| 摘要 |
PROBLEM TO BE SOLVED: To provide a power conversion device that is able to supply power to normal equipment without interruption even in the event of a power system accident and is also able to realize long-time backup while restricting the capacity of an expensive accumulator battery.SOLUTION: A power conversion device comprises:a DC/DC converter 6 connected to a solar battery 1; a bidirectional DCDC converter 7 connected to an accumulator battery 2, outputs from the converters connected to a DC linking capacitor 8 in parallel; an inverter 9 of electric current control type performing discharge/charge between the inverter and a power system 3; an inverter 10 of voltage control type, supplying power to a normal load 4 requiring power failure countermeasure, both inverters using the DC linking capacitor 8 as an input power source; and a controller 5 that controls them. According to power supply amount of the solar battery 1 and accumulator battery 2, the source of power supplied to the normal load 4 is switched by the controller 5.SELECTED DRAWING: Figure 1 |
