Reduction of load model based on perturbation method

This paper describes the concept of the multi-time scales in math and derives a integrated typical model that represented by the induction motor. Then the system is separated to some subsystems in different scales for the purpose of reducing the order of the model. Finally the perturbed models for induction motor are developed, implemented and tested on the one-machine infinite-bus system. The dynamic performances of the perturbed models are compared with the full models as well as the simple models which completely neglect fast transients during simulations. From the simulation results it is seen that the perturbation technique is reasonable.