考虑区域源–荷均衡的电磁环网开环分区方案生成方法研究

Research on Generation Methods of Partition Scheme of Electromagnetic Loop Network Considering Regional Source-load Equilibrium

针对500kV/220kV电磁环网结构日益紧密、系统短路电流水平居高不下等问题,研究一种实用有效、高精度的电磁环网开环分区决策方法具有重要意义。通过对迪杰斯特拉算法进行改进,提出一种考虑区域源-荷均衡的电磁环网开环方案生成方法。首先,构建考虑源-荷电气特征的开环电网等效模型;然后,提出考虑源–荷均衡的500kV变电站组合备用策略,求取500kV变电站中心搜索起点;最后,构建一种融入源–荷均衡因子的改进模块度指标,并在此基础上提出基于改进模块度的动态分区原则,从而实现动态搜索高质量的分区方案。基于39节点系统算例和湖南某地区实际电网算例验证了该文方法的准确性和有效性。

To solve the problems such as the increasingly close structure of the 500 kV/220 kV electromagnetic loop network and the high level of short-circuit current in power system, it is of great significance to study the practical, effective and high-precision partitioning method for the electromagnetic loop network. In this paper, the Dijkstra algorithm was improved and a method of generating open-loop schemes considering regional source-load equilibrium for electromagnetic loopnetwork was proposed. Firstly, the grid equivalent model considering the electric characteristics of source and load was constructed. Then, the combined standby strategy of 500 kV substation considering source-load equilibrium was proposed, and the central searching origins of 500 kV substation were obtained. Finally, an improved modularity index with the source-load equilibrium factor was constructed. On this basis, a dynamic partitioning principle based on the improved modularity was proposed to obtain dynamic search high-quality partitioning schemes. Based on IEEE 39-bus system and a regional power grid in Hunan Province, the correctness and effectiveness of the method were verified.