Multi-energy systems (MES) involving networks of different energy carriers can support the balancing of fluctuating renewable generation by co-ordinated joint operation. In this paper

an object-oriented modeling methodology for planning and operations control of MES based on nodal analysis is proposed. The framework provides the modularity to simulate scenarios with varying network configurations. Based on object-oriented programming

classes are formed with regard to common attributes of the network elements. The instances of classes represent physical network elements

such as buses

lines

and power conversion units. The models of the individual network elements involve adjustable and flexible parameters. This is especially advantageous for scenarios with operating-point-dependent efficiencies. The overall framework makes use of a uniform description of the model parameters across the diverse energy carriers. Thus

the methodology is particularly suited for the analysis of MES. The applicability of the modeling framework is demonstrated by two use cases involving a technology campus in Berlin.