考虑跨区能流交互计划的多区域电-气综合能源系统分散调度方法

针对多区域电-气互联系统优化调度问题,提出考虑联络线、联络管道能流交互计划的分散式调度方法。首先,利用二阶锥松弛方法将气网潮流方程线性化;在区域间,通过优化联络线与联络管道能流交互计划,对机组出力进行优化配置以促进互联区域的风电消纳,并以单个区域为决策主体建立满足联络线与联络管道约束的集中式优化模型。然后,分析了多区域电-气互联系统能量流解耦机制,并基于标准交替方向乘子法,得到分散式优化算法,即同步交替方向乘子法(synchronous-alternating direction method of multipliers,S-ADMM),再利用上述算法对集中式模型进行重构,建立一种完全分散式的调度模型。最后,在不同规模的多区域电-气互联系统中开展算例分析,其结果表明:所提算法有较优的收敛性;通过联络线与联络管道的互联方式使系统运行最优;多区域电-气互联系统可改变联络线峰谷差率,使各区域发电资源达到配置最优,并减少了区域弃风量,降低了运行成本,可为多区域能源系统优化运行提供参考。

Distributed Dispatch Method for Multi-region Electricity-Gas Integrated Energy Systems Considering Cross-region Energy Flow Interaction Plan

According to the problem of collaborative optimization with multi-region electricity-gas interconnection system, a distributed optimization method considering interaction plan of energy flow with tie lines and tie pipes is proposed in this paper. Firstly, the second-order cone relaxation is adopted to linearize the gas flow equation of the gas network; between regions, by optimizing the energy flow interaction plan of the connection line and pipeline, the output of the generation unit is optimized to promote the wind power consumption in the interconnected region, a centralized optimization model that satisfies the constraints of the tie line and the tie pipe is established with a single region as the decision-making subject. Then, the paper analyzes the energy flow decoupling mechanism of multi-region electricity-gas interconnection system, and on the basis of a standard alternating direction multiplier method, a decentralized optimization algorithm, synchronous-ADMM method (S-ADMM), is obtained, in which the authors performs a reconstruction solution and establishes a completely decentralized scheduling model. Finally,the analysis of calculation examples is carried out in multi-regional electrical interconnection systems of different scales, and it is obtained that the proposed algorithm has better convergence; the system operation is optimized by the interconnected way of tie lines and pipes; the multi-region interconnection system can be changed by the peak-to-valley ratio of tie line optimizes the allocation of power generation resources in each region, reduces the amount of regional wind abandonment, and reduces operating costs, which can provide a reference for optimization of multi-regional energy systems.