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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 In Lund Symposium 27/28 May, 2015
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)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
HVDC Grid, Multi-terminal, Control - Hierarchical, Disturbance
in
Lund Symposium 27/28 May, 2015
publisher
CIGRE (International Council on Large Electric Systems)
conference name
Cigré International Symposium
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
2016-06-20 11:11:29
@misc{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},
  keyword      = {HVDC Grid,Multi-terminal,Control - Hierarchical,Disturbance},
  language     = {eng},
  publisher    = {ARRAY(0xa35f178)},
  series       = {Lund Symposium 27/28 May, 2015},
  title        = {Disturbance Management in a DC Grid using a Hierarchical Control Structure},
  year         = {2015},
}