BS/EN 50641-2020 pdf download.Railway applications — Fixed installations — Requirements for the validation of simulation tools used for the design of electric traction power supply systems.
document are only intended for use in the design of the electric traction power supply system, and hence this document solely considers validation of tools within the TSI energy subsystem for all envisaged railway networks,
This document does not deal with validation of simulation tools by measurement.
This document focuses on the core simulation functions comprising the equations and functions which calculate the mechanical movement of trains and also which calculate the load flow of the electrical traction power supply system. In doing so this document provides all requirements necessary to demonstrate that a simulation tool may be used for the purposes of TSI approval of electric traction power supply systems. Any simulation tool which meets the acceptance requirements of the test cases in this document can be used to determine TSI compatibility for all systems of the same voltage and frequency without any requirement for further validation as part of the TSI assessment process.
This document includes controls for the modification of simulation tools, in particular the limits of applicability of certification when tools are modified. These controls focus on determining whether the core functions of the simulation model are modified.
This document provides only the requirements for demonstration of the algorithms and calculations of core functions. The use of a certified simulation tool in accordance with this document does not, in itself, demonstrate good practice in electric traction power supply system design, neither does it guarantee that the simulation models and data for infrastructure or trains used in the tool are correct for a given application. The choice and application of any models and data, of individual system components, in a design is therefore subject to additional verification processes and not in the Scope of this document. Competent development of design models and full understanding of the limits of design tools remain requirements in any system design. This document does not reduce any element of the need for competent designers to lead the design process.
The test cases and data shown in Clause 6 in this document do not represent an existing network, but these data are used as theoreticalivirtual network only for the purpose of verification of the core functionality.
NOTE A new test case will be drafted considering metro, trarnways and trofleybuses using DC 600 V or DC 750 V. Until this test case is availabte. this document can also be applied to subway, tram and trolley bus systems. This test case will also integrate rail systems using DC 750 V.
Additionally, the application of this document ensures that the output data of different simulation tools are consistent when they are using the same set of input data listed in Clause 6.
This document only applies to the simulation of electric traction power supply systems characteristics at their nominal frequency for AC or DC systems. It does not consider harmonic studies, electrical safety studies (e.g. rail potential), short circuit or electromagnetic compatibility studies over a wide frequency spectrum. This document does not mandate the use of a particular simulation tool in order to validate the design of an electric traction power supply system.
This document does not consider complex models with active components such as static frequency convertors.
5 General
This document considers the acceptance of typical impedance based models of electric traction power supply systems at fundamental frequency or DC. Both lumped and muiticonductor impedance models are covered, but this document does not consider complex models of active components such as a static frequency converter.
The theoretical study of the interactions between the operation of rolling stock and the power supply system by means of computer simulation is generally used to obtain detailed information about a traction power system. This minimizes the costs of live tests, and as a consequence optimizes the investment to be made for a given performance of the electrical railway system.
Depending on the type of the supply system (for example: AC or DC system), the simulation tools require different data and different system descriptions. Therefore the scope of the simulation should be defined in advance, taking account of possible supply systems (see Figure 1). The assessment process of the simulation is in two parts. Firstly, a validation process Is undertaken which compares in a qualitative way specific characteristics of the key simulation output graphs, in order to validate the performance of the simulation at critical events. Secondly, the quantitative verification of the simulation is assessed by comparing key calculated values with those given in this document. The verification process laid out in this document is based on a verification using a defined benchmark example of an electric traction power supply system, and employing a common set of input data incorporating the infrastructure (including station locations, gradient, speed limit), types of train sets and hmetable
NOTE The output data sets have been developed through assessment with several existing simulation tools, currently used in electric traction power supply system design, and which therefore represent a range of differences within core algorithms. The sinulation accuracy of the outputs from these tools were compared, and tolerances applied to cover the range of variation considered reasonable across all tools. The observed variation in these tools has no effect on their applicability for use in TSI assessments, and hence this range of tolerance can be applied to the acceptance of new tools. Annex C gives information on the calculation methodology of tolerances for determination of applied boundary values.BS/EN 50641-2020 pdf download.