Voltage Harmonic and Interharmonic Detection Method for DC Microgrid based on Hanning Window Interpolation

Abstract

Abstract With the development of power electronics technology and the increasing DC sensitive load, DC microgrid is an important direction for future power distribution. At present, there are few studies on the power quality of DC microgrids. This paper introduces a DC voltage harmonic and interharmonic detection method suitable for DC microgrid. The voltage of the DC microgrid is divided into DC voltage and harmonics and interharmonics, and they are studied separately. For the DC voltage, use the regression equation to represent and restore it. For harmonics and interharmonics, the method of windowed Fourier transform is used for analysis, and the quadratic interpolation method is used for correction.Through simulation, the detection and reduction of DC voltage harmonics and interharmonics under various operating conditions are analyzed. Finally, the feasibility and accuracy of this algorithm are verified.