School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China
A universal mathematical description and a unified energy flow calculation method suitable for different energy forms are the theoretical basis for the planning and operation of multi-energy networks. On the basis of constructing the three-dimensional topological diagram for the multi-energy network, this paper proposes a unified description for energy transfer, and constructs the energy transfer equations of branches in the multi-energy network by borrowing the concepts of intensity quantity and extension quantity in thermodynamics. Taking the most common cylindrical transmission pipeline as an example, this paper derives the energy transfer processes of branches of the AC and DC power transmission, incompressible viscous fluid, compressible gas, heat conduction and fluid heat transfer, and then establishes a network equation describing extension quantity conservation of nodes. The steady-state energy flows of the independent energy sub-networks and multi-energy network are solved by the Newton-Raphson method, and the calculation examples verify the feasibility of the proposed model.
|||ZHU Yongqiang, CAI Qinqin, GONG Ping, et al. Analysis and Calculation Method of Steady-State Energy Flow in Multi-energy Network[J/OL]. Automation of Electric Power Systems, http://doi. org/10.7500/AEPS20210331004.|