Analysis of Harmonic Amplification Induced by Non-linear Loads

High-quality power should be a sinusoidal waveform with a constant frequency and voltage standard, but the use of modern equipment, including semiconductor switchgear, ferromagnetic saturated equipment, arc-type equipment, and other diverse load types, as well as access to new energy sources and large-scale application of direct-current transmission, has led to widespread harmonic problems. Harmonics injected into the power grid produce amplification in the process of transmission, which seriously reduces the power quality. In the paper, on the basis of analysing the transmission characteristics of harmonics through power components, an equivalent impedance model is built for the abnormal amplification of harmonic voltages actually occurring, the harmonic voltage transmission relationship is analysed by MATLAB simulation software to confirm the cause of harmonic voltage amplification, and the correctness of the above analysis is verified by using ETAP software simulation. Finally, a harmonic suppression scheme is proposed to reduce the harmonic voltage distortion rate.