Nissin Electric Co., Ltd.

Satoshi Uda

Shoji Nishimura

Yoshinori Kawasaki

An uninterruptible power supply device provided between a commercial power system and an essential load and supplying AC power to the essential load includes: a power supply part that has an energy storage device and is connected to a power line for supplying power from the commercial power system to the essential load; an open switch for opening/closing the power supply line, the open switch being provided on the power line on the commercial-power-system side of the power supply part; a system abnormality detection part for detecting a system abnormality occurring on the commercial-power-system side of the open switch; and a control part that, when the detected system abnormality is equal to or greater than the tolerance of the essential load or the power supply part against system abnormalities, opens the open switch and supplies AC power from the power supply part to the essential load.

Uninterruptible power supply device

Provided is an uninterruptable power supply device. An uninterruptable power supply device, which is provided between a commercial power systemand an essential loadand which provides AC power to the essential load, wherein the uninterruptable power supply deviceis provided with: a power supply unit, which has a power converterand a storage batteryand which is connected to a power line L; an open switchfor opening the power supply line L; a system abnormality detection unitfor detecting a system abnormality, which is at least one of voltage rise, phase fluctuation, voltage imbalance, harmonic abnormality, and flicker, in addition to at least one of frequency fluctuation and voltage drop including instantaneous voltage drop; and a control unitwhich, opens the open switchand supplies AC power to the essential load

Uninterruptable power supply device

Provided is a power supply system comprising: distributed energy resources () connected to a power line (L) for feeding power from a commercial power system () to an important load (); a switch () provided in the power line (L) for opening and closing the power line (L); an impedance element () connected in parallel to the switch () in the power line (L); a voltage detection unit () for detecting a voltage on the commercial power system () side with respect to the switch (); and a control unit () for releasing, when a voltage detected by the voltage detection unit () becomes equal to or lower than a set point, the switch () such that the distributed energy resources () and the commercial power system () are connected through the impedance element (), and the distributed energy resources () continue operation including reverse power flow.

Growing community of inventors

Kyoto, Japan

Satoshi Uda