Presently

the Qinghai-Tibet Railway has already been open to traffic

but there are still some problems on its transmission system.The voltage of 35 kV transmission line on Tibet section fluctuates greatly due to long distance

and at the same time

harmonic

overvoltage and voltage flicker also happen

among which voltage fluctuation and overvoltage have a great influence on its normal operation.In view of the reliability and stability of power supply which is necessary for the normal operation of Qinghai-Tibet Railway

the possible suggestions on dynamic reactive power compensation device are presented based on the analysis of existing problems as mentioned above.Meanwhile

its feasibility is also testified through simulation.