| 摘要 |
PROBLEM TO BE SOLVED: To highly accurately detect individual operation of a system connected type inverter, moreover with less power loss. SOLUTION: A reference harmonic is superposed on an inverter output by higher harmonic superposition means 11 and 12, the same orders of harmonic components as those of a reference harmonic is extracted from the inverter output where the reference harmonic has been superposed by a harmonic detection means 14, and the extracted harmonic components are compared with the reference harmonic by detection means 16, 18, 19 and 20, 21, 22, 23, and 24. The individual operation of the inverter is detected based on the comparison result. |
