... active harmonic filter (APF/AHF), where, Vs is AC power supply, nonlinear load is harmonic source, it ... switching frequency Response time <10msSingle capacity up to 400ASuppress three-phase unbalanceConform to IEEE Std. 519-1992, GB/T ... 2Power Supply Frequency (Hz)50/60Hz3Power Supply ModeThree-phase three wires or three-phase four wires4Harmonic Compensation Components2~505Response Time (ms)< ...