Modeling And Simulation For Traction Power Supply System Of High-Speed Railways Based On Rtds

Being the power source of high-speed EMU(Electric Multiple Units), the traction power supply system plays an important role in the working of the high-speed railways. Simulation turns to be a crucial means of studying traction power supply system. Traction power supply system model which is established in the RTDS can be applied to test the relay protection device in the closed loop. Through analyzing the causes of maloperation and malfunction, it can improve and perfect the protection principle and the algorithm of the relay protection device so that it can shorten the research and development cycle of the new device. This paper concentrates on the traction power supply system of the high-speed railways under the AT power supply system. Based on the six-conductor equivalent model, the developer uses the custom model function of the RTDS to define the Single-line AT traction network model and double-track AT traction network model with the C language in the C Builder. The AT traction network model defined by developer possesses advantages such as easy modification, high operability, and wide-scale application. Users simply need to choose the wire type on the basis of the actual conditions of the simulation system and enter the spatial position value of the wires, which avoids the repeated computation of the electrical parameters and improves the simulation efficiency.With the custom traction network model and the simulation model in the component library, the author builds the model of the single and double-track AT traction power supply system, and simulates the traction transformer faults and the traction network faults. By analyzing the traction network’s current distribution and the characteristic curve of the short-circuit impedance in the fault condition, the validity and the availability of the model defined by the developer are verified.At last, the developer writes the script files in the RUNTIME module of the simulation cases, take control of and switch freely among the conditions such as fault location, transition resistance, fault type, which successfully implement automation test of the protection device.