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

Abstract

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.