AHF

AHF is an IGBT based Inverter used for harmonic mitigation. AHF detects the difference between the ideal current sine wave and the actual current which has been deformed by harmonics. It then injects this difference, which is the negative of the harmonic currents present in the load current, into the system on a real-time basis. This cancels out the high frequency harmonics and results in almost pure sine wave.