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  4. Selection of DC voltage controlling station in an HVDC grid
 
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Selection of DC voltage controlling station in an HVDC grid

Publikationstyp
Journal Article
Date Issued
2017-03-01
Sprache
English
Author(s)
Babazadeh, Davood  orcid-logo
Muthukrishnan, Arvind  
Mitra, Pinaki  
Larsson, Tomas  
Nordström, Lars  
TORE-URI
http://hdl.handle.net/11420/8910
Journal
Electric power systems research  
Volume
144
Start Page
224
End Page
232
Citation
Electric Power Systems Research 144: 224-232 (2017-03-01)
Publisher DOI
10.1016/j.epsr.2016.12.008
Scopus ID
2-s2.0-85006978465
This paper proposes a real-time quantitative evaluation of HVDC converters’ in an HVDC grid to select the suitable DC slack converter. This real-time evaluation considers the strength of connecting AC grid and the converter's on-line capacity margin as selection metrics. The strength of AC grid is evaluated in real-time by the estimation of grid short circuit capacity using recursive lease square algorithm. Given these selection metrics, the credibility of HVDC stations in controlling the DC voltage can be offered to the system operator in real-time for further operational decisions. This paper also studies the practical aspect of the estimation algorithm regarding selection of the operating points. As major contribution, it suggests to intelligently use a naturally occurring droop response in HVDC grids as a second operating point in the estimation algorithm to calculate the short circuit capacity. The method has been tested through set of scenarios using a real-time co-simulation platform. This platform includes real-time power system simulator to model AC/DC grid, industrial HVDC controllers and corresponding ICT systems. The results show that the proper selection of DC slack station can improve the AC system response and DC voltage drops during disturbances.
Subjects
HVDC grid
Short circuit capacity
Slack bus selection
Voltage control
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