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With the rapid development of electrified railway, electric traction load's proportion in power system load is growing more and more big its impact on power quality is becoming more and more significant. Based on ADPSS, this article build the large-scale power grid real-time simulation model with traction power supply system. The large-scale power grid real-time simulation model can not only simulate in detail the dynamic response characteristics of the traction system, but also can simulate the spread process of phenomena such as phase unbalance, voltage sag, etc.. Using this model, we analyze the phase unbalance and harmonic influence to power quality. The simulation results have important reference on the research of electric traction power supply system under the background of large-scale power grid, at the same time, it provides a new analysis method for the research of power quality.