Modelica Implementation of Field-oriented Controlled 3-phase Induction Machine Drive

This paper focuses on the modeling of a cage induction machine drive under direct-field oriented control, also referred to as flux-vector control. The interest is to create a behavioral model of an induction machine drive under field orientation for sytem simulations since field-oriented control is now commonplace in commerical adjustable speed drives. First, the 3phase induction machine model is developed. Then, the field orientation requirements are applied to this model and a voltage source inverter is used to emulate a controlled current source. Rotor field orientation is used because of fewer limitations than other fieldorientation approaches. The inverter is assumed to provide the desired phase currents instantenously and ripple free at some efficiency. Finally, these three components of the overall drive sytem, machine model, field orientation and inverter power supply, are combined together in a block using the Modelica language and simultaneously solved using the Dymola user interface.