考虑邻域耦合程度的次区域主导节点优化辨识方法  

Optimal Identification of Subregional Dominant Node Considering the Neighbourhood Coupling Degree

作　　者：郭小龙 宋朋飞 GUO Xiaolong;SONG Pengfei(State Grid Xinjiang Electric Power Co.,Ltd.,Urumqi 830063,China)

机构地区：[1]国网新疆电力有限公司,乌鲁木齐830063

出　　处：《电力电容器与无功补偿》2024年第6期83-91,共9页Power Capacitor & Reactive Power Compensation

基　　金：国网新疆电力有限公司科技项目(SGXJ0000TKJS2200415)。

摘　　要：电网结构的日益复杂和运行方式变化对系统的电压稳定性影响显著,传统的电压控制方法难以准确辨识电压主导节点,限制了局部电压的有效控制。针对这一问题,本文提出了一种考虑邻域耦合程度的次区域主导节点优化辨识方法。该方法基于对电网进行合理划分,获取反映局部电压控制特性的次区域,并通过构建主导节点优化辨识模型,准确定位各次区域的电压主导节点。首先,考虑无功源控制特性,构建电气距离全维扩展矩阵模型,采用层次聚类算法实现电网的次区域划分;其次,结合区域的连通性原则,分析次区域内可控节点与相邻区域的功率电压耦合关系,构建考虑邻域耦合程度的综合灵敏度指标,根据指标计算结果辨识各次区域的主导节点;同时,研究电网在不同运行方式下主导节点的变化情况,验证所提辨识方法的灵活适应性。最后,采用IEEE 39节点系统进行仿真分析,结果表明,所提方法综合考虑了邻域节点的耦合程度,相较于传统主导节点选取方法更为可靠。此外,该方法不仅适应灵活多变的电网运行方式,还能为复杂网络的无功补偿容量规划提供有效支撑。The increasing complexity of the grid structure and the variation of the operation mode have a significant impact on the voltage stability of the system,and the traditional voltage control method is difficult to accurately identify the voltage dominant node,which restricts the effective control of the local voltage.In view of this issue,a subregional dominant node optimal identification method considering the neighbourhood coupling degree is proposed in this paper.The method is based on a reasonable division of the grid,the subregions reflecting the local voltage control characteristics is obtained,and the voltage dominant nodes in each subregion is accurately located by constructing the dominant node optimal identification model.Firstly,the fulldimensional extension matrix model of electrical distance is constructed through considering the control characteristics of reactive power sources,and the hierarchical clustering algorithm is used to achieve the subregional classification of the grid;Then,combining the principle of connectivity of the region,the powervoltage coupling relationship between controllable nodes in the subregion and adjacent regions is analyzed,and a comprehensive sensitivity index considering the neighbourhood coupling degree is constructed,and the dominant node in each subregion is identified in accordance with the results of the index calculations.At the same time,the variation of dominant node under different operation modes of the grid is studied to verify the flexibility and adaptability of the proposed identification method.Finally,the IEEE 39 node system is used for simulation analysis.The results show that the proposed method takes the coupling degree of neighbouring nodes into account,and is more reliable than the traditional dominant node selection method.In addition,the method not only adapts to the flexible and variable grid operation mode,but also provides effective support for the reactive power compensation capacity planning of complex networks.

关 键 词：电网分区 综合灵敏度 主导节点优化辨识 电压稳定性 

分 类 号：TM71[电气工程—电力系统及自动化]