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Use of a HIL railway traction simulator for low frequency network stability studies

As a result of the introduction of modern traction vehicles, equipped with active front end rectifiers, and the increase in railway traffic, several cases of instability have been observed in the AC railway networks. These instabilities can lead to train power supply shut down or equipment damages. The measurement of the admittance is required to perform the network stability study. Nevertheless, since this would require a large and expensive test means, it is preferable to use the simulator. The first part of this paper develops the admittance measurement of a train in the Alstom HIL (Hardware In the Loop) simulator (SITRA™). Considering a given network impedance, the determined input admittance will then be used to study the stability of the power system. The last part provides time domain simulation to demonstrate the coherence between the frequency domain analysis and the time domain response.