Self-balanced non-isolated hybrid modular DC-DC converter for medium-voltage DC grids

Ahmed A. Elserougi, Ahmed M. Massoud, Ibrahim Abdelsalam, Shehab Ahmed

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Here, a new bi-directional hybrid modular non-isolated DC-DC converter is proposed where it consists of a boost converter (BC) fed from the high-voltage (HV) side. At the BC output stage, a certain number of half bridge submodules (HBSMs) is connected across the BC switch. During the turn-on period of BC switch, the HB-SMs are connected sequentially to the low-voltage (LV) side, which results in charging/discharging their capacitors from/into the LV side. While, during the turn-off period, the LV side is bypassed and the HB-SMs capacitors are connected in series across the BC output stage, which results in discharging/charging them into/from the HV side. The power flow is controlled in both directions by controlling the duty cycle. The proposed configuration provides self-balancing operation thanks to the sequential connection of HB-SMs capacitors, and it also provides the ability to operate with high conversion ratios. Illustration and analysis of the proposed converter and its closedloop controller are presented. A full design of the values and ratings of the involved components are presented. Simulation study for a 2.5 MW (25 kV/10 kV) DC-DC converter is presented. Finally, experimental results for a downscaled prototype are presented for validation.

Original languageEnglish
Pages (from-to)3626-3636
Number of pages11
JournalIET Generation, Transmission and Distribution
Volume12
Issue number15
DOIs
Publication statusPublished - 28 Aug 2018

Fingerprint

DC-DC converters
Electric potential
Capacitors
Switches
Controllers

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

Self-balanced non-isolated hybrid modular DC-DC converter for medium-voltage DC grids. / Elserougi, Ahmed A.; Massoud, Ahmed M.; Abdelsalam, Ibrahim; Ahmed, Shehab.

In: IET Generation, Transmission and Distribution, Vol. 12, No. 15, 28.08.2018, p. 3626-3636.

Research output: Contribution to journalArticle

Elserougi, Ahmed A. ; Massoud, Ahmed M. ; Abdelsalam, Ibrahim ; Ahmed, Shehab. / Self-balanced non-isolated hybrid modular DC-DC converter for medium-voltage DC grids. In: IET Generation, Transmission and Distribution. 2018 ; Vol. 12, No. 15. pp. 3626-3636.
@article{02bd7275cea14d269d57173cc32239db,
title = "Self-balanced non-isolated hybrid modular DC-DC converter for medium-voltage DC grids",
abstract = "Here, a new bi-directional hybrid modular non-isolated DC-DC converter is proposed where it consists of a boost converter (BC) fed from the high-voltage (HV) side. At the BC output stage, a certain number of half bridge submodules (HBSMs) is connected across the BC switch. During the turn-on period of BC switch, the HB-SMs are connected sequentially to the low-voltage (LV) side, which results in charging/discharging their capacitors from/into the LV side. While, during the turn-off period, the LV side is bypassed and the HB-SMs capacitors are connected in series across the BC output stage, which results in discharging/charging them into/from the HV side. The power flow is controlled in both directions by controlling the duty cycle. The proposed configuration provides self-balancing operation thanks to the sequential connection of HB-SMs capacitors, and it also provides the ability to operate with high conversion ratios. Illustration and analysis of the proposed converter and its closedloop controller are presented. A full design of the values and ratings of the involved components are presented. Simulation study for a 2.5 MW (25 kV/10 kV) DC-DC converter is presented. Finally, experimental results for a downscaled prototype are presented for validation.",
author = "Elserougi, {Ahmed A.} and Massoud, {Ahmed M.} and Ibrahim Abdelsalam and Shehab Ahmed",
year = "2018",
month = "8",
day = "28",
doi = "10.1049/iet-gtd.2017.1813",
language = "English",
volume = "12",
pages = "3626--3636",
journal = "IET Generation, Transmission and Distribution",
issn = "1751-8687",
publisher = "Institution of Engineering and Technology",
number = "15",

}

TY - JOUR

T1 - Self-balanced non-isolated hybrid modular DC-DC converter for medium-voltage DC grids

AU - Elserougi, Ahmed A.

AU - Massoud, Ahmed M.

AU - Abdelsalam, Ibrahim

AU - Ahmed, Shehab

PY - 2018/8/28

Y1 - 2018/8/28

N2 - Here, a new bi-directional hybrid modular non-isolated DC-DC converter is proposed where it consists of a boost converter (BC) fed from the high-voltage (HV) side. At the BC output stage, a certain number of half bridge submodules (HBSMs) is connected across the BC switch. During the turn-on period of BC switch, the HB-SMs are connected sequentially to the low-voltage (LV) side, which results in charging/discharging their capacitors from/into the LV side. While, during the turn-off period, the LV side is bypassed and the HB-SMs capacitors are connected in series across the BC output stage, which results in discharging/charging them into/from the HV side. The power flow is controlled in both directions by controlling the duty cycle. The proposed configuration provides self-balancing operation thanks to the sequential connection of HB-SMs capacitors, and it also provides the ability to operate with high conversion ratios. Illustration and analysis of the proposed converter and its closedloop controller are presented. A full design of the values and ratings of the involved components are presented. Simulation study for a 2.5 MW (25 kV/10 kV) DC-DC converter is presented. Finally, experimental results for a downscaled prototype are presented for validation.

AB - Here, a new bi-directional hybrid modular non-isolated DC-DC converter is proposed where it consists of a boost converter (BC) fed from the high-voltage (HV) side. At the BC output stage, a certain number of half bridge submodules (HBSMs) is connected across the BC switch. During the turn-on period of BC switch, the HB-SMs are connected sequentially to the low-voltage (LV) side, which results in charging/discharging their capacitors from/into the LV side. While, during the turn-off period, the LV side is bypassed and the HB-SMs capacitors are connected in series across the BC output stage, which results in discharging/charging them into/from the HV side. The power flow is controlled in both directions by controlling the duty cycle. The proposed configuration provides self-balancing operation thanks to the sequential connection of HB-SMs capacitors, and it also provides the ability to operate with high conversion ratios. Illustration and analysis of the proposed converter and its closedloop controller are presented. A full design of the values and ratings of the involved components are presented. Simulation study for a 2.5 MW (25 kV/10 kV) DC-DC converter is presented. Finally, experimental results for a downscaled prototype are presented for validation.

UR - http://www.scopus.com/inward/record.url?scp=85051680728&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85051680728&partnerID=8YFLogxK

U2 - 10.1049/iet-gtd.2017.1813

DO - 10.1049/iet-gtd.2017.1813

M3 - Article

AN - SCOPUS:85051680728

VL - 12

SP - 3626

EP - 3636

JO - IET Generation, Transmission and Distribution

JF - IET Generation, Transmission and Distribution

SN - 1751-8687

IS - 15

ER -