US 12,316,235 B2
Transformer arrangement and method for voltage conversion including a transformer and a converter coupling
Roberto Alves, Västerås (SE); Panagiotis Bakas, Västerås (SE); Jan Svensson, Västerås (SE); Muhammad Nawaz, Bro (SE); Seyed Ali Mousavi, Västerås (SE); Daniel Johannesson, Västerås (SE); and Peter Steimer, Ehrendingen (CH)
Assigned to Hitachi Energy Ltd, Zurich (CH)
Appl. No. 18/023,116
Filed by Hitachi Energy Ltd, Zürich (CH)
PCT Filed Oct. 4, 2021, PCT No. PCT/EP2021/077275
§ 371(c)(1), (2) Date Feb. 24, 2023,
PCT Pub. No. WO2022/073919, PCT Pub. Date Apr. 14, 2022.
Claims priority of application No. 20200063 (EP), filed on Oct. 5, 2020.
Prior Publication US 2023/0327571 A1, Oct. 12, 2023
Int. Cl. H02M 5/12 (2006.01)
CPC H02M 5/12 (2013.01) 16 Claims
OG exemplary drawing
 
1. A transformer arrangement, comprising,
a first and a second arrangement side,
a transformer with first windings coupled to the first arrangement side and with second windings having a first to a fourth tap,
a converter coupling the first, the second and the third tap to the second arrangement side,
a first filter circuit coupling the first tap to the third tap, and
a second filter circuit coupling the third tap to the second tap, wherein the converter comprises,
a first arm comprising a first number of cells and a first terminal connected to the first tap,
a second arm comprising a second number of cells and a first terminal connected to the second tap, and
a third arm comprising a third number of cells and a first terminal connected to the third tap, and
wherein the third number of cells is less than the first number of cells and is less than the second number of cells,
wherein the first arm comprises a first low frequency (LF) part and a first high frequency (HF) part,
wherein the second arm comprises a second LF part and a second HF part,
wherein the third arm comprises a third HF part,
wherein a first internal filter of the converter couples a node between the first LF part and the first HF part to a neutral point (NP), and
wherein a second internal filter of the converter couples a node between the second LF part and the second HF part to the neutral point (NP).