Analysis on Harmonic Transmission Characteristics of Traction Power Supply System During Regenerative Braking of High Speed Train

Traction load is one of the main harmonic sources in power system,and the harmonic problem introduced by regenerative braking of a high-speed train(HST) are attracting much attention.After building a model of high-speed electric multiple unit(EMU) and all-parallel AT-fed traction system,the authors analyze the harmonics generated by the train and their characteristics under traction condition and regenerative braking condition through simulation.The mechanism and harmonic amplification of harmonic transmission are studied as well.The results indicate that the harmonic amplification under regenerative braking condition is more serious than that under traction condition;but the amplification tendency is independent on the operation condition.The results also show that harmonic resonance will happen in the system when the frequency of the harmonic matches with the traction network structure.