Influence Mechanism and Suppression Methodologies of the Overvoltage of High-speed Railway on the Vehicle-mounted Traction Power Supply System:Systematic Review
In order to pursue higher traction velocity and stronger loading capacity,the power capacity of the on-board traction power supply system of high-speed trains is constantly enhanced.The existing traction power supply system with the critical equipment needs to cope with higher frequency and greater amplitude of overvoltage impulse.How to maintain the safe and reliable operation of the traction system under high-speed condition is a vital technical challenge for the design of high-speed trains today.Herein,the typical faults of the traction power supply system caused by overvoltage are investigated in detail,as the types of overvoltage with corresponding characteristics occurring in high-speed trains are summarized.At present,the mainstreamed traction power supply modes contain the direct power supply mode with reflux line and the automatic transformer(AT)power supply mode,both of which are single-phase AC power supply systems.In order to ensure the balance of three-phase load and prevent the generation of negative sequence current in the system,adjacent power supply arms that transmit out of phase current are isolated by insulating phase-splitting section.The vehicle-mounted vacuum circuit breaker(VCB)needs to be operated when the train passes through the phase-splitting section,as severe overvoltage impact tends to occur during the switching-on and switching-off processes.In addition,the'pantograph-catenary'offline arc and the'wheel-rail'rolling arc occur frequently,also accompanied by overvoltage impulse.From current research on traction power supply system simulation models,we explore overvoltage generation and propagation,summarize influencing factors and suppression measures.Future focus includes'pantograph-catenary'and'wheel-rail'overvoltage impact,overvoltage propagation in'multiple-trains sharing'and'carriage connection'scenarios,and prospects for a'source-path-terminal'suppression method.
high speed railwayovervoltagearc of vacuum breakerarc of'pantograph-catenary'offlinerolling arc of'wheel-rail'
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