Resonance assessment in electrified railway systems using comprehensive model of train and overhead catenary system

Due to the complex and nonlinear nature of electric railway supply system the system is a good candidate for the resonance occurrence. Resonance can boost some voltage or current harmonic components and may cause damage to the network equipment. Therefore resonance assessment and finding the resonance frequencies in the electrified railway system is important. In order to evaluate frequency response of the comprehensive modeling of entire system is required. In this paper an electromagnetic model of overhead catenary system for considering the mutual coupling between the conductors and running rails is utilized and an electro-mechanical model using the motion equation and internal circuits of the train is presented. After comprehensive modeling of the electric train and supply system, in order to assess the resonance phenomena simulation studies for a 2×25 kV, 50 Hz electrified railway system have been made in MATLAB/Simulink. The frequency response of the system is investigated in different scenarios corresponding to the number and location of trains and system configuration. The results show that system resonance frequencies and their severity vary with the change in system configuration.