High performance sensorless VSI fed Induction Motor drive using combined vector control

Speed sensorless vector control is the nascent trend in variable speed industrial AC drives due to its substantial energy efficiency and robustness. The present day, independent flux and/or torque vector control of inverter fed Induction Motor (IM) need improvement in dynamic performance interms of ripple free torque and smooth flux operation. In this project a new scheme combining both flux and torque control is developed effectively and its performance during starting, steady state operation and dynamic load changing conditions is analysed by dynamic modeling of a typical three level Voltage Source Inverter (VSI) fed induction motor with an improved in Flux-Torque-Speed observer by software simulation. It is proved to be the smart alternative with performance enhancement while maintaining the drive robustness and simplicity.