Nonlinear analysis of an improved swing equation

In this paper, we investigate the properties of an improved swing equation model for synchronous generators. This model is derived by omitting the main simplifying assumption of the conventional swing equation. We carry out a nonlinear analysis for the stability and frequency regulation and provide region of attraction estimates for two scenarios. First we study the case that a synchronous generator is connected to a constant load. Second, we inspect the case of the single machine connected to an infinite bus. Finally, the different behaviors of the conventional and improved swing equations are depicted by simulations