Parameter Estimation Method for Induction Machines Using the Instantaneous Impedance During a Dynamic Start-Up

In this work a parameter estimation method of the induction machine model based on the instantaneous impedance is presented. The proposed method is based on instantaneous voltage and current measurements during start-up of the induction motor at rated voltage. The proposed parameter estimation method uses an space vector description of the transient machine equations, referred to the stator frame of reference, during the dynamic conditions presents at start-up. The method adjusts the dynamic model parameters using an error function obtained by comparing the instantaneous impedance obtained from the space vector representation of the machine and the corresponding obtained from the measured variables at start-up. The method gives a very precise off-line parameter estimation. The solution is obtained using a non-linear regression method that can be used to improve the control behavior in several predictive DTC strategies.