Power conversion device for converting DC power to AC power
AssigneeToshiba Mitsubishi-Electric Industrial Systems Corporation
InventorsKazuhide Eduardo Sato, Masahiro Kinoshita, Yushin Yamamoto, Tatsuaki Amboh
Life of this patent
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Abstract
A power conversion device includes an inverter for converting DC power to AC power to supply the AC power to a load, a converter for converting AC power from an AC power supply to DC power to supply the DC power to the inverter, a DC voltage converter for converting a voltage value of power stored in a storage battery to supply DC power from the storage battery to the inverter when power supply by the AC power supply is abnormal, and a filter which includes a reactor and a capacitor and removes harmonics generated by the inverter. The inverter includes a three-level circuit constituted of an arm and an AC switch.
Claims18
A power conversion device comprising:
- a converter including a multi-level circuit configured to be capable of conversion between a DC voltage and an AC voltage varying between at least three voltage values, and converting DC power to AC power to supply the AC power to a load;
- a filter including a reactor and a capacitor and removing harmonics generated by said converter;
- a DC power supply generating DC power;
- a DC positive bus and a DC negative bus for transmitting said DC power to said converter;
- and
- first and second capacitors connected in series between said DC positive bus and said DC negative bus,
- said multi-level circuit including:
- first and second semiconductor switching elements connected in series between said DC positive bus and said DC negative bus;
- first and second free-wheeling diodes connected in anti-parallel to said first and second semiconductor switching elements, respectively;
- and
- an AC switch connected between a neutral point of said first and second capacitors and a connection point of said first and second semiconductor switching elements.
A power conversion device comprising:
- a first converter including a first multi-level circuit configured to be capable of conversion between a DC voltage and an AC voltage varying between at least three voltage values, and converting DC power to AC power to supply the AC power to a load;
- a filter including a reactor and a capacitor and removing harmonics generated by said first converter;
- a second converter converting AC power from an AC power supply to DC power;
- a DC power supply generating DC power;
- a DC positive bus and a DC negative bus for transmitting DC power generated at said second converter and said DC power supply to said first converter;
- and
- first and second capacitors connected in series between said DC positive bus and said DC negative bus,
- said first multi-level circuit including:
- first and second semiconductor switching elements connected in series between said DC positive bus and said DC negative bus;
- first and second diodes connected in anti-parallel to said first and second semiconductor switching elements, respectively;
- and
- an AC switch connected between a neutral point of said first and second capacitors and a connection point of said first and second semiconductor switching elements.
A power conversion device comprising:
- a first converter including a first multi-level circuit configured to be capable of conversion between a DC voltage and an AC voltage varying between at least three voltage values, and converting DC power to AC power to supply the AC power to a load;
- a filter including a reactor and a capacitor and removing harmonics generated by said first converter;
- a second converter converting AC power from an AC power supply to DC power;
- a third converter converting a voltage value of power stored in a power storage device to generate DC power when power supply by said AC power supply is abnormal;
- a DC positive bus and a DC negative bus for transmitting DC power generated at said second and third converters to said first converter;
- and
- first and second capacitors connected in series between said DC positive bus and said DC negative bus,
- said first multi-level circuit including:
- first and second semiconductor switching elements connected in series between said DC positive bus and said DC negative bus;
- first and second diodes connected in anti-parallel to said first and second semiconductor switching elements, respectively;
- and
- an AC switch connected between a neutral point of said first and second capacitors and a connection point of said first and second semiconductor switching elements.
Dependencies are inferred from the claim text.