| 摘要 |
PROBLEM TO BE SOLVED: To provide a power converter which can use a safe small-sized filter for system interconnection, because the input and output of the converter are insulated from each other, and can be used for low-voltage solar batteries. SOLUTION: A photovoltaic power converter is constituted to convert the power generated from a solar battery 12 into three-phase AC power and provided with a first power converter 11 which converts DC power from the battery 12 into AC power, a transformer 10 which inputs the output of the converter 11 through its primary side and outputs an insulated output from the secondary side, and (3×n) sets of second power converters 1 which convert the insulated power from the transformer 10 into single-phase AC power. The single-phase AC output terminals of the converters 1 are divided into three units, with each unit being composed of (n) sets of output terminals connected in series, and the units are connected in star connection by using any terminal of the output lines of the units as a neutral point. The other terminals of the three output lines are connected to a system power source 19 and the AC outputs among the three units are subjected to multiplex PWM pulse width modulation so that the AC outputs can be shifted from each other by electrical angles of 120 deg. and regenerated to the source 19. |
