Case Study of Non-Isolated MMC DC-DC Converter in HVDC Grids

D. Jovcic, P. Dworakowski, G. Kish, A. Jamshidi Far, A. Nami Abb, A. Darbandi, X. Guillaud

Research output: Contribution to conferencePaper

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Abstract

DC-DC converters are expected to play a significant role in future DC transmission grids and in providing connection points to HVDC lines. They will facilitate power exchange between two DC systems of different or similar voltage levels, and they may also provide other functions like DC fault isolation and power flow control.

CIGRE has recently established working group B4.76 which is focused on DC-DC converters and this submission provides initial B4.76 recommendation for non-isolated DC-DC converter topology.

This article presents the topology for non-isolated MMC-based DC-DC converter. The initial design study illustrates that such DC/DC converter will have overall semiconductor count comparable to a MMC AC-DC (used with HVDC transmission) converter of similar rating. A full controller schematic is presented and operating principles are discussed.

A 600MW, 320kV/250kV test system with parameters is presented in detail. A model for this converter is developed in PSCAD and a range of responses are presented. The simulation results confirm good responses for full power reversal, for severe DC faults on each DC bus, and for a step change on DC terminal voltage.

It is concluded that this converter is a good candidate for applications in future DC grids, and the test system is suitable for power flow, stability and protection studies of DC grids.
Original languageEnglish
Publication statusPublished - 7 Jun 2019
EventCIGRE Symposium 2019 - Aalborg, Denmark
Duration: 4 Jun 20197 Jun 2019

Conference

ConferenceCIGRE Symposium 2019
CountryDenmark
CityAalborg
Period4/06/197/06/19

Fingerprint

DC-DC converters
Topology
Schematic diagrams
Electric potential
Flow control
Power control
Semiconductor materials
Controllers

Keywords

  • DC/DC converters
  • DC Transmission Grids
  • HVDC

Cite this

Jovcic, D., Dworakowski, P., Kish, G., Jamshidi Far, A., Nami Abb, A., Darbandi, A., & Guillaud, X. (2019). Case Study of Non-Isolated MMC DC-DC Converter in HVDC Grids. Paper presented at CIGRE Symposium 2019, Aalborg, Denmark.

Case Study of Non-Isolated MMC DC-DC Converter in HVDC Grids. / Jovcic, D.; Dworakowski, P.; Kish, G.; Jamshidi Far, A.; Nami Abb, A.; Darbandi, A.; Guillaud, X.

2019. Paper presented at CIGRE Symposium 2019, Aalborg, Denmark.

Research output: Contribution to conferencePaper

Jovcic, D, Dworakowski, P, Kish, G, Jamshidi Far, A, Nami Abb, A, Darbandi, A & Guillaud, X 2019, 'Case Study of Non-Isolated MMC DC-DC Converter in HVDC Grids' Paper presented at CIGRE Symposium 2019, Aalborg, Denmark, 4/06/19 - 7/06/19, .
Jovcic D, Dworakowski P, Kish G, Jamshidi Far A, Nami Abb A, Darbandi A et al. Case Study of Non-Isolated MMC DC-DC Converter in HVDC Grids. 2019. Paper presented at CIGRE Symposium 2019, Aalborg, Denmark.
Jovcic, D. ; Dworakowski, P. ; Kish, G. ; Jamshidi Far, A. ; Nami Abb, A. ; Darbandi, A. ; Guillaud, X. / Case Study of Non-Isolated MMC DC-DC Converter in HVDC Grids. Paper presented at CIGRE Symposium 2019, Aalborg, Denmark.
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AB - DC-DC converters are expected to play a significant role in future DC transmission grids and in providing connection points to HVDC lines. They will facilitate power exchange between two DC systems of different or similar voltage levels, and they may also provide other functions like DC fault isolation and power flow control.CIGRE has recently established working group B4.76 which is focused on DC-DC converters and this submission provides initial B4.76 recommendation for non-isolated DC-DC converter topology.This article presents the topology for non-isolated MMC-based DC-DC converter. The initial design study illustrates that such DC/DC converter will have overall semiconductor count comparable to a MMC AC-DC (used with HVDC transmission) converter of similar rating. A full controller schematic is presented and operating principles are discussed.A 600MW, 320kV/250kV test system with parameters is presented in detail. A model for this converter is developed in PSCAD and a range of responses are presented. The simulation results confirm good responses for full power reversal, for severe DC faults on each DC bus, and for a step change on DC terminal voltage.It is concluded that this converter is a good candidate for applications in future DC grids, and the test system is suitable for power flow, stability and protection studies of DC grids.

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