Voltage Survivability in DC Micro-Grid Systems

OpenAlex · English

Micro-grid systems (dc, ac, and hybrid) are flexible and reliable platforms for integrating distributed energy resources (DERs) and supplying different loads. In general, a micro-grid system can experience various types of dynamic events due to load-side and/or DER activities. When dc micro-grid systems are considered, dynamic events can pose serious challenges to the voltage stability and micro-grid system functionality. This paper presents the analysis, development, and testing of a voltage-survivability based method for modeling the impacts of dynamic events on the voltage stability in a dc micro-grid system. The presented method is structured using an index ΓV, which is defined in terms of the difference in the active power injection before and after a dynamic event. The index ΓVhas boundary values to differentiate between survivable and non-survivable dynamic events. The voltage-survivability based method is implemented and tested for a 10-bus dc micro-grid system under various types of dynamic events. Test results demonstrate the ability of voltage survivability-based method to accurately model and quantify possible impacts of dynamic events on the voltage stability in dc micro-grid systems.