Co-optimisation of power-gas networks connected to industrial energy hubs with high penetration of storage systems

Abstract

With proliferation of gas-fired generators and increase in the number of interconnected power-gas networks, co-optimisation of power-gas nexus has become a hot research area. Energy hubs (EHs) are efficient and reliable multi-carrier energy systems which typically take in electricity and natural gas and supply different forms of energy demands. As EHs typically import electricity and gas, their connection into a power-gas nexus may be an interesting option; their electricity input may be connected into an electric bus and their gas input may be connected into a gas node. This research focuses on the operation of power-gas nexus connected to industrial EHs. The Belgian network connected to a 24-bus power system has been used as case study and the studied EH includes boiler, combined heat and power unit, battery and thermal storage and supplies electricity and heat demands. The changes in shadow prices at different electric buses and gas nodes as well as congestion in both networks are investigated. The effect of connection points of EH on total operation cost, electric system cost and gas network cost is investigated and the optimal connection points are determined. According to the results, about 49.4 % of total cost belongs to electric system and the remaining 50.6 % belongs to gas system and a large portion of electric system cost belongs to demand shed cost. According to the results, the electric system is severely congested. At some buses and some hours, due to demand shed, the shadow price of electricity soars 10,000$/MWh which equals value of lost electric load.