Integrated analysis of electrical and gas transmission networks considering primary frequency control

The increasing global use of natural gas for electric power generation has motivated the study of existing inter-dependencies between electricity and natural gas transmission networks, which are traditionally analyzed as independent systems. Within this context, a novel approach to the integrated formulation of the natural gas and electric power flow problem is proposed in this paper. This formulation is developed in a single frame of reference that allows an integrated energy flow analysis. Contrary to the current proposals for performing this type of analysis, the generator-governor characteristics, as well as the voltage and frequency dependence of loads, are incorporated into the system of equations of the electric power flow problem. This permits a better representation of the interaction between both energy infrastructures and of their actual operating conditions. The applicability of the proposed approach is demonstrated by analyzing an integrated multi-energy system composed of the IEEE 118-bus electrical system and a 15-node natural gas infrastructure.