New Achievements in the Rotor Field-Oriented Control for Autonomous Locomotives : Part 1: System synthesis and theoretical investigations

This paper is focused on the use of indirect rotor field-oriented control for an asynchronous motor used in the traction system of an autonomous locomotive. The equations of operation are first introduced. The control scheme is illustrated and discussed in the complex variant of voltage control, as well as in the simpler variant of current control. For the second control variant, the design of speed and rotor flux controllers is presented. To validate the rotor flux estimation block, the influence of the waveform of the supply voltage and sampling time on the flux calculation is determined. Then, the performance of the control system for two prescribed speeds (twenty percent of rated speed and by fifty percent higher than the rated speed) is analyzed. The control system and algorithm are validated by the obtained results.