Electric system and regeneration control device

Abstract

This invention relates to an electric system that connects to both a DC system and an AC system, and appropriately supplies power to the DC system. The electric system 6 includes: a motor drive unit 12 that converts the DC voltage in the DC unit 16 into an AC voltage to drive a motor 3; a rectifier unit 10 connected between the AC system 41 and the DC unit 16; and a regenerative control device 2 connected between the DC system 42 and the DC unit 16 and having an arithmetic unit 20. The arithmetic unit 20 incorporates a status acquisition unit and a current limiting unit in the electric system 6. The status acquisition unit acquires the voltage difference between the DC system 42 and the DC unit 16, and / or the current between the DC system 42 and the DC unit 16. The current limiting unit, based on the information acquired by the status acquisition unit, limits the flow of power from the DC unit 16 to the DC system 42.

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