US 2020/0091831 A1Published application

Power Conversion Device and Three-Phase Power Conversion Device

AssigneeHitachi, Ltd.

InventorsMitsuhiro KADOTA, Takae SHIMADA

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Abstract

A power conversion device includes: power conversion cells; and a controller to control the cells. Each cell includes: a transformer; a primary conversion unit on a primary side of the transformer; a secondary conversion unit on a secondary side; a primary bypass device for short-circuiting between input terminals of the cell; and a secondary bypass device for short-circuiting between output terminals of the cell. The input terminals and/or the output terminals of the cells are connected in series. When the primary conversion unit(s) of a part of the cells is stopped, the controller turns on the primary bypass device and sets secondary DC link voltages to prescribed values; and when the secondary conversion unit(s) of a part of the cells is stopped, the controller turns on the secondary bypass device and controls the primary conversions units to set primary DC link voltages to prescribed values.

Claims9

Dependent claims

A power conversion device comprising:

a plurality of power conversion cells;
and
a controller configured to control the plurality of power conversion cells,
each power conversion cell comprising:
a transformer;
a primary conversion unit disposed on a primary side of the transformer;
a secondary conversion unit disposed on a secondary side of the transformer;
a primary bypass device for causing a circuit to short between input terminals of the power conversion cell;
and
a secondary bypass device for causing a circuit to short between output terminals of the power conversion cell,
wherein
at least one of the power conversion cell input terminals and the output terminals of the plurality of power conversion cells are connected in series, respectively;
when the primary conversion unit of a part of the plurality of power conversion cells is to be stopped, the controller turns on the primary bypass device and controls the secondary conversion units to set secondary DC link voltages generated in the secondary conversion units to prescribed values;
and
when the secondary conversion unit of a part of the plurality of power conversion cells is to be stopped, the controller turns on the secondary bypass device and controls the primary conversions units to set primary DC link voltages generated in the primary conversion units to prescribed values.

12 more elements

A power conversion device comprising:

a plurality of power conversion cells;
and
a controller configured to control the plurality of power conversion cells,
each power conversion cell comprising:
a transformer;
a primary conversion unit disposed on a primary side of the transformer;
a secondary conversion unit disposed on a secondary side of the transformer;
a secondary bypass device for causing a circuit to short between output terminals of the power conversion cell,
wherein
the power conversion cell output terminals of the plurality of power conversion cells are connected in series;
when the primary conversion unit of a part of the plurality of power conversion cells is to be stopped, the controller controls the secondary conversion units to set secondary DC link voltages generated in the secondary conversion units to prescribed levels;
and
when the secondary conversion unit of a part of the plurality of power conversion cells is to be stopped, the controller turns on the secondary bypass device and controls the secondary conversion units in the other power conversion cells such that the secondary DC link voltages are made larger than in a normal state.

10 more elements

Dependencies are inferred from the claim text.