Single-phase active power filter using FFT with harmonic phase-delay compensation

This paper describes a single-phase active power filter based on newly developed digital controller. The developed controller utilizes FFT algorithm to extract the reference signal from the load current, considering the phase-angle delay of each harmonic component. Optimizing technique was applied for whole control algorithm to implement the real-time operation of developed controller. The performance of developed controller for a single-phase active power filter was verified through computer simulations. The feasibility of hardware implementation was confirmed building and testing a prototype of whole system. The developed digital controller for a single-phase active power filter can compensate the harmonic current generated by the power supply for digital equipment.