Analysis of adverse effects on the public power grid brought by traction power-supply system

With the rapidly developing of electrified railways, the adverse effects on the public power grid brought by traction power-supply system have been increasingly taken into account by railway and electricity department. In order to analyze the harmonics influence caused by traction power-supply system, the models based on PSCAD/EMTDC of typical traction power-supply system and public power grid have been established. Impacts of the harmonics and negative sequence under different operating modes and different wiring traction transformers have been detailed analysis by the model based on PSCAD. The comprehensive performance of Scott connection traction transformer is very well. The total harmonic distortions and the non-equilibriums among three phase voltages are less than other three traction transformers. The dynamic process during electric locomotives launch into or drop out has been simulated. The effects on the public power grid caused by traction load have been analyzed. The result of simulation analysis is credible and valuable in practical project.