Uninterruptible Power Source Device And Power Supply System

Abstract: An uninterruptible power source device (10) is connected to an AC system (1) and a DC grid (6). The DC grid (6) includes a DC bus (7) connected to the AC system (1) through an AC/DC converter (5), a distributed power source (61) that outputs the generated DC power to the DC bus, and a DC load (65) that receives the DC power of the DC bus (7). The uninterruptible power source device (10) comprises: a DC link (12) for transmitting/receiving DC power; a converter (11) that converts AC power supplied from the AC system (1) into DC power and supplies the DC power to the DC link (12); an inverter (14) that converts DC power received from the DC link (12) into AC power and supplies the AC power to an AC load (8); and a DC/DC converter (16) that has a first DC terminal (T1) connected to the DC link (12), a second DC terminal (T2) connected to a power storage device (9), and a third DC terminal (T3) connected to the DC bus (7), and is configured to redistribute DC power between the first to third DC terminals.

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