Consideration of Effect of Excitation Power of Self-Excitation AVR on Synchronous Stability

Along with the increase of photovoltaics capacities in power systems, several thermal generation units must be stopped to maintain power supply-demand balance. As a result, the synchronous stability could be negatively affected by the lower system inertia. Hence, it is necessary to more accurately evaluate the stability of each generator. Therefore, phenomena which have been neglected due to the increase of calculation load in the past required to be considered in stability analysis. The focus of this study is the effect of the excitation power of self-excitation AVR on synchronous stability. The effect has been neglected in conventional stability analyses. However, in actual power systems, exciters of self-excitation AVRs are connected to generator terminals and exchange the excitation power with the power systems. In this study, the effect of the excitation power on the accuracy of stability analyses was evaluated using a linearized model and numerical simulations.