Unified Energy Flow Analysis in Integrated Energy Systems Considering Nonlinear Performance

A unified energy flow analysis in the state of steadiness was studied in this thesis by taking account of electricity, natural gas, and district heating network simultaneously. An explanation for this is that the increase of co-generation equipment use creates a doughty network coupling. Especially the increase of district heating network use are more efficient in addition to emitting less CO
₂
than local boiler. Additionally, inter-dependency of infrastructures mentioned were taken into account, a non-linear partially load effective performance for the unit included. Integration frame on the basis of Newton-Raphson technique is proposed for solving problems of combined energy flow, and applicability of this method is verified via a case study with integration system of energy system composed of a fourteen-node electricity power system, 20-node natural gas system, as well as fourteen-node district heating system.