Part-I - Controller General of Patents Designs and Trademarks

(12) PATENT APPLICATION PUBLICATION (21) Application No.1824/CHE/2011 A
(19) INDIA
(22) Date of filing of Application :30/05/2011 (43) Publication Date : 21/06/2013
(54) Title of the invention : VOLTAGE SOURCE CONVERTER FOR A HVDC TRANSMISSION SYSTEM
(51) International classification :H02M
(31) Priority Document No :NA
(32) Priority Date :NA
(33) Name of priority country :NA
(86) International Application No
:NA
Filing Date
:NA
(87) International Publication No : NA
(61) Patent of Addition to Application Number :NA
Filing Date
:NA
(62) Divisional to Application Number
:NA
Filing Date
:NA
(71)Name of Applicant :
1)ABB TECHNOLOGY LTD.
Address of Applicant :AFFOLTERNSTRASSE 44, CH-
8050 ZURICH Switzerland
(72)Name of Inventor :
1)PRAVEEN BARUPATI
2)SUBRAMANIAN SASITHARAN
3)SUBHASISH MUKHERJEE
4)TOMAS U JONSSON
(57) Abstract :
The invention concerns a voltage source converter comprising a plurality of switching elements to effectively convert between AC
and DC for a high voltage direct current (HVDC) system. The voltage source converter has a bridge (42) having one or more
phase legs comprising of switching elements (44) connected between a first DC terminal (52) and a second DC terminal (54), in
which each phase leg from the said one or more phase legs comprises an AC terminal provisioned at corresponding midpoint (A,
B, C) of said each phase leg to connect with a AC equipment (50). The voltage source converter also has at least one converter leg
(48) comprising of switching elements connected between the first and the second DC terminals, in which the said at least one
converter leg has a mid point; and has at least one switching element (46) from the plurality of the switching elements, provided
between the midpoint of the said at least one converter leg and the mid points of the each of the phase legs. The method of
operation of the voltage source converter is also provided in the invention. .
No. of Pages : 21 No. of Claims : 18
The Patent Office Journal 21/06/2013 13933