Developing a Universal Framework for Modeling DC-Connected Hybrid Real and Virtual Energy Storage Systems

Abstract

A universal modeling framework for hybrid energy storage systems is proposed. The framework can model various energy storage types, both real and virtual. Hybrid systems employ power electronics connected in various topologies to coordinate the operation of multiple storages, which this framework generalizes into a single, switching-averaged model. Multiple common dc/dc converter types are shown to be compatible with this framework. The universal model aims to simplify system design and analysis by recognizing the commonalities of hybrid topologies, converter operation, and storage dynamics to focus on the overall system behavior and energy bandwidth requirements. The generalized parameters can be transformed into real values to continue the system design process. This paper focuses on defining the theory of the universal model. A demonstration of the model shows the framework's validity by comparing simulation results to the proven physics switching models.