Effect Of High Speed Railway Electric Integrated Grounding On Geo-magnetically Induced Currents Of Track Circuit

With the rapid development of high-speed railway in our country,how to make the high-speed,stable and efficient operation of high-speed railway becomes more and more important.The geomagnetic induced currents caused by the geomagnetic disturbances caused by solar activity have become a new topic.This paper analyzes the high iron electrical power supply system in 4 power supply modes(back to streamline,not to streamline,autotransformer,suction flow transformer)as well as the advantages and disadvantages of the four kinds of impedance coupling model,and puts forward some methods to reduce the rail potential,and in theory on the rail.The track circuit equipment,and then through the working principle of track circuit is discussed and the formation of geo-magnetically induced current flow path in the system,proved that the size and the calculation formula of the geomagnetic induction electric field due to the strong storm in the power supply system,and obtained the calculating formula of the geomagnetic induced current in track circuit.Then the simulation model and the simulation model of the track circuit are set up in the Hebi area of Henan as the investigation point.In MATLAB/simulink,simulation results show that the different connection mode of the integrated grounding system of high-speed rail is how to influence the simulation of geo-magnetically induced currents,And through the cross track,adding protection line or centralized grounding to reduce the current of the magnetic induction.the geomagnetic induced current in the system in order to form in the DC track circuit,simulation of a series capacitor in the transformer of the grounding line to geomagnetic annihilation the induced current from the root of existence.