Speed control of induction motor using composite passivity scheme

Passivity-based control (PBC) or energy shaping method was proposed by Ortega et al. In contrast to existing methods, a distinctive feature of PBC for induction motor (IM) is that the state observer is not necessary. In this paper, PBC scheme is applied to electrical subsystem of cage type induction motor for torque control. For speed control, the proposed scheme is nonlinear proportional-integral (PI) controller. In order to limit the torque instant variation, the given filter and feedback filter are applied to limit the derivate of reference torque. Simulation model of speed control system is established by MATLAB/Simulink. The influence of rotor and stator resistance variation and load torque disturbance is studied. Results show that the proposed composite passivity scheme is successful in speed control of IM and the speed performance is well at low speed. The proposed scheme is suitable for other type motors and power converters.