Paper Conference

Proceedings of Building Simulation 2017: 15th Conference of IBPSA


Urban Energy System Simulation using the Functional Mock-Up Interface

Markus Schumacher, Marcus Fuchs, Dirk Mu¨ller
RWTH Aachen University, E.ON Energy Research Center, Institute for Energy Efficient Buildings and Indoor Climate

Abstract: The growing level of complexity in urban energy systems (UES) makes integrated simulation models indispensable. Efforts to link models of different domains have been made, but only few integrated approaches exist. Most building simulation models show either high computational effort or a low level of detail, which reduces their applicability for district analyses. The presented approach consistently uses reduced order models that only capture key effects for the simulation of UES, leading to comparably low computational effort. We make extensive use of opensource tools and show how the integration of those can be accomplished within a Python framework using the functional mock-up interface (FMI) standard. In order to adapt the environment to the purpose of a particular UES analysis, its individual modules are replaceable. Harnessing this flexibility, a case study was conducted, analyzing an UES of eight buildings with different structural and operational designs. In addition to the general feasibility of the proposed framework for simulation-based design of UES, the results show the positive effect of grid-driven electric heating devices (EHD) on the power grid. By this means, a reduction of the transformer flow bandwidth by 40 % is achieved. Nomenclature LB Lower residual load bound for release/forced operation n Number of released HP/CHP PApp(t) Load of household appliances at time t PBES(t) Aggregated power demand for heating at time t Pel Electric capacity of EHD PPV(t) Photovoltaic generation at time t PTF Transformer flow at time t PTF ∗(t) Preliminary transformer flow at time t Q˙th Thermal capacity of EHD Ton/off,s Threshold storage temperature of TwoPoint-Controller depending on grid state 0...2 T Storage temperature at top/bottom UB Upper residual load bound for release/forced operation vm Voltage magnitude xMod Modulation range of EHD BES Building energy system CHP Combined heat and power DHW Domenstic hot water DSM Demand side management EHD Electric heating device FMI Functional mock-up interface FMU Functional mock-up unit HP Heat pump MES Multi energy systems PV Photovoltaic TES Thermal energy storage UES Urban energy systems
Pages: 2484 - 2493