Stationary Battery Storage: Presenting a Benchmark System with Integrated DC Charger

Abstract

The described technical system in this paper portrays the amalgamation of two previously separate technical entities: the integration of a DC high power charger (HPC) for recharging battery electric vehicles (BEVs) in a stationary battery energy storage system (BESS). By eliminating the duplicity of multiple components, which stand-alone BESS and HPC share mutually, a new more compact and efficient integrated system can be constructed. Significant advantages are the result: higher battery capacity, smaller space footprint, higher round-trip efficiency, fewer component defects and overall lower CAPEX and OPEX to name the most important. Additionally, the paper explains the methodology surrounding the new innovative system’s most prominent application: peak shaving of load curves or “atypical grid usage” in Germany. The presented exemplary load curve also includes short spikes resulting from BEVs recharging with high power (> 150 kW) in very short periods of time (< 20 min.). The authors hope to provide a better understanding of this new innovative technical system design including its connected monetary savings in a viable business case, helping to contribute to the global energy and mobility transition.