A new method for calculating the reference current of shunt active power filters based on recursive discrete Fourier transform

This paper presents a new method based on the fundamental active current component determined from a recursive discrete Fourier transform block. The reference source current and the reference compensating current for shunt active power filters is calculated based on this method to eliminate harmonics, compensate the reactive power of the three-phase diode bridge rectifier with RL load, and to increase power quality. An interval type-2 fuzzy logic controller is used to maintain the DC-link voltage at the reference value. The proposed method is presented and applied to the control system of the voltage source shunt active power filter to evaluate its performance. The results are compared with p-q theory of other reference generation methods. The simulation results confirm the effectiveness of this method in reducing total harmonic distortion and reactive power.