00-74449
Country of Publication:
United States
Language:
English

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Related Subjects

14 SOLAR ENERGY
24 POWER TRANSMISSION AND DISTRIBUTION
C2
quadruple active bridge
soft switching
zero voltage switching