A special Multi-machine Multi-converter System (MMS) structure is presented in this paper. It is a mono-inverter dual motor structure specially designed to be applied in railway traction. In traction applications the necessity to provide an excellent torque response is indispensable. As a consequence, in order to control the torque production of both motors in this kind of structures, special methodologies known as co-operative control structures based in the classical Field Oriented Control (FOC) can be applied. Mono-inverter dual induction motor drive system structure enhances the locomotive behaviour, reducing undesirable effects produced by external or by internal perturbations. The obtained system behaviour is compared with the classical locomotive drive control system operation. An industrial locomotive manufacturer has confirmed the simulated model. Obtained results are applied to analyse the system behaviour of the two considered control methods, taking into account four characteristic perturbations in this kind of power traction systems.
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