POWER CONVERTER WITH MULTI-LEVEL VOLTAGE OUTPUT AND HARMONICS FILTER

摘要

A device for converting a DC voltage into an AC voltage and vice versa comprises at least one phase leg with a first voltage source and a first inductor (9) connected in series between a first DC terminal (4) and a first AC terminal (6) and with a second inductor (10) and a second voltage source connected in series between the first AC terminal (6) and a second DC terminal (5), where each of the voltage sources comprises at least a first and a second submodule (15) in series-connection, each submodule (15) comprising at least one power electronic switch connected in parallel with at least one capacitor. In the device, a passive electronic filter is arranged between the first and the second inductor as well as the first AC terminal for reducing harmonics in a circulating current.