As part of the oPENLab project, one major milestone has been the full renovation of the San Pedro building, located in Pamplona (Spain). Researchers from the Spain´s National Renewable Energy Centre (CENER) are developing a digital twin of the refurbished building, integrating key energy systems such as photovoltaic (PV) generation, electrical storage, aerothermics, and electric-vehicles chargers.
This energetic digital twin includes an advanced simulation model to accurately estimate the PV generation across the different roof sections. A 3D model has been created, replicating the physical and electrical layout of the installed PV modules, while accounting for potential sources of local shading (chimneys, TV antenna and surrounding buildings).
To validate the accuracy of the PV simulation model, including the shading loss estimation tool, CENER technicians conducted in-situ electrical measurement, tracing the IV curves of each PV string on a sunny winter day. Instantaneous irradiance and ambient temperature data were also monitored to ensure direct comparison with simulation results.
Further analysis of these measurements will refine the model by improving estimations of other loss factors, such as soiling and module degradation rate. This work enhances the accuracy of the digital twin, supporting more efficient energy management and performance optimization.
A) 3-D PV simulation model showing electrical layout and simulated shading pattern for one of the measuring moments; B) Equipment and set-up for IV curve tracing; C) Examples of measured IV curves and related test conditions
