| 摘要 |
PURPOSE:To provide an active filter capable of absorbing the higher harmonic up to a high frequency by combining a current shape converter needing no AC reactor on an output side and a capacitor bypassing a higher harmonic current. CONSTITUTION:This active filter is provided with capacitors 5 to 17 bypassing at least higher harmonic current and provided between and AC power source 1 and a higher harmonic generation source 8, the current shake converter 9 composed by bridge-connecting self arc-extinction switching elements 10 to 33 and connecting a DC reactor between its DC terminals and a control means detecting the higher harmonic component of a current flowing between the AC power source 1 and the capacitors 5 to 7 and controlling the output current of the current shake converter 9 based on the higher harmonic component so as to negate the higher harmonic component generated from the higher harmonic generation source 8. |
