Dual Side Field Oriented Control of Slip Ring Induction Motor

This article presents the dual side field-oriented control (FOC) of the slip ring induction motor (SRIM) where the principle of superposition is applied on the SRIM considering equivalent to two individual virtually controlled induction motor (IM) of the following configurations. In the first configuration, IM has a shorted rotor, and the stator side is used for controlling the motor in the rotor flux reference frame, whereas in the other configuration, IM has a shorted stator, and the rotor side is used for controlling the motor in stator flux reference frame. The merger of both FOC methods is done using the principle of superposition in which, the speed loops of each control scheme are replaced by frequency loops while reference and feedback frequencies of each control are obtained by equally dividing the common speed reference and feedback, respectively. The combination of both controls of IM makes dual side field-oriented control of doubly fed induction motor (DFIM)/ SRIM with common speed reference. Developed power by each side will be equal to the addition of two individual induction machines of the same ratings. This control provides decoupled control of DFIM from both sides of the machine. The simulation and experimental results are presented to verify the claim.