FFT Based Reference Signal Generation and Selective Harmonic Elimination PWM to Minimize Harmonics in Line Using DVR

Series connected custom power device called as dynamic voltage restorer (DVR) is the most effective device used in electrical systems to compensate power quality problems. Traditional DVR compensates only voltage sag/swell in electrical grids. The main contribution of this project is that FFT based a novel reference generation method is used in DVR to compensate unbalanced voltage harmonics, simultaneously. In this study, FFT achieves voltage harmonics extraction and FFT controlled DVR compensates unbalanced selective voltage harmonics (5th, 7th, 11th and 13th) in the system. The performance of proposed controller method is presented and confirmed through simulation in MATLAB/Simulink environment.