Sensitivity Analysis of Characteristic Parameters of Railway Electric Traction System

Abstract

The modal analysis, which decouples the contact wire and rail track conductors, is used to develop an integrated model of single rail track and contact wire. The characteristic impedance and propagation constant matrices of integrated model have been computed. The authors have studied effects of various parameters of interest on characteristic impedance and propagation constant using sensitivity analysis. The sensitivity functions of series impedance and shunt admittance related to contact wire and catenary have been developed and validated in this paper.

Digital Model of Railway Electric Traction Lines

“…The sensitivity of these parameters with respect to frequency is determined in frequency domain and the results are discretised to evaluate the normalized sensitivity as given in Table 4. These sensitivity functions in z-domain are then compared with the sensitivity functions of analog model [1]. From the Table 3, it is observed that as the sampling time is reduced, more time instants are required for the digital model to approach that of analog model [1], which is the expected behavior.…”

“…These sensitivity functions in z-domain are then compared with the sensitivity functions of analog model [1]. From the Table 3, it is observed that as the sampling time is reduced, more time instants are required for the digital model to approach that of analog model [1], which is the expected behavior. From the Table 4, it is found that the digital sensitivity of characteristic impedance with respect to frequency is approaching the analog sensitivity at smaller sampling time.…”

“…The analysis and design of power and signaling system of railway electric traction system needs mathematical model of the system. The authors have used the multi-conductor transmission line (MTL) theory to develop the mathematical model of the electric traction system and to compute the characteristic impedance and propagation constant of this system [1,2,5]. In a railway traction system, the individual lines corresponds to each running rail/rail track conductor and the power conductor or overhead catenary are as shown in Fig.…”

“…The authors in this paper have developed the digital model of characteristic impedance and propagation constant of contact wire and rail track conductor and carried out the sensitivity analysis of these discretised parameters with respect to frequency first time in the literature. The analog sensitivity analysis with respect to parameters of interest is presented by the authors [1].…”

Electrical prototype model of pantograph-catenary system

“…In many countries, 25kV, 50Hz single phase ac supply is fed to the electric loco which is stepped down to different voltage levels by the loco transformer for various functions [18]. One of the winding of loco transformer is used to feed the traction drive through converter-inverter system.…”