Impedance-Based Stability Analysis of Systems with the Dominant Presence of Distributed Power Sources
Original version
10.23919/IPEC-Himeji2022-ECCE53331.2022.9806890Abstract
In recently developed electric power systems, numerous distributed generators (DGs) are connected via power electronic devices. Because these devices can generate harmonics and nonlinear distortion, traditional model-based approaches can become too complex to accurately analyze the dynamic responses of DGs. Stability analysis methods based on impedance scanning provide a practical alternative to the linear model approximation method; they directly measure the impedance of the source-load subsystems and evaluate the stability. However, most previous research focused on the characteristics of individual grid-connected devices and the stability of the microgrid (MG). In this study, the dynamic characteristics of a large-scale power system with intermittencies caused by the introduction of a large number of DGs with advanced inverter controls were analyzed through impedance-based analysis. The effect of the capacitance of passive filters and transmission lines in advanced DGs on stability was also investigated.