Prystupa D. Electrical parameters identification of induction motors for self-commissioning of vector-controlled drives

The further development has received the method of design induction motors electrical parameters identification algorithms based on a full-order adaptive observer to robustly estimate stator fluxes. The developed and substantiated concept guarantees identification of unknown parameters: rotor resistance, stator (rotor) inductances, and, magnetizing inductance within allowed operating motor modes. Two observers are designed under condition that stator resistance is obtained during preliminary test applying Ohm law. A new method to identify unknown parameters of induction motors during self-commissioning procedure has been proposed as well. To guarantee asymptotic identification, we design adaptive stator current controller based on stator flux observer. Allowed current references guarantee global exponential identification of three induction motor parameters as well as estimation of the stator fluxes in both motionless and rotating rotor operation. Overestimation of the stator fluxes is used to achieve global stability. Additionally, a simplified version of an adaptive current controller without overestimation is presented which guarantees local asymptotic stator current tracking, parameters identification and flux estimation. Intensive experimental comparison studies demonstrate that the proposed schemes guarantee identification and estimation accuracy with fast asymptotic convergence of errors to zero. Developed procedures complement the existing industrial control schemes, and, consistent with vector controls including sensorless algorithms.