Abstract
The direct computation method (DCM) and discrete Fourier series method (DFSM) are two very similar real-time detection methods for harmonic and reactive currents. In order to determine whose detection performance is better, using MATLAB 7.0, simulation comparisons are conducted. The results indicate that the detection precision of DCM is higher than that of DFSM when the power supply frequency fluctuates, and the power supply voltage has no distortion. The detection precision of DCM is also higher than that of DFSM when the power supply frequency has no fluctuation, and the power supply voltage distorts. Therefore, the detection performance of DCM is better than that of DFSM.Keywordsactive power filterharmonic and reactive currentsdirect computation methoddiscrete Fourier seriesdetection precision
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