| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electric power storage system that reduces capacity of a secondary battery to be used by limiting loads to which electric power is supplied during a power failure and that is small and cost effective, with regard to the power storage system that charges the secondary battery during a time zone of low electricity rate at night and that interconnects the discharged electric power from the secondary battery to a commercial system during a time zone of large electric power demand at the day time. <P>SOLUTION: When a power failure of the commercial system is detected by a control means 104, a first changeover means 105 is turned off and the second changeover means 110 is turned on. A charge circuit/chopper circuit 107 is controlled in a discharge state by the control means 104. The control of the charge circuit/chopper circuit 107 into the discharge state converts DC electric power from the secondary battery 108 to AC electric power by the charge circuit/chopper circuit 107 and a two-way inverter 106. However, since the first changeover means 105 is controlled to OFF, no electric power is supplied to an ordinary load 102 so that the AC electric power converted from the secondary battery 108 is supplied only to an important load 109. <P>COPYRIGHT: (C)2007,JPO&INPIT |
