| 摘要 |
PURPOSE:To convert the output of a solar battery without stopping an inverter by controlling the inverter by the output of CT of the output side of the inverter to be operated by the linkage with the commercial power sources through the conversion of the output of the solar battery. CONSTITUTION:An output from a solar electric power generator 1 is converted by an inverter 3, higher harmonics are filtered by a filter 6, and the power is linked to a commercial power system 4 after closing a switch 5. An output current II of the inverter 3 and a voltage VS of a power distribution system 4 are input to an AC detector 7 connected to the secondary side of CT10 of the output side of the inverter 3, an AC signal 7a' is determined and input to a control protection circuit 9. On the other hand, DC input VD is detected by a detector 8 and input to a control protection circuit 9. The control protection circuit 9 forms a drive signal 9a by signals VD and 7a', controls the inverter 3, and reduces a current II when the output current II exceeds the predetermined value. By doing this, the stop of inverter 3 is prevented even if a temporary fluctuation occurs in the power distribution system 4 and safe operation is continued. |
