Active power and MRAS based rotor resistance identification of an IM drive

This paper presents a new method of estimating the rotor resistance of an induction motor. This method is based on model reference adaptive system approach. The rotor resistance changes dramatically with temperature and frequency. The rotor resistance variation has a great influence on the FOC performance of an IM since the actual slip frequency deviates from their set value by rotor resistance variations. Therefore, the compensation of the parameter variation is vital especially in FOC of an IM. Three different methods of rotor resistance estimations, namely, electromagnetic torque equation, reactive power and active power equations, are discussed in this paper. Author proposes the third technique, which is an improvement over the two strategies Although all three schemes estimate the rotor resistance effectively, the proposed technique is superior to others in providing faster estimation approach. Simulation results of all three methods will be provided in order to confirm the superiority of proposed method.