Active Harmonic Filter
Active harmonic filter is type of analogue electronic filter. Uses OP AMP. Needs external power source. Injects phase opposite harmonic. Have energy losses. Its design needs passive components like capacitor and resistance. The inherited capacitor helps in increasing the load power factor. However, If the load size is high enough and needs higher reactive power compensation, active harmonic filter can't deliver that and requires an additional STATCOM to work in conjunction with it.