Investigation of a reduced order model for induction machine dynamic studies

In this paper, a reduced order model of an induction machine, developed in reference [1] is investigated using digital simulation and eigenvalue studies. The model is compared with the complete representation by simulating the non-linear equations of both for the same dynamic situation. This study includes the transient load modeling of a single machine and the performance of the model in the case of interconnected machines. It is observed that the results obtained using the simplified model compare well with those obtained using the complete model and that significant saving in computation time results for the case of interconnected machines. Also a linearized version of the model is used for stability studies using eigenvalue analysis. Here again, the stability for small perturbations of a single machine and a system of interconnected machines is investigated using the reduced order and complete models. The reduced order model is found to give only approximate results regarding stability in a limited range of operating conditions. It appears that the reduced order model, if used in its non-linear form would be effective in transient stability studies of large-scale systems.