Dynamic Operation of High Power Synchronous Generator in Asynchronous Regime or encountering Three-Phase Shortcircuit

This paper presents a method of modeling the synchronous machine subjected to transient regimes. Then, the obtained model is utilized to simulate the dynamic behavior of the high power synchronous generator in conditions of asynchronous operation and for sudden three-phase short circuit occurred at the stator winding terminals. The model is based on Park-Blondel equations expressed in canonical form. The equations are built considering the influence of the induced current into the massive rotor of the generator and the nonlinearity of the magnetization characteristic. For the fulfillment of the simulated cases, an implicit Gear algorithm of third order is applied for the integration of the equations. The results obtained through simulations performed using the proposed model, are compared to those obtained running the predefined model offered for the synchronous machine by Simulink package from MATLAB. In both cases identical simulation scenarios are considered.