Energy consumption is growing in parallel with growth of economy. To meet needs of industrial,
commercial and local users and to enable transfer of people and goods, a sufficient supply of energy
must be provided. The energy infrastructure needs to be increased and diversified to provide energy
needed by each region for future economic growth. The consideration of multiple energy carriers, not
only electricity, represents an opportunity for system improvement. The couplings among different
infrastructures must be taken into consideration in the light of the idea of “energy hub". This paper
introduces a general modelling and optimization approach for power dispatch and conversion in energy
systems including different energy carriers. Loads are supplied using different structures of energy hub
to get the optimal structure of the hub. Finally, the approach is demonstrated in numerical case studies.