| 摘要 |
PROBLEM TO BE SOLVED: To reduce loss during independent operation and obviate a transformer for load by interlocking a boosting chopper during linked operation and stopping it during independent operation, and supplying a load with 100V alternating- current. SOLUTION: A load 9 is isolated from a system 7 by means of a switch 10 during linked operation. If any trouble occurs in the system 7, a switch 6 is opened to disconnect a power converter 2 from the system 7, and the power converter 2 switches to independent operation. An inverter exercises control so that output voltage will be 100V alternating-current. When the operation of a boosting chopper 2 is stopped and the switch 10 is closed to stop the boosting chopper 2 that supplies a load 9 with power, a direct-current voltage generated using a solar cell 1 is applied direct to a smoothing capacitor 4. As a result, the input voltage, that is, the voltage of the smoothing capacitor 4, required for the inverter 5, is only half of that during linked operation. This reduces the loss in the voltage converter and obviates a transformer for load. |
