Research on Harmonic Transmission Characteristics of AC power grid

With the access of a large number of power electronic devices, the harmonic isusse of power grid is becoming more and more prominent. Harmonics can be transferred between different voltage levels and the same voltage level in the AC power grid, and assessment of harmonic transfer characteristics is the basis for harmonic management. The transmission characteristics of harmonic voltage and harmonic current between different voltage levels are analyzed, and the transmission characteristics of harmonics caused by AC overhead lines in the same voltage level grid are studied. The research in this paper can provide theoretical basis for the transmission of harmonics in large power grids.