基于PSO-Newton法的电-气综合能源系统能流计算

在全球能源形势日趋严峻的情况下,传统单一的电力系统能源结构已经无法满足发展的需求。随着电解制取天然气(P2G)技术及燃气轮机技术的迅速发展,电力系统与天然气系统的联系变得紧密起来。能流计算作为电-气系统耦合分析的基础与关键,对其研究显得尤为重要。文中首先分析了电力系统与天然气系统数学模型,针对牛顿(Newton)法中较难解决天然气系统对压力初值的选取问题,提出利用粒子群(PSO)算法对压力初值进行优选;然后利用Newton法顺序求解电-气综合能源系统(IES)的能流;最后在由IEEE 14节点配电系统和14节点天然气系统组成的电-气耦合系统中验证了所提方法的可行性和准确性。

Energy flow calculation of integrated power-gas energy system based on PSO-Newton method

Under the increasingly severe global energy situation,the traditional single power system energy structure has been unable to meet the needs of development. With the rapid development of power-to-gas(P2G) and gas turbine technology, the connection between the power system and natural gas system becomes closer. As the basis and key of coupling analysis of the power-gas system, the study of energy flow calculation is of great importance. In this paper, firstly, the mathematical models of power system and natural gas system are analyzed. Aiming at the problem of choosing initial pressure value in natural gas system which is difficult to be solved in Newton method, the particle swarm optimization(PSO) is proposed to optimize the initial pressure value, and then Newton method is used to solve the energy flow of the power-gas integrated energy system. Finally, the feasibility and accuracy of the proposed method are verified in the power-gas coupling system composed of IEEE 14-node power distribution system and 14-node natural gas system.