Estimação dinâmica de parâmetros e velocidade da máquina assíncrona.

Abstract

This work aims to contribute to the study of the problem of parameters and speed estimation for asynchronous machines. The estimation models are derived from the dynamical machine equations such that only stator quantities are required. The discrete time version of the estimation models employs the delta operator in order to simplify the determination of the continuous time parameters. In the proposed approach one needs the time derivatives of the measured quantities. These derivatives are obtained using discrete linear filtering techniques. The proposed models are studied via digital simulation where the influence of the supply voltage, the machine speed, the sampling period, and the filter design is evaluated. The different estimation models are compared through their estimation errors, variances, and the value of the cost function. The estimation models are also evaluated under experimental conditions quite similar to those considered in the simulation studies. The obtained results demonstrate the correctness of the proposed methodology.