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Disturbance Management in a DC Grid using a Hierarchical Control Structure

Karatsivos, Evripidis LU ; Svensson, Jörgen LU and Samuelsson, Olof LU (2015) Cigré International Symposium
Abstract
DC grids will play a key role in the future, interconnecting generation and load centers as well as energy markets. Large multi-terminal VSC-HVDC systems of high capacity will require automated coordination for several operation scenarios especially when operating under disturbances. With this in mind, and considering the dynamics of a DC system, communication loss events are considered severe disturbances in the operation of the multi-terminal system along with major electrical faults such as 3-phase faults on the AC sides of the converters that require considerable coordination efforts. This work aims at enabling the multi-terminal system with communication loss ride-through and automatic post-fault rescheduling capabilities. This is... (More)
DC grids will play a key role in the future, interconnecting generation and load centers as well as energy markets. Large multi-terminal VSC-HVDC systems of high capacity will require automated coordination for several operation scenarios especially when operating under disturbances. With this in mind, and considering the dynamics of a DC system, communication loss events are considered severe disturbances in the operation of the multi-terminal system along with major electrical faults such as 3-phase faults on the AC sides of the converters that require considerable coordination efforts. This work aims at enabling the multi-terminal system with communication loss ride-through and automatic post-fault rescheduling capabilities. This is achieved within a hierarchical control structure whose features are briefly described. A 3-terminal VSC-HVDC system is modelled for the needs of demonstration under different operation scenarios. Communication loss ride-through capability is demonstrated by comparing the behavior of the 3-terminal system during a normal operation scenario and a worst-case scenario where communications with all-three terminals fail. Its behavior does not change but since communications fail, the operation is uncoordinated greatly reducing the security of the system regarding upcoming events. During 3-phase faults DC droop performs the primary control stabilizing the system. Secondary control is performed by the overall control after the system state is identified. Automatic, post-fault rescheduling takes place in an effort to follow the power flow schedule where possible without exceeding substation limits. (Less)
Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
HVDC Grid, Multi-terminal, Control - Hierarchical, Disturbance
host publication
Lund Symposium 27/28 May, 2015
article number
365
publisher
CIGRE (International Council on Large Electric Systems)
conference name
Cigré International Symposium
conference location
Lund, Sweden
conference dates
2015-05-27 - 2015-05-28
language
English
LU publication?
yes
id
cd3a4d9e-523b-4829-b3a6-92548132976a
alternative location
http://www.malmokongressbyra.se/kongress/download/1517_364.pdf
date added to LUP
2016-06-17 06:20:11
date last changed
2018-11-21 21:24:18
@inproceedings{cd3a4d9e-523b-4829-b3a6-92548132976a,
  abstract     = {{DC grids will play a key role in the future, interconnecting generation and load centers as well as energy markets. Large multi-terminal VSC-HVDC systems of high capacity will require automated coordination for several operation scenarios especially when operating under disturbances. With this in mind, and considering the dynamics of a DC system, communication loss events are considered severe disturbances in the operation of the multi-terminal system along with major electrical faults such as 3-phase faults on the AC sides of the converters that require considerable coordination efforts. This work aims at enabling the multi-terminal system with communication loss ride-through and automatic post-fault rescheduling capabilities. This is achieved within a hierarchical control structure whose features are briefly described. A 3-terminal VSC-HVDC system is modelled for the needs of demonstration under different operation scenarios. Communication loss ride-through capability is demonstrated by comparing the behavior of the 3-terminal system during a normal operation scenario and a worst-case scenario where communications with all-three terminals fail. Its behavior does not change but since communications fail, the operation is uncoordinated greatly reducing the security of the system regarding upcoming events. During 3-phase faults DC droop performs the primary control stabilizing the system. Secondary control is performed by the overall control after the system state is identified. Automatic, post-fault rescheduling takes place in an effort to follow the power flow schedule where possible without exceeding substation limits.}},
  author       = {{Karatsivos, Evripidis and Svensson, Jörgen and Samuelsson, Olof}},
  booktitle    = {{Lund Symposium 27/28 May, 2015}},
  keywords     = {{HVDC Grid; Multi-terminal; Control - Hierarchical; Disturbance}},
  language     = {{eng}},
  publisher    = {{CIGRE (International Council on Large Electric Systems)}},
  title        = {{Disturbance Management in a DC Grid using a Hierarchical Control Structure}},
  url          = {{http://www.malmokongressbyra.se/kongress/download/1517_364.pdf}},
  year         = {{2015}},
}