| 摘要 |
PURPOSE:To suppress pulsation of current without increasing DC reactance of main circuit by detecting a pulsating current and calculating a correction amount based on a detection signal. CONSTITUTION:A current detecting circuit detects pulsation of current. Thus detected pulsating current is passed through a filter in order to take out a controllable pulsating current which is then differentiated through a differentiating circuit and multiplied by the reactance component of the circuit through a multiplier thus calculating a correcting amount. Since the correcting amount is equal to a voltage component Vc=LdiL/dt, pulsation of current can be canceled by inverting the correcting amount Vc. When the correcting amount(-Vc) in a formula L=diL/dt+(-Vc)=0 is applied on the phase control in a voltage control section, i.e., a converter, pulsation of current can be canceled and suppressed. |
