| The electrified railway was born in development, has brought great convenience to people’s life, but at the some time, it also has some problems, the system structure and the particularity of the traction load, resulting in the serious unbalanced three-phase power system, and there are a lot of harmonic, reactive and negative sequence currents, and too much the phase problem, hinder the development of the high speed, heavy load, road safety. Cophase power supply technology can eliminate the system unbalance, harmonics, reactive power compensation, the electrified railway power quality problems have been solved, but canceled the electric phase, with high speed, the total amount of electrified railway in the trend of development.This article mainly researches in phase compensation characteristics of the power supply system. Based on Scott wiring cophase power supply system, the equivalent circuit model of the system is deduced. First of all, on the basis of this model are discussed balance compensation device parameter selection problem, and use the analysis software to calculate the system parameter values will effect the compensation effect of the system. The selection of the compensation device control strategy is studied on the compensation characteristic, the influence of using software simulation analysis of the two kinds of corresponding system compensation characteristics under different control mode. Finally calculated the comprehensive compensation current general expressions of cophase power supply system, the influence factors of comprehensive compensation current; On the basis of compensation system of the three-phase imbalance degree are analyzed, and the results are analyzed. On the basis of previous analysis on balance compensation device capacity allocation are discussed, comparative analysis when using different types of transformer as well as the system in different working conditions of the relative compensation capacity. |
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