Energy Network Theory for Modeling and Analysis of Integrated Energy Systems

The fundamental theory of energy networks in different energy forms is established following an in-depth analysis of the nature of energy for comprehensive energy utilization. Based on the physical theories of analytical mechanics, thermodynamics, heat transfer, fluid mechanics (fluid network), electromagnetic field theory (electric network), the generalized equations of energy transfer and transformation are established. Then the generalized lumped element models are derived, which include the generalized resistance, capacitor and inductance. To establish the equations of energy networks, the Kirchhoff’s Law in electric networks is extended to energy networks, which is called the Generalized Kirchhoff’s Law. The equations are finally unified into a complete energy network equation system. A numerical example is given to testify the effectiveness of energy network theory.