DocumentCode :
648336
Title :
Choice of AC operating voltage in HV DC/AC/DC system
Author :
Luth, T. ; Merlin, Michael M. C. ; Green, T.C. ; Barker, C.D. ; Hassan, Foyzul ; Critchley, R.W. ; Crookes, R.W. ; Trainer, David ; Dyke, K.
Author_Institution :
Control & Power Res. Group, Imperial Coll. London, London, UK
fYear :
2013
fDate :
21-25 July 2013
Firstpage :
1
Lastpage :
5
Abstract :
Demand for DC/DC conversion in HV applications is expected to rise because of the increasing number of HVDC links using different DC voltage levels. This paper presents a DC/AC/DC system consisting of two VSCs connected through an inductor. The two VSCs are Alternate Arm Converters (AAC). Since the two AACs share the same AC voltage level, they cannot be operated at their respective “sweet-spots” at the same time. This results in an energy drift in the valves which is tackled by additional balancing currents. However, the choice of the AC voltage level remains critical as it determines the required amount of balancing current, the number of devices and the cell topology, influencing greatly the total efficiency and volume of the obtained DC/DC converter. A study on a scale-down converter highlights the trade-offs affecting the AC voltage choice.
Keywords :
AC-DC power convertors; DC-AC power convertors; HVDC power convertors; AAC; AC voltage level; DC-DC conversion; HV DC-AC-DC system; HVDC links; VSC; alternate arm converters; balancing current; cell topology; energy drift; voltage source converters; Capacitance; Capacitors; HVDC transmission; Power conversion; Topology; Valves; DC-DC power converters; HVDC transmission; emerging topologies; multi-level converters;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power and Energy Society General Meeting (PES), 2013 IEEE
Conference_Location :
Vancouver, BC
ISSN :
1944-9925
Type :
conf
DOI :
10.1109/PESMG.2013.6672913
Filename :
6672913
Link To Document :
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