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US 12,316,235 B2Granted
Transformer arrangement and method for voltage conversion including a transformer and a converter coupling
AssigneeHitachi Energy Ltd
InventorsRoberto Alves, Panagiotis Bakas, Jan Svensson, Muhammad Nawaz, Seyed Ali Mousavi, Daniel Johannesson, Peter Steimer
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Abstract
A transformer arrangement includes a first and a second arrangement side and a transformer with first windings coupled to the first arrangement side and with second windings having a first to a fourth tap. The transformer arrangement comprises a converter coupling the first, second and 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.
Claims16
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).
11 more elements
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 converter comprises a fourth arm comprising a fourth number of cells and a first terminal connected to the third tap,
- wherein a second terminal of the third arm is connected to a node of the first arm,
- wherein a second terminal of the fourth arm is connected to a node of the second arm, and
- wherein a second terminal of the first arm and a second terminal of the second arm are coupled to a first terminal of the second arrangement side,
- wherein the node of the first arm is located between a first low frequency (LF) part of the first arm and a first high frequency (HF) part of the first arm, and
- wherein the node of the second arm is arranged between a second LF part of the second arm and a second HF part of the second arm.
12 more elements
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,
- a third arm comprising a third number of cells and a first terminal connected to the third tap, and
- wherein the transformer arrangement comprises an output filter circuit, and
- wherein a second terminal of the first arm, a second terminal of the second arm and a second terminal of the third arm are coupled via the output filter circuit to a first terminal of the second arrangement side, and
- wherein the output filter circuit includes a capacitive element connected to the third tap
- 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).
13 more elements
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,
- a third arm comprising a third number of cells and a first terminal connected to the third tap,
- wherein the filter circuitry includes a capacitive element connected to the third tap,
- wherein the transformer arrangement comprises an output filter circuit,
- wherein a second terminal of the first arm, a second terminal of the second arm and a second terminal of the third arm are coupled via the output filter circuit to a first terminal of the second arrangement side, and
- wherein the converter comprises a fourth arm comprising a fourth number of cells and a first terminal connected to the third tap,
- wherein a second terminal of the third arm is connected to a node of the first arm,
- wherein a second terminal of the fourth arm is connected to a node of the second arm, and
- wherein a second terminal of the first arm and a second terminal of the second arm are coupled to a first terminal of the second arrangement side,
- wherein the node of the first arm is located between a first low frequency (LF) part of the first arm and a first high frequency (HF) part of the first arm, and
- wherein the node of the second arm is arranged between a second LF part of the second arm and a second HF part of the second arm.
14 more elements
Dependencies are inferred from the claim text.