| 摘要 |
A hybrid filter type harmonic frequency reducing apparatus is provided to effectively suppress a harmonic frequency from being delivered to a power system by using an active filter, which supplements operation of a passive filter. A hybrid filter type harmonic frequency reducing apparatus includes a power system(10), a load(30), a hybrid filter circuit unit(50), and first and second waveform correction units(40a,40b). The load receives power from the power system. The hybrid filter circuit unit is connected to respective phase lines between the power system and the load and a neutral line, and reduces a harmonic frequency, which is delivered from the load to the power system. An active filter unit and a passive filter unit are series-connected to each other and connected in parallel between the respective phase lines and the neutral line. The first waveform correction unit is connected between the power system and the hybrid filter circuit to adjust a threshold impedance of power system. The second waveform correction unit is connected between the hybrid filter circuit and the load to compensate for the signal waveform by suppressing an excessive load.
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