| 摘要 |
PROBLEM TO BE SOLVED: To provide an uninterruptible power supply system with fault clear capability and a bypass method in the uninterruptible power supply system.SOLUTION: An uninterruptible power supply system 100 comprises: a first three-phase AC source 108; a DC source 110; and a power converter 102 receiving AC power from the first AC source and/or DC power from the DC source and delivering two-wire DC power to a load 118. In the uninterruptible power supply system, one pole of a DC output line 116 is connected to the neutral reference of a four-wire AC-power supply line 112, and a bypass device 142 and the power converter are connected in parallel to the DC output line. The bypass device comprises at least one switching unit and a control unit. The switching unit is controlled by the control unit to supply pulsed power from an AC power supply with essentially the same polarity as the DC output line.SELECTED DRAWING: Figure 2 |
