Abstract：Research purposes：The electric phase separation of the electrical railway can be completely cancelled in the advanced co-phase traction power supply system，which is based on three-phase to single-phase converters，and the power quality of the system can be improved greatly．Each part of the harmonic waves of the three-phase to single- phase convener，a primary structure of the system，is calculated in detail in this paper．A simulation model is built up through Matlab／Simulink to verify the theoretical calculation．
Research conclusions：(1)When adopting SPWM modulation to the inverter and the switching frequency is far higher than the basic frequency，the output harmonic voltage is reflected on mostly in low-order harmonics，especially 3 th， 5th，7th，9th．However the current absorbed from the DC side definitely contains a 2-order harmonic．(2)When adopting SVPWM modulation to the rectifier，the input voltage contains non 3-times frequency of harmonic and the input current is influenced by the filter inductance and the DC voltage，namely，THD of the current rises along with the increasing DC voltage and drops with the decreasing inductance．(3)The proposed theoretical calculation in this paper can be easily achieved with a computer program．(4)The paper can provides the theoretical calculation evidence for the possible harmonic，resonance problems and their suppression that may occur in the further research of the advanced CO-phase traction power supply system，and also for other AC-DC-AC converters．
何晓琼,王晨丞,文德智,舒泽亮,肖建. 用于贯通式牵引供电系统变换器的谐波分析[J]. 铁道工程学报, 2013, 30(12): 74-79.
HE Xiao-qiong，WANG Chen-cheng，WEN De-zhi，SHU Ze-liang，XIAO Jian. The Harmonic Analysis of the Three-phase to Single-phase Converter Applied to the Advanced Co-phase Traction Power Supply System. Journal of Railway Engineering Society, 2013, 30(12): 74-79.
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2013, Vol. 30 
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