基于可行域投影理论的新能源电力系统协同运行方法

doi:10.19595/j.cnki.1000-6753.tces.230196

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摘要随着新能源逐步成为电力系统的主体,传统电网体系的深层缺陷也日益显露。跨省区资源优化配置困难和分布式能源利用率低等能源协同体系的不足成为制约新型电力系统建设的瓶颈。为此,该文通过基于外割法的可行域投影等值算法刻画区域系统可行域,并通过并行伞约束辨识法剔除模型冗余约束,进而提出一种基于投影等值理论的新能源电力系统协同运行模式,通过可行域的交互实现各级调度体系间的高效协同,并提出了三种应用场景：配电网/虚拟电厂可行域聚合、省间多通道安全域计算和多时段输配电网协同运行。算例结果表明,所提算法和模式能够有效地降低区域电网规模,从而降低区域电网与调度中心的信息交互量,提升新能源电力系统运行优化效率。

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关键词 ：新能源电力系统, 可行域, 投影等值, 协同调度

Abstract：Vigorously developing the new-type power system dominated by renewable energy to build a clean, low-carbon, safe and efficient energy system is the path for China to achieve the "3060 carbon dioxide emission and carbon neutrality target". With the gradual increase of the penetration of renewable energy, the deep defects of the traditional energy system have gradually emerged. The imperfect energy coordination system, such as difficulty in optimal allocation of resources across provinces and low utilization of distributed energy, has become a bottleneck restricting the construction of new-type power systems. Therefore, the development of the new power system urgently needs to break the barriers of the traditional operation system, realize the efficient cooperation across regions and levels, and optimize the allocation of resources in a larger scope.
Firstly, a new cooperative operation mode of power system based on feasible region projection theory is proposed. Each subsystem in the power system forms a high-dimensional feasible space by aggregating the internal operation constraints and projecting to the common connection points to form its equivalent feasible region. The superior system implements the power balance dispatching of the whole network according to the feasible region of the subsystem to realize the efficient cooperation among all levels of the dispatching system.
Subsequently, the definition of feasible region and its mathematical expression of polyhedron are proposed. It is necessary to find all vertices of the dual space to describe the feasible region. However, the redundancy constraint in power system leads to numerous variables in the dual problem. Even all vertices in the high-dimensional space of regional power grid with simple structure are difficult to be retrieved by traversal. Therefore, combined with umbrella constraint identification method, a feasible region characterization method based on external approximation method is proposed in this paper. The redundant constraints of the original problem are eliminated by umbrella constraint identification, and the feasible region is quickly segmented by external approximation algorithm.
Three application scenarios are proposed: (1) Feasible regions aggregation of distribution network/virtual power plants. (2) Inter-provincial multiline available transmission capacity calculation. (3) Multi-period transmission and distribution network coordinated operation. Case studies show that the algorithm and model proposed in this paper can effectively reduce the scale of the regional power grid, thereby reducing the information interaction between the regional power grid and the system operator, and improving the operation optimization efficiency of the renewable energy power system.

Key words： Renewable energy power system feasible region equivalent projection coordination scheduling

收稿日期: 2023-02-17

PACS:

TM732

基金资助:国家自然科学基金资助项目（52277092）

通讯作者: 李庚银男,1964年生,教授,博士生导师,研究方向为新能源电力系统分析与控制、电力市场、新型输配电技术等。E-mail：ligy@ncepu.edu.cn

作者简介: 张天策男,1995年生,博士研究生,研究方向为新能源电力系统分析与控制、电力市场等。E-mail：ncepu_ztc@ncepu.edu.cn

引用本文:

张天策, 李庚银, 王剑晓, 魏韡, 周明. 基于可行域投影理论的新能源电力系统协同运行方法[J]. 电工技术学报, 2024, 39(9): 2784-2796. Zhang Tiance, Li Gengyin, Wang Jianxiao, Wei Wei, Zhou Ming. Coordinated Operation Method of Renewable Energy Power Systems Based on Feasible Region Projection Theory. Transactions of China Electrotechnical Society, 2024, 39(9): 2784-2796.

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