PARAMETER SENSITIVITY OF MRAC MODELS EMPLOYED IN IFO-CONTROLLED AC MOTOR DRIVE

An investigation of the parameter sensitivities of the d-axis voltage, q-axis voltage, and the reactive power models used in model reference adaptive control (MRAC) strategy far tuning the indirect field-orient ed (IFO) controller is presented. These reference models are derived f rom the dynamic model of the machine under the assumption that the IFO control conditions are valid. In this paper, the machine has been con sidered to operate under variable speed and load conditions. To improv e the robustness of the MRAC strategy, a cascade parameter estimation technique has been used to track tile variations in r(s) and sigma l(s ). The experimental results obtained with the proposed estimation tech nique, as well as with the MRAC strategy, are presented.