Power conversion device and method for controlling power conversion device
AssigneeMitsubishi Electric Corporation
InventorsTomohito Fukuda, Hitoshi Kawaguchi, Kikuo Izumi, Masanori Kageyama
Life of this patent
Estimating the term…
Abstract
A power conversion device which converts power between a power grid and a DC power supply, includes: AC/DC converters for performing conversion from AC power to DC power or from DC power to AC power between the power grid and the DC power supply; a capacitor provided on the DC power supply side of the AC/DC converters and storing DC power; and a step-up unit for charging the capacitor.
Claims15
A power conversion device which converts power between a power grid and a DC power supply, the power conversion device comprising:
- an AC/DC converter for performing conversion from AC power to DC power or from DC power to AC power between the power grid and the DC power supply;
- a capacitor provided on a DC power supply side of the AC/DC converter and storing the DC power;
- a step-up unit for charging the capacitor;
- and
- an abnormality detection device provided on the DC power supply side of the AC/DC converter, wherein
- the step-up unit generates voltage for insulation diagnosis based on an insulation diagnosis reference voltage, wherein a source of the insulation diagnosis reference voltage is different from the DC power supply, and applies the voltage for insulation diagnosis to the DC power supply side of the AC/DC converter, to charge the capacitor.
A method for controlling a power conversion device which includes an AC/DC converter for converting power between a power grid and a DC power supply, a capacitor provided on a DC power supply side of the AC/DC converter and storing DC power, and a step-up unit for generating voltage to charge the capacitor, the method comprising:
- an insulation diagnosis step of generating voltage for insulation diagnosis, by the step-up unit, and based on an insulation diagnosis reference voltage, wherein a source of the insulation diagnosis reference voltage is different from the DC power supply, and applying the voltage for insulation diagnosis between the DC power supply and the AC/DC converter;
- and
- a pre-charge step of generating voltage for pre-charging based on voltage of the DC power supply, by the step-up unit, to charge the capacitor, wherein
- the insulation diagnosis step and the pre-charge step are performed before interconnection of the power conversion device with the DC power supply is performed.
Dependencies are inferred from the claim text.