| 摘要 |
In a power conversion apparatus that boosts a solar light voltage, converts it to AC and supplies AC power to a load or system, a second inverter 1B-INV is connected in series to one of two terminals on the AC side of a first inverter 3B-INV that uses, as its DC source, a DC voltage V 3B boosted from a solar light voltage V o by a chopper circuit (3), and a third inverter 2B-INV is connected in series to the other terminal. Then, output voltages of the second and third inverters 1B-INV and 2B-INV are controlled to be equal, and an output voltage is provided by using the sum of the generated voltages of the first, second and third inverters. Thus, the mid-point potential of the DC power source V 3B is made equivalent to the intermediate potential of the output voltage of the power conversion apparatus, that is, the mid-point potential (ground potential) of a system (5). |
