由电力系统和天然气系统耦合构成的电-气综合能源系统是“能源互联网”的重要组成部分,是实现能源低碳、高效、环保利用的关键环节。本文提出了一种考虑电转气(power to gas, P2G)的电-气综合能源系统分布式最优能量流模型及分布式求解算法。首先对P2G技术中的电转甲烷技术进行简单的概述；其次,以电-气综合能源系统的运行成本为优化目标,综合考虑电力系统、天然气系统运行约束及能量耦合约束,建立电-气综合能源系统的最优能量流(optimal energy flow, OEF)模型；针对电力系统和天然气系统归属于不同利益主体的特点,提出了基于交替方向乘子法(alternating direction multiplier method, ADMM)的OEF模型求解方法；最后,在IEEE-39节点电力系统和修改的比利时20节点天然气系统组成的电-气综合能源系统进行算例分析,仿真结果表明,考虑P2G的OEF模型可充分提高系统运行经济性,本文的模型求解算法在保证精度的情况下大大提高了计算的求解速度。
英文摘要:
The integrated energy system, which consists of the coupling and interactions among electric power system and natural gas system, plays an important part in “Energy Internet”. A distributed optimal energy flow of electricity-gas integrated energy system considering P2G, and its model and distributed solution algorithm is proposed. Firstly, a simple overview of P2G technology is summarized. Then, considering the operation constraints of electric power system, natural gas system and energy coupling constraints in integrated energy system, an optimal energy flow is proposed with minimized total cost as the objective. Considering the ownership of power systems and natural gas systems, a method for solving the OEF model based on alternating direction multiplier method is proposed. Finally, the model is verified on a integrated energy system consisting of modified IEEE 39-bus power system and Belgian 20-bus natural gas system. The simulation results shows that the model of this paper can improve the economical efficiency of the system. Besides, the solving algorithm of this paper can greatly improves the calculation speed of calculation without losing accuracy.