What is it about?

This paper presents a methodology to consider the impedance of a grid in power hardware in the loop (PHIL) experiments to validate power converter control in presence of harmonics or resonances in the network impedance. As the phenomena to emulate are in a large frequency range, the skin effect in conductors has to be taken into account. A procedure is developed to model the network. Then, the model is simplified to reduce the computation requirements and discretised for real-time implementation. The proposed method has been applied to analyse the harmonic interactions due to on-board converters running on a 25 kV-50 Hz railway infrastructure for frequencies from 0 to 5 kHz. The model is computed in Matlab-Simulink, a SpeedGoat Performance Machine and a linear power supply are used for a real time implementation. The converter under test and the test bench are presented. Some experimental results are presented, showing the feasibility and the usefulness of the proposed approach.

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Why is it important?

An AC railway infrastructure model has been emulated for power-hardware-in-the-loop testings. The interactions between a mock-up of an on-board converter and a simulated railway infrastructure have been analysed. The amplifications of harmonics injected into the virtual catenary by the converter mock-up have been linked to the sector structure and the train position on the infrastructure.

Perspectives

This methodology - emulation of an infrastructure to supply a mock-up - has been developed and verified for a railway system. However, it can be extended to other types of networks and converters, such as three-phase network or offshore wind farm collector.

Caroline Stackler
SuperGrid Institute

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This page is a summary of: 25 kV-50 Hz railway power supply system emulation for Power-Hardware-in-the-Loop testings, IET Electrical Systems in Transportation, January 2019, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/iet-est.2018.5011.
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