综合能源系统分析的统一能路理论(五):电–热–气耦合系统优化调度

Energy Circuit Theory of Integrated Energy System Analysis (Ⅴ): Integrated Electricity-Heat-Gas Dispatch

多能流系统耦合调度相比独立调度可以有效降低运行成本,提高可再生能源消纳,目前已经成为一大研究热点。但是,现有的研究大多采用稳态的热网和天然气网模型,这一方面忽略动态特性中蕴含的调度灵活性,另一方面还可能导致调度结果不准确,引发安全问题。该文基于统一能路理论,建立一种新的电–热–气耦合多能流系统优化调度模型,将描述热网和天然气网络动态的复杂偏微分方程转化为线性复代数方程,易于优化求解。此外,统一能路模型是基于偏微分方程的解析解推导的,具有高精度。算例表明,文中建立的优化调度模型可以利用热网和天然气网的动态特性来提高调度灵活性,降低系统运行成本。相比已有方法,文中建立的优化调度模型具有求解速度快、模型精度高的优点。

Compared with independent dispatch, the coupled dispatch of multi-energy systems can effectively reduce operating costs and increase the consumption of renewable energy, which has become a major research focus. However, most of the existing studies used the steady-state model of heating network and natural gas network. The steady-state models not only ignore the scheduling flexibility contained in the dynamic characteristics and may also lead to inaccurate scheduling results which will cause safety problems. Based on the energy-circuit theory, this paper proposed a new integrated electricity-heat-gas dispatch model. In this model, the complex partial differential equations, which describe the dynamics of the heating network and natural gas network, are transformed into linear complex algebra equations that are easy to use in dispatch model and solve. In addition, the energy-circuit model has high accuracy because it is derived based on the analytical solutions of partial differential equations. The results of case studies show that the proposed dispatch model can utilize the dynamic of the heating network and natural gas network to improve the flexibility of dispatch and reduce the operating cost of the system. Compared with the existing methods, the proposed dispatch model has the advantages of fast solution speed and high model accuracy.