| 摘要 |
PURPOSE:To prevent the compensating function from deteriorating due to increase of basic wave voltage being applied to a PWM converter caused by the fluctuation of power supply frequency being applied to a resonant active filter system utilizing parallel resonance. CONSTITUTION:Basic wave reactive current igl flowing through a resonant auxiliary reactor 5, connected in parallel between a resonance circuit part 3 and an AC reactor 6, is detected and multiplied by a gain K in reverse phase to produce a current which is fed additionally to a PWM converter 7 thus reducing the value of the resonant auxiliary reactor 5 equivalently with respect to the basic wave frequency and lowering the basic wave voltage being applied to the PWM converter 7. |
