Online Rotor Resistance Adaptation Of Induction Motor Drive

In this paper an adaptive control systems scheme is used to update the rotor resistance of an induction motor drive. Rotor resistance of the induction motor drive is dependent on the temperature where it is installed for one Induced Draft Fan (I.D Fan) in one of the 500 MW generating thermal power plant. The rotor resistance adaptation is of induction motor drive is achieved through Indirect Field Oriented. The desired value of the rotor flux along the q axis should ideally be zero. This condition acts as a reference model for the proposed Adaptive Control scheme. Inductance does not change with the temperature. Therefore, the only parameter which changes with the temperature in the adjustable model is the rotor resistance. This resistance is adjusted such that the flux along the q axis is driven to zero. The proposed method effectively adjusts the rotor resistance on-line and keeps the machine field oriented. The effectiveness of the proposed scheme is tested through simulation and is experimentally verified.