The German government's energy policy stipulates that the share of renewable energies in the electricity supply must be at least 35 percent by 2020 and a good 80 percent by 2050. To achieve this, the individual elements of the energy transition must interlock seamlessly. Electric energy storage is an important system element in order to stabilize the unsteady flow of electricity from wind power and solar plants in line with demand. Another element is a power converter that feeds the required type of voltage into the grid. However, power converters have a negative influence on the course of the voltage signal. In order to guarantee a constant voltage quality, the grid operators use system services. At present, storage and system services are still technically implemented in separate elements/assemblies – a large number of different systems are required for the different services. As part of the HYBKomp joint project, a technically new solution is being demonstrated that unites the individual components in one system.