Survivability Analysis of Hybrid Micro-Grid Systems

Hybrid Micro-grid systems have been developed as flexible and reliable platforms for integrating dc and ac distributed energy resources (DERs) to supply different load types. The structure and components of a hybrid micro-grid system makes it vulnerable to various types of dynamic events, which can take place in its dc and/or ac components. Such dynamic events can present major challenges for the stability and functionality of a hybrid micro-grid system. This paper presents the survivability analysis as a tool to model the impacts of dynamic events on a hybrid micro-grid system. The presented tool is based on the use of a survivability index Γ that is defined in terms of the difference in the bus power injections before and after a dynamic event. The index Γ has boundary values to differentiate between survivable and non-survivable dynamic events in a hybrid micro-grid system. The survivability analysis is implemented and tested for a hybrid micro-grid system under various types of dynamic events. Test results demonstrate the ability of the survivability analysis to accurately model and quantify impacts of dynamic events on a hybrid micro-grid system.