Sequence iterative method-based steady-state analysis of integrated electricity, gas and heating networks

Abstract

The increasing linkages and interdependencies between multiple energy systems and the demand for higher overall energy efficiency of these systems put into force their combined management as multi-energy systems (MESs). This study comprised the development of a method for the steady-state analysis of the multi-energy flows of electricity, gas and heating systems, which is a fundamental tool for real operation and operational planning. A sequence iterative method was introduced for sequentially determining the energy flows of each system. This method is a relaxation of an existing uniform Newton’s formulation for handling the negative effect on convergence due to the hybrid quadratic and exponential 1/2 gas equations. Industry-based software for electricity simulation and pipeline programs enabling gas and heating analysis were incorporated into the method. Moreover, the mechanism of a distributed regulating unit scheme was developed for data-exchange between sub-networks under analysis. The applicability of the proposed method was demonstrated by analysis of representative small-scale and large-scale systems.