Active Power Filter（出口系列）

    Active Power Filter (APF) is a new unit for power harmonic control with modern power electronics and digital signal treatment based on hi-speed DSP elements. APF is a definition compared to passive power filter, while the former actively sends reverse harmonics (so-called “active”) to filter the waves and the latter passively receives (so-called “passive”) waves for filtration. The APF principal of operation is that power filter calculates and injects the same harmonics reversely in the three-phase power system to fully offset such waves (that is, offset and compensation). On the basis of the same principle, APF can correct the power factor and generate 3-phase sinusoidal current wave to meet the load requirements.