(19)
(11) EP 2 916 447 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
06.01.2016 Bulletin 2016/01

(43) Date of publication:
09.09.2015 Bulletin 2015/37

(21) Application number: 14275043.9

(22) Date of filing: 05.03.2014
(51) International Patent Classification (IPC): 
H02M 7/483(2007.01)
 H02M 1/00(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(71) Applicant: ALSTOM Technology Ltd
5400 Baden (CH)

(72) Inventors:
  • Trainer, David Reginald
    Alvaston, Derby DE24 0AQ (GB)
  • Jasim, Omar Fadhel
    Wollaton, Nottingham NG8 2RW (GB)
  • Clare, Jonathan Charles
    Keyworth, Nottingham NG12 5EG (GB)

(74) Representative: Potter Clarkson LLP 
The Belgrave Centre Talbot Street
Nottingham NG1 5GG
Nottingham NG1 5GG (GB)

   


(54) Voltage source converter


(57) A voltage source converter (30) comprises first and second DC terminals (32,34) for connection to a DC network (58). The voltage source converter (30) further includes at least one limb connected between the first and second DC terminals (32,34). The or each limb includes:
a phase element (36) including two parallel-connected sets of series-connected switching elements (40) connected in an H-bridge to define first and second diagonal switching pairs, a respective junction between each set of series-connected switching elements (36) defining an AC terminal (40) for connection to an AC network (50); and
a sub-converter (38,39) configured to be controllable to act as a voltage waveform synthesiser;
wherein the voltage source converter (30) further includes a controller (60) to operate the sub-converter (38,39) to selectively synthesise a driving commutation voltage to modify a DC side current at a DC side of the H-bridge so as to minimise any differences in magnitude and direction between the DC side current and an AC side current at an AC side of the H-bridge and thereby carry out commutation of current from one of the first and second diagonal switching pairs to the other of the first and second diagonal switching pairs.