The report reports on the executive design activities carried out to build, within the RSE Distributed Energy Resources Test Facility (DER-TF) laboratory, a demonstrator of a hybrid MV/LV distribution grid with integrated DC and AC parts and a multi-energy system with the introduction of new energy vectors such as heat and gas. With regard to the medium voltage extension of the test facility, the executive design for the electrical extension of the plant was developed, taking into account all technical and authorization aspects. In particular, once the best location for the new transformers and cable ducts had been confirmed, permits were applied for and the construction areas were identified. The development of the executive design was also completed with all the plant and ancillary works (concrete slabs, underground grid, auxiliary power systems and communication network).
The activities for the development of the direct current grid of the RSE test facility were carried out by analyzing the possible extensions of the grid with the aim of creating a configuration with three points of connection to the alternating current grid and with a three-conductor bipolar configuration.
In order to pursue the integration of the district heating network into the DER-TF laboratory, the detailed design of the new infrastructure was developed (mechanical, electrical and instrumentation and control design). The mechanical design allowed the definition of the components, the functional plant diagrams, the creation of the overall plant diagram (Process/Piping and Instrumentation Diagram, P&ID) and the layout of the new infrastructure. The electrical design was based on single-line diagrams for the main and auxiliary circuits. The district heating network was designed with a modular approach, which allows the plant to be operated with all systems or only some of them in operation, ensuring the possibility of developing and building the plant with increasing levels of complexity.