Measurement analysis about the impact of electrified railway on grid voltage fluctuations and countermeasure research

As the electrified railway is put into operation, the train has to frequently switch operating conditions among starting, accelerating, idle running and braking. As a result, the traction load would fluctuate greatly, which might cause grid voltage fluctuations and affect the operation of adjacent voltage-sensitive load. In this paper, based on the electrical railway traction load model, simulation analysis of the voltage fluctuation characteristics caused by electrified railway traction load is carried out. Moreover, a large amount of power quality measured data is available for model validation. The dynamic reactive power compensation strategy is proposed. Besides, according to the power quality monitoring data, some power quality problems caused by Long-Hai traction load to some sensitive loads are analyzed in detailed and a quantitative analysis of the impact of Long-hai Electric Railway operating on the grid voltage fluctuation is conducted. Furthermore, the traction load two-phase SVG for power quality compensation is proposed and the corresponding simulation results are given out. Finally, the grid operation mode adjustment suggestion is presented, including cutting sensitive load, the pollution load dispersion, load adjustment in maintenance mode and so forth.