Field-oriented control of current-source inverter fed high speed induction machines using steady-state stator voltages

One well suited solution to overcome the problems of voltage-source-fed high speed induction machines such as stress of the stator winding insulation and overheating of the rotor is the use of a current-source inverter, since the machine is then fed by almost sinusoidal currents and voltages. However, such drive systems are only efficient if first of all the DC-link current is adjusted to its lowest possible magnitude and secondly - which is the same with directly-fed machines - the value of the rotor resistance or the magnetizing current respectively is assumed correctly. This paper proposes a new DC-link current set value assignment and a method to improve the models for magnetizing current and field angle by using steady-state stator voltages. Measurements taken on a model plant with an output power of 35 kW and a nominal speed of 30000 min^-1 prove the feasibility of the presented methods