Two demonstration use cases are taking place on the Danish island of Bornholm: a DC microgrid, representing a battery-buffered high-power electric vehicle charging station, and a renewable-based multi-domain virtual power plant (VPP). In both use cases, analytical investigations and preparatory activities related to the upcoming demonstrations, starting this summer, are being carried out.

The microgrid (Figure 1) aims at evaluating the efficiency of an innovative reconfigurable battery technology towards fulfilling specific operational objectives under different configurations, both on cell and system level.

Figure 1. Schematic overview of the microgrid configuration at Campus Bornholm. Arrows indicate power flow: green – to the battery, red – from the battery.

The battery-based EV charging station has been assembled (Figure 2). The microgrid was deemed operational at the end of June, when the Danish partners had a 2-day demonstration kick-off meeting on the island.

Figure 2. Nerve Smart Systems Aps assembling the hardware in the container. To the left – the container itself, to the right – battery modules.

Concerning the virtual power plant (Figure 3), the focus was primarily given to modelling and simulation studies. Particularly, DTU carried out a detailed characterization and flexibility potential assessment of a 3 MW biogas plant, one of the core elements of the VPP, as well as studies on energy management, control and power-to-hydrogen enhancements of the VPP. In parallel, BEOF, the local distribution system operator, modelled the VPP as part of the island’s energy system and investigated possibilities to scale this multi-energy system concept up to the whole island.

Figure 3. Schematic overview of the virtual power plant. 

The demonstration addresses the controllability of the large-scale wind and solar photovoltaic parks, and the coordination between VPP components. It will complement the modelling efforts aiming at reproducible simulation tools for the integrated energy management of islands.