| 摘要 |
PURPOSE:To connect an arbitrary energy storage unit of a plurality of energy storage units to any uninterruptible power source by connecting the plurality of energy storage units to a common DC bus through a circuit having first, second semiconductor switches connected in anti-parallel with each other. CONSTITUTION:When a defect occurs in an uninterruptible power source (OPS) 1A, breakers 21A, 24A, 25A are opened. Here, if an energy storage unit 3A is normal, a DC switch 26A is closed, then a DC switch 26B of a UPS 1B is closed, and a first semiconductor switch 28B is closed to connect the unit 3A to the UPS 1B. Accordingly, charging energy from the UPS 1B is supplied to a storage unit 3B, and supplied to the unit 3A in a circuit of the switch 26B, the switch 28B, a DC common bus 27, a diode 29A and the switch 26A. When AC inputs 101A, 101B, 101C are interrupted, switches 28A, 26C are closed to supply energy of the unit 3A to the UPSes 1B, 1C. |
