US 12,244,150 B2
Electric power supply apparatus for a high-power user device
Antonello Mordeglia, Bangkok (TH); and Roberto Molteni, Tradate (IT)
Assigned to DANIELI AUTOMATION S.P.A., Buttrio (IT)
Appl. No. 17/799,919
Filed by DANIELI AUTOMATION S.P.A., Buttrio (IT)
PCT Filed Feb. 11, 2021, PCT No. PCT/IT2021/050032
§ 371(c)(1), (2) Date Aug. 15, 2022,
PCT Pub. No. WO2021/161355, PCT Pub. Date Aug. 19, 2021.
Claims priority of application No. 102020000002959 (IT), filed on Feb. 14, 2020.
Prior Publication US 2023/0062705 A1, Mar. 2, 2023
Int. Cl. H02J 3/36 (2006.01); H02M 7/757 (2006.01); H02M 7/48 (2007.01); H02M 7/493 (2007.01)
CPC H02J 3/36 (2013.01) [H02M 7/7575 (2013.01); H02M 7/48 (2013.01); H02M 7/493 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An electric power supply apparatus for an electric furnace for steel industry applications, comprising:
means for connection to an electricity grid for supplying a mains voltage and a mains current,
at least one electric line for the connection between said means for connection to the electricity grid and said electric furnace, and
a power supply system able to power said electric furnace with alternating current and connected between said electricity grid and said electric furnace, wherein said power supply system comprises a plurality of power supply modules connected in parallel to each other, to the electricity grid, and to the electric furnace, each of the power supply modules comprising a first part configured to transform the electrical energy in alternating current supplied by the electricity grid into electrical energy in direct current, the first part comprising at least one transformer provided with at least one transformer primary connected to at least one transformer secondary, and at least one rectifier connected to the transformer secondary, and a second part configured to transform the electrical energy in direct current into electrical energy in alternating current, the second part comprising at least one converter connected to said at least one rectifier,
wherein said first part and said second part of each power supply module are physically distanced from each other and connected to each other by an intermediate circuit in direct current connected between said at least one rectifier and said at least one converter, said intermediate circuit comprising one or more segments of line made with a superconductor cable, and
wherein said electricity grid is of the three-phase type and each of the power supply modules is provided with a transformer secondary, a rectifier and a converter for each phase of said electricity grid; and
further wherein each power supply module comprises an inductor connected to said at least one converter and located upstream of the electric furnace, said converter and said electric furnace being connected by one or several segments of line passing through said inductor and made with at least one superconductor cable.