A study on modeling and simulation of DC railroad system

To apply characteristics of railroad system on EMTDC simulation, variable feeder impedance model and railroad vehicle model are developed. By using developed models, test system is constructed and simulation is performed. The input data on EMTDC simulation is from TPS, and TPS simulation input data is from real railroad system Apgujung-Sinsa section. TPS location output data is transformed to feeder impedance data. By applying impedance and consumed data, railroad on standard operation is simulated. Stable operation criteria is that each substations and vehicles voltage should be higher than standard limit voltage, 1100 and 900 [V]. Through case simulation, 3 substations and 4 vehicles voltage are measured and indicated minimum and maximum voltage. Under standard operating condition, it is verified that railroad system is not out of limit. The main object of this developed DC railroad simulator is `verification' before system construction or operating schedule preparation. By this simulator, we can determine the distance between substation, two vehicles time interval, the number of vehicles between substations, etc. Moreover, the simulator helps the research on DC railroad system activated.