Abstract
The result of applying the quantitative approach to the calculation of static stability of the traction power system helped us establish that when a train runs along an actual section there emerge zones with lack of stability in terms of voltage. Exact solution to the task of evaluating the stability is extremely difficult because of the need to compute the nonlinear dependences determining the modes of operation of the traction power system and electric rolling stock. In this work, we constructed a system of four autonomous nonlinear differential equations based on experimental data that simulate the behavior of current and voltage in the contact network. We also calculated stability regions for voltage regulators in the traction network, which stabilize voltage at pantographs of electric rolling stock. The obtained stability regions of voltage regulators made it possible to estimate resource of stability and to find the most robust regulators out of those constructed. The study revealed that the non-linear regulator has better robust properties than the linear one. In this case, stability of the linear regulator is very narrow ‒ Δk=0.000004, which is an order of magnitude lower than for the non-linear regulator. When applying the non-linear regulator, voltage in the contact network stabilizes 3 times faster regardless of the place of its location. Application of the devised approach would make it possible to calculate the stability regions for various schematics of the traction network in the implementation of high-speed motion and to narrow the range of voltage fluctuations. The developed dynamic model of power consumption processes, as well as the voltage regulator, could be used when constructing an intelligent, adaptive traction power system for high-speed motion.
Highlights
Introduction of high-speed motion necessitates the modernization of the traction power supply system in order to ensure the required voltage mode and the level of specific power
The process of consumption of electric energy in the traction network occurs in the presence of heterogeneous perturbations that are nonstationary in character
The pantograph voltage and the consumed power vary over a wide range, which could lead to a loss of stability in the work of the traction electric supply system (TES)
Summary
Introduction of high-speed motion necessitates the modernization of the traction power supply system in order to ensure the required voltage mode and the level of specific power. Under real conditions, controlling influences on the voltage level are executed by the low-cost trivial means for strengthening the traction network: via an increase, the application of parallel connection points These means are not capable of ensuring the required stability of TES in terms of voltage and do not make it possible to adjust voltage in the traction network. When implementing the high-speed motion, there is the task on the development of new approaches to control voltage in the intelligent, self-tuning power supply system of the distributed type, built on the modern element base [2]. There is a need to develop new approaches to ensure the stability of TES in terms of voltage
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