A Multibeam Model of a System of the AC Railway External Power Supply

Abstract

AbstractProblems of operational control of traction network modes should be resolved taking into account the characteristics of the power supply system (PSS). The problem of correct power supply system modeling becomes particularly relevant in modern conditions, which is caused by two factors. The first one is related to the transition of the electric power industry to a new technological platform based on the use of smart electric grids, whose functioning requires the development of adequate methods of computer modeling. The second aspect is determined by the organization of the movement of heavy and high-speed trains, which will create significant peaks of electric traction loads. At the same time, the use of insufficiently adequate models of the external network will result in unacceptable errors in modeling the modes of traction power supply systems. The article proposes a model of an external power supply system of an AC railway, built on the basis of a multibeam scheme using synchronized vector measurements of PMU WAMS. The essential difference of the proposed model from the traditional beam REI models is the use of phase coordinates and the original order of constructing the equivalent. Computer modeling has shown a high accuracy of calculating the modes of traction power supply systems based on the proposed model of the electric power supply system. The maximum error for the high-voltage network was 0.82%, the error in determining the voltage on the electric locomotive pantograph did not exceed 0.27%.KeywordsExternal power supply system of AC railwaysNodal equivalent model