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In this paper, a duty-cycle control (DCC) method for a three-phase dual-active bridge (DAB3) converter with snubber capacitors is proposed to ensure the zero-voltage switching (ZVS) operation over the whole operation range. Closed-form expressions for the proposed modulation scheme are derived. Furthermore, the equivalent circuit and mathematical model of the converter commutation process are presented...
Many publications present the extension of the soft-switching range of the dual-active bridge (DAB). Unfortunately soft-switching over the entire operating area of the DAB is hard to realize. In this paper, the loss reduction of a 5 MW dual-active bridge using the auxilary-resonant commutated pole technique are derived by simulation. The aim of this technique is to improve the converter's efficiency...
DC grid technology is regarded as a promising solution for future electric networks integrating a great amount of renewable energies. It calls for high efficiency dc-dc converters with high step-up ratio to interconnect medium voltage (MV) dc distribution grids and high voltage (HV) dc transmission grids. This paper presents an isolated soft-switching dc-dc converter combining two-level converters...
Electrical energy distribution with dc grids reduces the investment costs of the system and increases the overall efficiency. For interconnecting different dc distribution grids as well as linkage to transmission networks and integration of renewable energy sources, the dual-active bridge (DAB) dc-dc converter system is a promising topology. Modularity and scalability improve production and reduce...
The transmission and distribution of electrical energy with direct current (dc) is a promising alternative to established alternating-current (ac) systems. Higher efficiencies, fewer lossy pulse-width modulated converters and smaller transformers reduce operation and investment costs. Moreover, dc collector grids within wind parks leads to benefits for harvesting electrical energy. In this paper,...
An auxiliary resonant-commutated pole (ARCP) ensures soft switching in the entire operation range of a three-phase dual-active bridge dc-dc converter. This work evaluates the design and the resulting boost in system efficiency for different semiconductor materials and devices. Afterwards, a full-scale medium-voltage prototype of an ARCP is constructed. The subsequent measurements are presented within...
In many low-voltage or high-voltage applications, the electrical energy transmission and distribution is enhanced using direct current (dc) already today. To use the advantages of dc also in medium-voltage applications a highly efficient dc-dc converter is needed that has a power capability of several megawatts. At the E.ON Energy Research Center of the RWTH Aachen University a demonstrator for a...
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