Nowadays, the power system is transferring towards a smarter, cleaner, and more efficient system, which introduces challenges including the uncertainty in renewable generation, complication in customer behaviour, and applications in using the emerging technologies. In order to meet the challenges of the transition of the power system, the concept of energy hub is proposed to efficiently meet the increasing energy demand with less carbon emission by coordinating different energy infrastructures including electricity, gas, and heat. As a powerful conceptualisation, the energy hub system can increase system flexibility, reliability, and profits by maximally exploiting the value in each energy carrier.