POWER CONVERSION APPARATUS
1 Assignment
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Accused Products
Abstract
A power conversion apparatus includes an inverter for converting DC power to AC power for supply to a load, a converter for converting AC power from an AC power supply to DC power for supply to the inverter, and a DC voltage converter for converting a voltage value of power stored in a storage battery and supplying DC power from the storage battery to the inverter when power supply by the AC power supply is abnormal. The converter includes a first three-level circuit which is a multi-level circuit. Similarly, the DC voltage converter includes a second three-level circuit. A control device controls the first and second multi-level circuits to suppress potential fluctuation at a neutral point between first and second capacitors.
68 Citations
22 Claims
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1-6. -6. (canceled)
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7. A power conversion apparatus, comprising:
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first and second capacitors connected in series between a DC positive bus and a DC negative bus; a first conversion device including a first multi-level circuit configured to be able to perform conversion between a DC voltage and an AC voltage varying among at least three voltage values and connected to said DC positive bus, said DC negative bus and a neutral point between said first and second capacitors, for converting DC power to AC power for supply to a load; a second conversion device including a second multi-level circuit identical in configuration to said first multi-level circuit and connected to said DC positive bus, said DC negative bus and said neutral point in parallel to the first multi-level circuit, for converting AC power from an AC power supply to DC power for supply to said first conversion device; a DC power supply source for supplying DC power to said first conversion device; a filter including a reactor and a capacitor, for removing a harmonic generated by said first conversion device; and a control device for controlling an operation of said second multi-level circuit to suppress potential fluctuation at said neutral point. - View Dependent Claims (8, 9, 10)
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11. A power conversion apparatus, comprising:
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first and second capacitors connected in series between a DC positive bus and a DC negative bus; a first conversion device including a first multi-level circuit configured to be able to perform conversion between a DC voltage and an AC voltage varying among at least three voltage values and connected to said DC positive bus, said DC negative bus and a neutral point between said first and second capacitors, for converting DC power to AC power for supply to a load; a second conversion device including a second multi-level circuit identical in configuration to said first multi-level circuit and connected to said DC positive bus, said DC negative bus and said neutral point in parallel to the first multi-level circuit, for converting AC power from an AC power supply to DC power for supply to said first conversion device; a third conversion device including a third multi-level circuit configured to be able to perform conversion between a DC voltage and a DC voltage varying among at least three voltage values and connected to said DC positive bus, said DC negative bus and said neutral point in parallel to said first and second multi-level circuits, for converting a voltage value of DC power from a DC power supply source and supplying the DC power from said DC power supply source to said first conversion device; a filter including a reactor and a capacitor, for removing a harmonic generated by said first conversion device; and a control device for controlling an operation of said third multi-level circuit to suppress potential fluctuation at said neutral point. - View Dependent Claims (12, 13, 14)
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15. A power conversion apparatus, comprising:
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first and second capacitors connected in series between a DC positive bus and a DC negative bus; a first conversion device including a first multi-level circuit configured to be able to perform conversion between a DC voltage and an AC voltage varying among at least three voltage values and connected to said DC positive bus, said DC negative bus and a neutral point between said first and second capacitors, for converting DC power to AC power for supply to a load; a second conversion device including a second multi-level circuit identical in configuration to said first multi-level circuit and connected to said DC positive bus, said DC negative bus and said neutral point in parallel to the first multi-level circuit, for converting AC power from an AC power supply to DC power for supply to said first conversion device; a third conversion device including a third multi-level circuit configured to be able to perform conversion between a DC voltage and a DC voltage varying among at least three voltage values and connected to said DC positive bus, said DC negative bus and said neutral point in parallel to said first and second multi-level circuits, for converting a voltage value of DC power from a DC power supply source and supplying the DC power from said DC power supply source to said first conversion device; a filter including a reactor and a capacitor, for removing a harmonic generated by said first conversion device; and a control device for controlling operations of said second and third multi-level circuits to suppress potential fluctuation at said neutral point. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification