Analysis and design of a series resonant converter with wide operating range and minimized transformer ratings

Dincan, Catalin Gabriel; Kjær, P.C.; Chen, Yu-hsing; Nielsen, Stig-Munk; Bak, Claus Leth

doi:10.23919/epe17ecceeurope.2017.8099407

Cited by 3 publications

(3 citation statements)

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“…1(b). A controlled or uncontrolled rectifier can be employed to convert ac to dc at the LV side [7], [8]. Subsequently a dual active bridge (DAB) is considered in this work to deliver active power from low voltage dc (LVDC) to MVDC.…”

Section: Introductionmentioning

confidence: 99%

“…MFTs provide a much higher power density than line frequency transformers (LFTs) [13], [14]. The removal of bulky LFTs and its substitution by much more compact components is a key advantages of MVDC [2], [7]. Recent contributions show enabling technologies for MVDC grids: i) high power dc-dc converters, based on different device technologies (i.e., IGBTs, IGCTs, SiC MOSFETs), have been validated in controlled environments [10], [15]- [18].…”

Section: Introductionmentioning

confidence: 99%

“…Fig. 2 shows a simplification suitable for the MVDC collection and distribution of the DC wind farm concept analyzed in [2], [7], [8]. The lumped admittance model that groups all the wind turbine generators is defined as Y total G (ω), with Y WT 1 (ω), Y WT 2 (ω) (and so on) defining individual wind turbine systems.…”

Section: Introductionmentioning

confidence: 99%

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Stable and Passive High-Power Dual Active Bridge Converters Interfacing MVDC Grids

Freijedo

Rodriguez-Diaz

Dujić

2018

IEEE Trans. Ind. Electron.

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Abstract-Dual active bridge (DAB) is a topology that is receiving more and more attention as a potential solution to interface dc grids of different voltage levels. From a system level, the implications of DABs on the stability of complex power systems are addressed in this work. Dynamics modeling and stability assessment for a DAB implementation aimed to interface low-voltage energy resources with a medium-voltage dc (MVDC) collection and distribution grid are presented. The DAB admittance is analytically derived and assessed in order to describe its dynamics and anticipate its behavior when integrated in a complex MVDC grid. The model considers the low frequency range, mostly dominated by the controller action, and the high frequency range, described by a non-linear operation. The theoretical analysis is verified by hardware-in-the-loop emulation, with the controller running on a digital signal processor. The proposed implementation is proved to achieve passivity in the whole spectrum, which undoubtedly is a desired feature for a massive power electronics integration in the future MVDC grids.

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Section: Introductionmentioning

confidence: 99%