| 摘要 |
PURPOSE:To prevent the outflow of higher harmonics to an external power system automatically even when a part in a plurality of APFs are stopped by a fault, etc., by installing an APF load switching unit distributing higher harmonic currents for reducing higher harmonics bone by the stopped APF to another sound APF. CONSTITUTION:An APF load switching unit 11 fetches higher harmonic currents from current signals 12a-12c from current transformers 9a-9c mounted on the input circuits of higher harmonic inverters 6a-6c using motors 7a-7c as load, and automatically controls the load distribution of APFs 4a-4c. When partial devices in the APFs 4a-4c are stopped due to a fault, etc., the stop signals and the linkage signals of the interlinked circuit breakers 5a, 5b of a power supply system are input, and higher harmonic currents, which must be bone by the stopped devices, are added to higher harmonic currents in residual sound devices in the APFs 4a-4c, and distributed. Higher harmonic currents, to which the burden sections of the stopped devices are added and which have antiphase, are output from the residual sound devices. |
