| At present,the power supply mode adopted by the electrified railway is AC,single phase and commutation.However,voltage phase of different power supply intervals are different.Therefore,there is passing neutral section condition,when electrified trains are running.When electrified trains pass through an area without electricity,it is easy to generate overvoltage due to the complex electrical transient process.In serious cases,it may lead to breakdown of discharge gap of electrified trains and tripping of traction substation.Therefore,studying how to restrain the overvoltage which are generated by electrified trains,when they pass the neutral section is of great significance for the safe operation of electrified railway.First of all,this paper introduced the realization form of neutral section and the frequently used passing neutral section modes in detail,and expounds the technical characteristics and application scope of different passing neutral section modes.Analyze the causes of transient overvoltage when electrified trains are passing neutral section,establish the equivalent electrical model of ground auto-passing neutral section,which provides theoretical support for overvoltage suppression and verification.Secondly,aiming at the problem of overvoltage which are producedduring the electrified trains are passing neutral section.this paper use Matlab/Simulink to build the model of neutral section and electrified train.Simulate each phase of electrified train passing through the ground auto-passing neutral section.Finally,it is proposed to suppress overvoltage by putting in RC and improved RLC,for solve the problem of the two schemes are difficult to be determined,this paper provides a parameter selection by simulation.In this way,the problem of harmonic and overvoltage which are produced during electrified train are passing neutral section do harm to traction power supply system is solved.The results of simulation test verify that the theoretical analysis is correct and effective. |
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