A Non-Isolated Hybrid-Modular DC-DC Converter for DC Grids: Small-Signal Modeling and Control
Author | Elserougi, Ahmed |
Author | Abdelsalam, Ibrahim |
Author | Massoud, Ahmed |
Author | Ahmed, Shehab |
Available date | 2020-08-18T08:34:45Z |
Publication Date | 2019 |
Publication Name | IEEE Access |
Resource | Scopus |
ISSN | 21693536 |
Abstract | This paper presents small-signal modeling, stability analysis, and controller design of a non-isolated bidirectional hybrid-modular DC-DC Converter for DC grid applications. The DC-DC converter can be used to interconnect two different DC voltage levels in a medium-/high-voltage DC grid. Half-bridge Sub-Modules (SMs) and a high-voltage valve are the main components of the converter. The high-voltage valve can be implemented via employing series-connected Insulated-Gate Bipolar Transistors (IGBTs). Operation with zero voltage switching of the involved high-voltage valve is feasible, i.e., there is no concern pertinent to dynamic voltage sharing among the series-connected IGBTs. The power is transferred from one side to another through the involved SMs, where their capacitors are connected in series across the high-voltage side, while they are connected sequentially across the low-voltage side. In this paper, the state-space averaging technique is employed to derive the small-signal model of the presented converter for controller design. Closed-form expression of the duty cycle-to-inductor current transfer function is extracted. Comparison between simulation results of the small-signal model and the detailed circuit model is presented to authenticate the accuracy of the derived small-signal model. Finally, a scaled-down prototype is used to verify the accuracy of the small-signal model. - 2013 IEEE. |
Sponsor | This work was supported by the Qatar National Research Fund (a member of Qatar Foundation) through the National Priorities Research Program (NPRP) Grant under Grant NPRP 9-092-2-045. The statements made herein are solely the responsibility of the authors. |
Language | en |
Publisher | Institute of Electrical and Electronics Engineers Inc. |
Subject | Converter modeling dc grids DC-DC converters hybrid-modular converters small-signal analysis |
Type | Article |
Pagination | 132459-132471 |
Volume Number | 7 |
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Electrical Engineering [2611 items ]