Comparative Mean Control Behaviour without Speed Sensors for Parallel Connected Induction Engines

R. Peña-Eguiluz (Mexico, France), M. Pietrzak-David, B. de Fornel, and V. Riga (France)


Speed sensorless, multi-converter multi-machine system, railway traction, simulation, and estimation.


A comparison between two sensorless four-speed strategies applied to a mean drive control structure for parallel connected dual induction engines is presented in this paper. All system behaviour strategies are compared versus internal engine parameter variations and external mechanical perturbations. A speed sensor control is introduced as a complementary strategy in order to define the reference system behaviour. The studied system presents two important interactions. On the one hand, an electric coupling is established by the common static voltage inverter, which supplies both engines. On the other hand, a mechanical coupling is imposed by the common load on the engines. The system, which has been modelled using the solver SABER from Avant! Corporation, represents a railway traction locomotive.

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