Automated operation and artificial intelligence technology have become essential for ensuring the safety, efficiency, and punctuality of railways, with applications such as ATO (Automatic Train Operation). In this stu...Automated operation and artificial intelligence technology have become essential for ensuring the safety, efficiency, and punctuality of railways, with applications such as ATO (Automatic Train Operation). In this study, the authors propose a method to efficiently simulate the kinematic characteristics of railroad vehicles depending on their speed zone. They utilized the function overloading function supported by a programming language and applied the fourth-order Lunge-Kutta method for dynamic simulation. By constructing an object model, the authors calculated vehicle characteristics and TPS and compared them with actual values, verifying that the developed model represents the real-life vehicle characteristics accurately. The study highlights potential improvements in automated driving and energy consumption optimization in the railway industry.展开更多
A study is under way to apply the main power conversion element of the C/I device,the propulsion control unit of variable voltage and variable frequency(VVVF),to the electric vehicle by changing it from gate turn off ...A study is under way to apply the main power conversion element of the C/I device,the propulsion control unit of variable voltage and variable frequency(VVVF),to the electric vehicle by changing it from gate turn off thyristor(GTO)to insulated gate bipolar transistor(IGBT).In an early study,a combination of GTO and IGBT was tested on electric vehicles.The IGBT method was applied to 1 coach and the GTO method was applied to the remaining coaches.As a result of the test,a lack of traction force occurred due to an imbalance in output current.This phenomenon was determined to be caused by differences in the operational characteristics of the two types of power devices.This is due to the different response performance of the IGBT inverter vehicle and switching signal of the controller that drives the existing GTO inverter.When two power devices are used in a train,it is necessary to match the response performance between coaches.Interface board was manufactured and installed on the coach with IGBT and tested.The interface board is designed to have the characteristics of matching signals between the controller and the gate drive unit(GDU).As a result,the same switching response performance was achieved between GTO type and IGBT type coaches.The performance of using a mix of two power devices was verified.Therefore,normal driving performance and comfortable ride were maintained during the operation of the train.展开更多
This paper,the kinetic equation,traction force,and braking force for railway trains are reviewed.In addition,the driving characteristics are interpreted as to how the power of the electric vehicle relates to the weigh...This paper,the kinetic equation,traction force,and braking force for railway trains are reviewed.In addition,the driving characteristics are interpreted as to how the power of the electric vehicle relates to the weight,speed,track curve,and track gradient of the electric vehicle.The driving characteristics of these trains are analyzed through PSCAD/EMTDC(power systems computer aided design/electromagnetic transients including DC)modeling.展开更多
In this paper,a new type of automatic transmitter(AT)is proposed to properly adjust the voltage of the train without installing additional equipment.The proposed tap-changing AT is expected to raise the voltage betwee...In this paper,a new type of automatic transmitter(AT)is proposed to properly adjust the voltage of the train without installing additional equipment.The proposed tap-changing AT is expected to raise the voltage between catenary and rail by regulating the turn-ratio between primary and secondary winding according to catenary voltage and verified its effects through the multi ports network analysis technique modeling of it.Through the simulation and analysis of the electric railway systems,it is shown that it can secure the load capacity and solve the large voltage drop problem by raising the voltage across railway vehicles back to the normal voltage level.展开更多
文摘Automated operation and artificial intelligence technology have become essential for ensuring the safety, efficiency, and punctuality of railways, with applications such as ATO (Automatic Train Operation). In this study, the authors propose a method to efficiently simulate the kinematic characteristics of railroad vehicles depending on their speed zone. They utilized the function overloading function supported by a programming language and applied the fourth-order Lunge-Kutta method for dynamic simulation. By constructing an object model, the authors calculated vehicle characteristics and TPS and compared them with actual values, verifying that the developed model represents the real-life vehicle characteristics accurately. The study highlights potential improvements in automated driving and energy consumption optimization in the railway industry.
基金This study was conducted by the Ministry of Land,Infrastructure and Transport’s Research Project on Railway Technology-Projects(20RTRP-C148759-03).
文摘A study is under way to apply the main power conversion element of the C/I device,the propulsion control unit of variable voltage and variable frequency(VVVF),to the electric vehicle by changing it from gate turn off thyristor(GTO)to insulated gate bipolar transistor(IGBT).In an early study,a combination of GTO and IGBT was tested on electric vehicles.The IGBT method was applied to 1 coach and the GTO method was applied to the remaining coaches.As a result of the test,a lack of traction force occurred due to an imbalance in output current.This phenomenon was determined to be caused by differences in the operational characteristics of the two types of power devices.This is due to the different response performance of the IGBT inverter vehicle and switching signal of the controller that drives the existing GTO inverter.When two power devices are used in a train,it is necessary to match the response performance between coaches.Interface board was manufactured and installed on the coach with IGBT and tested.The interface board is designed to have the characteristics of matching signals between the controller and the gate drive unit(GDU).As a result,the same switching response performance was achieved between GTO type and IGBT type coaches.The performance of using a mix of two power devices was verified.Therefore,normal driving performance and comfortable ride were maintained during the operation of the train.
基金supported by the Korea Institute of Energy Technology Evaluation and Planning(KETEP)and the Ministry of Trade,Industry&Energy(MOTIE)of the Republic of Korea(No.20225500000110).
文摘This paper,the kinetic equation,traction force,and braking force for railway trains are reviewed.In addition,the driving characteristics are interpreted as to how the power of the electric vehicle relates to the weight,speed,track curve,and track gradient of the electric vehicle.The driving characteristics of these trains are analyzed through PSCAD/EMTDC(power systems computer aided design/electromagnetic transients including DC)modeling.
基金KETEP(Korea Institute of Energy Technology Evaluation and Planning)grant funded by the Korea government(MOTIE)(No.20191210301890)。
文摘In this paper,a new type of automatic transmitter(AT)is proposed to properly adjust the voltage of the train without installing additional equipment.The proposed tap-changing AT is expected to raise the voltage between catenary and rail by regulating the turn-ratio between primary and secondary winding according to catenary voltage and verified its effects through the multi ports network analysis technique modeling of it.Through the simulation and analysis of the electric railway systems,it is shown that it can secure the load capacity and solve the large voltage drop problem by raising the voltage across railway vehicles back to the normal voltage level.
