中文摘要：

电气化铁路牵引负荷是电力系统中的主要谐波源之一，再生制动时高速动车组作为特殊情况下的牵引负荷带来的谐波问题更加突出。在建立高速动车组和全并联自耦变压器牵引网模型的基础上，仿真分析了高速动车组牵引工况和再生制动工况时牵引供电系统中的谐波特性及其传输情况，并从理论上分析了谐波传输的机制。结果表明，高速列车再生制动工况时会在牵引网供电系统中引起更大的谐波畸变，但谐波的放大趋势与动车组的工况无关，当某次谐波的频率与牵引网的结构相匹配时，则会在系统中出现谐振现象。

英文摘要：

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.