  An extended use of renewable energies and a trend towards increasing energy
consumption lead to challenges such as temporal and spatial decoupling of
energy generation and consumption. This work evaluates the possible
applications and advantages of hybrid energy storage systems compared to
conventional, single energy storage applications. In a mathematical approach,
evaluation criteria such as frequency, probability of power transients, as well
as absolute power peaks are combined to identify suitable thresholds for energy
management systems on a multi-timescale basis. With experimental load profiles
from a municipal application, an airport, and an industrial application, four
categories, clustering similar roles of the VRFB and the SC, are developed.
