Title :
Comparison of non-resonant and super-resonant dual-active ZVS-operated high-power DC-DC converters
Author :
Lenke, Robert ; Mura, Florian ; De Doncker, Rik W.
Author_Institution :
Inst. for Power Generation & Storage Syst., RWTH Aachen Univ., Aachen, Germany
Abstract :
Two bi-directional high-power dc-dc converter topologies with zero-voltage-switching (ZVS) operation over a defined load range are compared. These are the non-resonant dual-active bridge (DAB) and the dual-active series-resonant converter (DSRC) in super-resonant mode. A unified mathematical model describing both converters is presented, which treats the DAB as a boundary case of the super-resonant DSRC with infinite capacitance. It bases on a modification of the analytical analysis of the DSRC presented in. Using the model, a method is developed to optimize the ac link transformer size for a limited dynamic voltage operating range with constant power capability, suitable for high-power converters in utility applications. The influence of the resonant capacitor on transformer size and other vital converter characteristics is quantitatively evaluated.
Keywords :
DC-DC power convertors; power capacitors; resonant power convertors; zero voltage switching; ac link transformer size; dual-active bridge converter; high power DC-DC converters; nonresonant dual-active ZVS; resonant capacitor; super-resonant dual-active ZVS; zero-voltage-switching; Bidirectional control; Bridge circuits; Capacitance; DC-DC power converters; Dynamic range; Mathematical model; Optimization methods; Resonance; Topology; Zero voltage switching; HVDC; High Voltage power converters; Resonant converter; Soft switching; ZVS converters;
Conference_Titel :
Power Electronics and Applications, 2009. EPE '09. 13th European Conference on
Conference_Location :
Barcelona
Print_ISBN :
978-1-4244-4432-8
Electronic_ISBN :
978-90-75815-13-9
