| 摘要 |
PROBLEM TO BE SOLVED: To provide a controller for inverters for system interconnection that allows an inverter to continue to stably supply power to a load for itself even if interconnection with an a. c. system is out off. SOLUTION: A reference current correcting operation circuit 130 outputs a reference active current correction value Iqd and a reference reactive current correction value Igd corresponding to the differences between an active voltage and a reactive voltage to be supplied to a load and their reference values, respectively. A frequency correcting operation circuit 160 calculates a reference reactive current correction value IFd corresponding to the difference between the frequency of voltage supplied to the load and the rated frequency. A reference current adding circuit 110 adds the reference active current correction value Iqd to a reference active current Iqc to make a correction, and adds the reference reactive current correction values Igd , IFd to a reference reactive current Idc to make a correction. A current control circuit 105 obtains the reference output voltage of an inverter based on a corrected reference active current Iqm and a corrected reference reactive current Idm output from the reference current adding circuit 110. |
