Power conversion device, power conversion system, and method for controlling power conversion device
AssigneeHitachi, Ltd.
InventorAkihiko Kanouda
Life of this patent
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Abstract
The objective of the present invention is to reduce the manufacturing costs of an electric power converting device and to reduce the installation space thereof. An electric power converting device comprises: AC/DC converters and AC/DC converters connected in series to an alternating-current power supply; direct-current buses provided on an output side; change-over switches, change-over switches, change-over switches, and change-over switches for selectively connecting the AC/DC converters and the AC/DC converters to each direct-current path; a bus-to-bus connecting switch connecting the direct-current buses in series; and a switch for connecting an electric circuit connected in series by means of the bus-to-bus connecting switch to a load.
Claims13
A power conversion device comprising:
- a plurality of isolated cell converters connected in series to a power supply;
- two or more DC paths provided on an output side;
- a DC path connection means configured to selectively connect each of the isolated cell converters to each of the DC paths;
- a series connection means configured to connect in series two or more of the DC paths;
- and
- a first load connection means configured to connect the DC paths connected in series by the series connection means to a load.
A power conversion system comprising:
- a plurality of isolated cell converters connected in series to a power supply;
- two or more DC paths provided on an output side;
- a DC path connection means configured to selectively connect each of the isolated cell converters to each of the DC paths;
- a series connection means configured to connect in series two or more of the DC paths;
- and
- a first load connection means configured to connect the DC paths connected in series by the series connection means to a load.
A method for controlling a power conversion device, the method executing the steps of:
- of a plurality of DC paths provided on an output side, connecting in series two or more of the DC paths by a series connection means;
- of a plurality of isolated cell converters connected in series to a power supply, allocating and connecting a first number of n isolated cell converters and a second number of m isolated cell converters of the plurality of isolated cell converters to the respective DC paths by a DC path connection means;
- controlling a voltage ratio of each of the DC paths to be n:
- m;
- and
- connecting the DC paths connected in series to a load by a first load connection means.
Dependencies are inferred from the claim text.