多能源网络稳态能量流分析与计算方法

Analysis and Calculation Method of Steady-state Energy Flow in Multi-energy Network

适用于不同能源形式通用的数学描述和统一的能量流计算方法是多能源网络规划运行的理论基础。文中在构建多能源网络三维拓扑结构图的基础上,提出能量传递的统一描述,借用热力学中强度量和广延量的概念构建多能源网络中支路的能量传递方程。以最常见的圆柱形传递管道为例,推导交直流电能传递、不可压缩黏性流体、可压缩气体,以及热传导、流体传热的支路能量传递过程,并建立描述节点广延量守恒的网络方程。通过采用牛顿-拉夫逊法分别对独立能源子网和多能源网络的稳态能量流进行求解,算例验证了所提方法及模型的可行性。

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 extensive 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 extensive quantity conservation of nodes.The steady-state energy flows of the independent energy sub-networks and multi-energy network are solved by the NewtonRaphson method, and the calculation examples verify the feasibility of the proposed method and model.