A Non-Isolated Hybrid-Modular DC-DC Converter for DC Grids: Small-Signal Modeling and Control
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...
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doaj-7fb1351533b442398f8f8440cb10d7c62021-04-05T17:14:50ZengIEEEIEEE Access2169-35362019-01-01713245913247110.1109/ACCESS.2019.29412498836552A Non-Isolated Hybrid-Modular DC-DC Converter for DC Grids: Small-Signal Modeling and ControlAhmed Elserougi0Ibrahim Abdelsalam1Ahmed Massoud2https://orcid.org/0000-0001-9343-469XShehab Ahmed3https://orcid.org/0000-0003-0073-8745Department of Electrical Engineering, Alexandria University, Alexandria, EgyptDepartment of Electrical Engineering, Technology and Maritime Transport, Arab Academy for Science, Cairo, EgyptDepartment of Electrical Engineering, Qatar University, Doha, QatarComputer, Electrical, and Mathematical Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal, Saudi ArabiaThis 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.https://ieeexplore.ieee.org/document/8836552/Converter modelingdc-dc convertersdc gridshybrid-modular converterssmall-signal analysis |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ahmed Elserougi Ibrahim Abdelsalam Ahmed Massoud Shehab Ahmed |
spellingShingle |
Ahmed Elserougi Ibrahim Abdelsalam Ahmed Massoud Shehab Ahmed A Non-Isolated Hybrid-Modular DC-DC Converter for DC Grids: Small-Signal Modeling and Control IEEE Access Converter modeling dc-dc converters dc grids hybrid-modular converters small-signal analysis |
author_facet |
Ahmed Elserougi Ibrahim Abdelsalam Ahmed Massoud Shehab Ahmed |
author_sort |
Ahmed Elserougi |
title |
A Non-Isolated Hybrid-Modular DC-DC Converter for DC Grids: Small-Signal Modeling and Control |
title_short |
A Non-Isolated Hybrid-Modular DC-DC Converter for DC Grids: Small-Signal Modeling and Control |
title_full |
A Non-Isolated Hybrid-Modular DC-DC Converter for DC Grids: Small-Signal Modeling and Control |
title_fullStr |
A Non-Isolated Hybrid-Modular DC-DC Converter for DC Grids: Small-Signal Modeling and Control |
title_full_unstemmed |
A Non-Isolated Hybrid-Modular DC-DC Converter for DC Grids: Small-Signal Modeling and Control |
title_sort |
non-isolated hybrid-modular dc-dc converter for dc grids: small-signal modeling and control |
publisher |
IEEE |
series |
IEEE Access |
issn |
2169-3536 |
publishDate |
2019-01-01 |
description |
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. |
topic |
Converter modeling dc-dc converters dc grids hybrid-modular converters small-signal analysis |
url |
https://ieeexplore.ieee.org/document/8836552/ |
work_keys_str_mv |
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