Patent ID: 8400792
Filing Date: 2013-03-19
Classification: H02J,H02M

Abstract:
1. A power conversion apparatus, comprising: 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.