The Combination of Single- and Three-Phase Inverters into a Hybrid Energy Storage System

The concept of a hybrid energy storage system for small-scale and especially for residential power supply with renewable power infeed is presented in this paper. The novelty of this layout is the integration of single- and three-phase AC connected power inverters in combination with different storage technologies. Single phase utilities are leading to grid imbalances which need special consideration. The framework for applications and the operational conditions will be presented with regard to a campus microgrid. Simulation results from a model which considers a hybrid lithium-ion and vanadium redox-flow storage system, with input data from real measurements, will be presented. Advantages and disadvantages of this concept with regard to different methods of power sharing are discussed.