| 摘要 |
<P>PROBLEM TO BE SOLVED: To quickly transition to an autonomous operation when an inverter detects a single operation or when a system voltage is reduced. <P>SOLUTION: A bi-directional power conversion circuit 2 and inverter bridges 4u and 4v converting a power from a battery 1 into an AC voltage are provided. The inverter bridges are operated as a converter when the battery 1 is charged from a system power supply 13, and the inverter bridges are operated as an inverter when the battery is discharged. At an interconnected operation, interconnected relays 10u and 10v are turned on and autonomous relays 31u, 31v and 31n are turned off by an inverter output to supply a power to a single-phase three-wire load. System relays 30u and 30v arranged in series to the interconnected relays and operating with the autonomous relays are turned on to supply a power to the system power supply. In the case that the system voltage is lost, the interconnected relays are turned off and the system relays are turned off, and autonomous relays are turned on in conjunction with turning off of the system relays to switch over to an autonomous operation for supplying a power from the battery to the single-phase three-wire load. <P>COPYRIGHT: (C)2013,JPO&INPIT |
