POWER CONVERSION DEVICE

Title:

POWER CONVERSION DEVICE

Document Type and Number:

WIPO Patent Application WO/2016/031430

Kind Code:

A1

Abstract:

A power conversion device that can keep a neutral potential constant is provided. Said power conversion device, which converts power between AC and DC, is provided with the following: series-connected capacitors 2a, 2b that are connected in parallel with a DC power supply 20 and divide an input DC voltage therefrom so as to create a neutral potential; a plurality of legs 3 that are each connected in parallel with the DC power supply 20 and that contain chopper cells C for converting DC to AC; and a control unit that controls circulating currents that are made to flow through the legs 3 for the respective phases in order to balance the chopper-cell output voltages in the respective legs 3. The control unit contains a neutral-potential control unit that superimposes, onto the DC circulating current made to flow between DC terminals for each phase, a neutral current for keeping the abovementioned neutral potential constant. Said neutral-potential control unit makes at least one of the abovementioned capacitors 2a, 2b circulate the circulating currents with the aforementioned neutral currents superimposed thereupon.

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Inventors:

HASEGAWA RYUTA (JP)
SUZUKI DAICHI (JP)

Application Number:

PCT/JP2015/070665

Publication Date:

March 03, 2016

Filing Date:

July 21, 2015

Export Citation:

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Assignee:

TOSHIBA KK (JP)

International Classes:

H02M7/49; H02M7/487; H02M7/797

Foreign References:

JP2013099054A	2013-05-20
JP2013143836A	2013-07-22
JP2014096969A	2014-05-22

Other References: