一种考虑天然气系统动态过程的气电联合系统优化运行模型

An Optimal Energy Flow Model in Integrated Gas-Electric Systems Considering Dynamics of Natural Gas System

由于环境污染和能源短缺问题的凸显,天然气-电力耦合形成的多能源互联系统因其清洁、高效引起了众多关注。然而天然气系统运行和电力系统运行属于2个不同的时间尺度,其耦合系统运行须考虑这一因素的影响。针对这一问题,推导了天然气系统动态潮流方程,考虑气电联合系统双边能量转换关系,建立了耦合系统的多时段优化运行模型,并在一定假设情况下,对模型进行了合理的线性化处理,使得该模型可以很好地反映耦合系统中天然气侧系统的动态过程,且能适用于大规模问题求解要求。最后通过仿真算例验证了所提模型的合理性和有效性。

Due to depletion of fossil fuel resources and public concern on climatic change, integration of natural gas and electrical power systems for improving sustainability and efficiency draws broad interests. However, operations of gas and power networks lie in different time-scales. Hence, it is necessary to consider such distinguished characteristics when investigating integration of these two systems. Under these circumstances, this paper derives dynamic energy flow equations in natural gas system. And multiple time-period optimal power flows in gas and power systems are coupled with bi-directional energy flow. Proper assumptions are made to linearize the formulated optimization problem while maintaining dynamic behavior of gas flow in pipes. Simulation results demonstrate effectiveness and accuracy of the proposed modeling techniques. The proposed method is suitable for large-scale integrated gas-electric systems.