Flatness-Based Control of an Induction Machine Fed via Voltage Source Inverter - Concept, Control Design and Performance Analysis

In this paper a rather new nonlinear control method based on differential flatness is applied to the induction machine fed by a voltage source inverter. The control design is done by designing a feedforward using the flatness of the system to lead it to the reference trajectory. Due to nonidealities an additional stabilizing linear feedback controller is inserted. A speed and rotor flux control with inner current loops is designed and tuned for the induction machine. Simulation results are presented, analyzed and a comparison with the today´s standard control method for ac electrical drives, the field-oriented control, is carried out. Thereby the flatness-based control shows a good performance even though further opportunities for optimizations are left