Three-Phase Harmonic Selective Active Filter Using Multiple Adaptive Feed Forward Cancellation Method

This paper proposes a three phase harmonic selective active filter with multiple adaptive feed forward cancellation (MAFC) for harmonic reference generation. The MAFC method is derived from previously used adaptive feed forward cancellation (AFC) method used in acoustics. The adaptive law is derived by an SPR (strictly positive real) Lyapunov function. This adaptive method is simple and effective in extracting fundamental and harmonic current information from nonlinear load current. The effectiveness of this method is verified by testing experimentally a nonlinear load current. The extracted harmonic currents are used as the reference signals for the active filter harmonic selective cancellation control. The active filter feature´s harmonic selective ability reduces the active power filter rating, bandwidth requirements and enhances its flexibility. Simulation results are used to validate the control of this harmonic selective active filter system