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Abstract
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This paper introduces a new method based on the finite impulse response (FIR) filter and inverse discrete wavelet transform (IDWT) in order to separate the fundamental component from the non-ideal load voltage. Then, the proposed method is applied to the single-phase shunt active power filter. The presented simulation and experimental results show that in the sug-gested indirect method (IM), the compensation of the load current will continue correctly even under non-sinusoidal load terminal voltage. For this purpose the fundamental component of load terminal voltage is extracted by the new proposed method, and the second-order gener-alized integrator (SOGI) is used for improving the total harmonic distortion (THD) of the
source side current. The operations of the proposed control method are confirmed by the simulations and experimental results using MATLAB software and the laboratory prototype, respectively.
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