Abstract

A rotor field quasi-oriented control algorithm for drive systems equipped with a low cost DSP system has been implemented and experimentally validated in this paper. The system is designed for induction motor traction systems. The control algorithm implementation was done for a dSPACE DS1103 prototyping board in the Matlab Simulink environment. The control algorithm principle is based on the assumption that the current system is oriented by the rotor flux and the real flux follows the imposed value. Therefore, the rotor flux estimation is no longer necessary as well as the flux control loop. This makes the control algorithm suitable for low cost industrial DSP applications. The drawback is given by the fact that the current projections on the dq axes cannot be regulated, the current control being done by means of the current phasor magnitude. The control system implementation was validated with  good results, in terms of current and speed regulation especially at variable mechanical load (such as track joints or switches), making this method suitable not only for low cost traction systems, but especially for railway vehicles.

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