Integrating a Seasonal Thermal Energy Storage FMU in a MATLAB/Simscape Thermal Source Network Model

The integration of Functional Mock-up Units (FMUs) enables effective multi-domain co-simulation and model exchange, offering new possibilities for energy systems modelling considering thermo-hydraulic aspects. This paper presents a case study on incorporating an FMU of a seasonal thermal energy storage (sTES), developed in Modelica/Dymola, into a MATLAB/Simscape model of a thermal source network (TSN). While traditional thermo-hydraulic models are typically confined to a single simulation environment, this study demonstrates the feasibility and advantages of FMU-based interoperability between Modelica/Dymola and MATLAB/Simscape. A key focus is the methodological approach for integratingFMUs into Simscape, addressing interface requirements, solver settings, and model coupling challenges. To illustrate the impact of FMU integration, the authors present simulation results for exemplary operation scenarios: TSN operation with and without an sTES. Additionally, our simulation results offer valuable insights into the influence of sTES on TSN operation and system layout.