Direct Torque Control Model of an Induction Motor using ATPDraw and MODELS

This paper presents the model of a Direct Torque Control (DTC) of the Voltage Behind Reactance (VBR) model of the induction motor developed using ATPDraw and MODELS tools. This controller is capable of driving the motor at a electric torque and stator leakage flux references. The DTC is obtained using the classic space vector table and the main contribution of this work is performing the model using ATPDraw and MODELS. This model can be useful for studies of electric vehicles traction and wind energy source generation systems (WECS). The DTC controller was implemented using the MODELS programming tool, included in EMTP-ATP and ATPDraw programs. In this model, the space vector of voltages produced by the inverter is chosen from the classic table and supplied to the controller, depending on the zone where the space vector of the machine's stator flux leakage is located and the corresponding errors of the instantaneous flux magnitude and electric torque with respect to its respective references. The space vector voltage is calculated at each switching instant, defined by the operating frequency of the inverter bridge. The VBR model of the induction machine was selected to be easily integrated into the electrical power circuit using ATPDraw as the programming tool. The results obtained show a practically instantaneous response to variations of the torque and flux references and the implementation of this strategy in ATPDraw and MODELS allow the use of these tools in detailed studies of power electronics and drives.