| 摘要 |
<p>PURPOSE:To reduce the ripple current of a specific frequency contained in a feedback current by sorting the pulsating voltage of the specific frequency from the voltage of a capacitor for a DC filter circuit, inverting the phase by a transformer and applying it to a DC side. CONSTITUTION:DC power collected by a pantograph 1 is supplied through a DC filter formed by connecting a reactor 5 and a capacitor 6 in an inverted L shape and a variable voltage and variable frequency inverter 7 to an induction motor 8. A band pass filter 9 selects the ripple voltage of the specific frequency from the DC trolley wire voltage, inverts the phase by a transformer 11, and applies it to the DC side. Thus, the ripple current of the specific frequency can be reduced without using a reactor and a capacitor for a large size and large capacity filter.</p> |
