[Show abstract][Hide abstract] ABSTRACT: In electrified railways, the traction power systems carry power to trains and their reliability is vital to the quality of train services. There are many components in the traction power system, from interface with utility distribution network to contacts with trains, and they are physically located along the rail line. Subject to usage, environment, and ageing, conditions of components deteriorate with time. Regular maintenance has to be carried out to restore their conditions and prevent them from failure. However, the decisions on the suitable length of maintenance intervals often lead railway operators to the dilemma of minimizing both risk of failure and operation cost. On the basis of a stochastic lifetime model, this article presents a generic software evaluation tool that enables the operators to manage risk of failure and cost quantitatively in order to match their preferred levels of service quality. The lifetime model includes the effects of condition restoration because of maintenance of regular intervals and ageing acceleration because of electrical stress from traffic demands. Examples of simulation results are given to illustrate the applicability of this lifetime model.
Full-text · Article · Jun 2006 · Proceedings of the Institution of Mechanical Engineers Part F Journal of Rail and Rapid Transit
[Show abstract][Hide abstract] ABSTRACT: System analysis within the traction power system is vital to the design and operation of an electrified railway. Loads in traction power systems are often characterised by their mobility, wide range of power variations, regeneration and service dependence. In addition, the feeding systems may take different forms in AC electrified railways. Comprehensive system studies are usually carried out by computer simulation. A number of traction power simulators have been available and they allow calculation of electrical interaction among trains and deterministic solutions of the power network. In the paper, a different approach is presented to enable load-flow analysis on various feeding systems and service demands in AC railways by adopting probabilistic techniques. It is intended to provide a different viewpoint to the load condition. Simulation results are given to verify the probabilistic-load-flow models.
Preview · Article · Aug 2005 · IEE Proceedings - Electric Power Applications
[Show abstract][Hide abstract] ABSTRACT: The objective of this paper is to review the development of a
number of approaches to computer simulation models of railway systems.
Attention is, in particular, given to models of train movement, power
supply systems and traction drives. These models have been successfully
used to enable various `what-if' issues to be resolved effectively in a
wide range of applications, such as speed profiles, energy consumption,
run times etc