| 摘要 |
PURPOSE: To continue the rated output by an apparatus even when a current to be compensated exceeds the rated value of the apparatus. CONSTITUTION: In a control circuit for a balanced three-phase apparatus which detects the basic wave reverse phase components of three-phase currents as DC component by three-phase/two-phase converter 1, a reverse rotation coordinate converter 2 and low-pass filters 31, 32, detects the basic reverse phase current by a reverse rotation coordinate reverse converter 8 and a two-phase/ three-phase converter 9 at the DC component to compensate it, a detected gain regulator 7 is connected between the filters 31 , 32 and the converter 8, and the absolute value of the DC component from the filters 31 , 32 is detected by a circuit having an absolute value converter 5 and multi-stage comparator 6. The gain of the regulator 7 is so regulated that the reverse phase component from the two-phase/three-phase converter does not exceed the rated value of the apparatus. |
