摘要
"源-网-荷"协调性评估有不同视角,从电网安全性角度,潮流分布是三者共同作用的结果,也是制约功率平衡能力的主要因素。前期研究表明,当有功路径的功角均衡时,主网静态安全性最好,但路径功角获取不易。实践经验表明,主网的线路有功负载率均衡性与路径功角均衡性一般正相关;当其较均衡时,主网静态安全性较高。故关键是针对时变潮流分布,如何评估可变时间窗内的线路负载率均衡性。研究发现,在构建主网线路的有功负载率时序矩阵并对其进行奇异值分解后,其主导阵蕴含了负载率总体动态均衡的关键信息,而次要阵则包含了不协调线路的负载率时序特征。故根据奇异值及左奇异向量,文章构建了有功负载率总体均衡性指标,并提出重载线路、不协调线路及时序特征差异的识别方法。针对IEEE39系统的3种运行方式,文章展示了分析过程,验证所提指标及方法的可行性,并与前期研究提出的主网安全性量化指标进行双向验证。该研究为基于大数据的"源-网-荷"协调性评估提供了实用方法,为大电网的运行与规划提供了关键信息。
The source-grid-load coordination can be assessed from different perspectives. From the perspective of power grid security, the power flow distribution is the result of the interaction of the three, and it is also the main factor restricting the power balance. The previous studies show that when the power angle of the active power path is balanced the static security of the main grid is in the best condition, but that it is not easy to obtain the power angle path. Practical experience shows that the line active load rate balance of the main grid is generally positively correlated with the path power angle balance. The more balanced the path power angle is, the better static security of the main grid is. Therefore, the key is how to evaluate the line load ratio balance in the variable time window for the time-varying power flow distribution. Studies have found that after constructing the active load rate sequence matrix of the main grid line and performing the singular value decomposition on it, the main matrix contains the key information of the overall dynamic balance of the load rate,while the subordinate matrix contains the load rate timing characteristics of the uncoordinated line. As a result, according to the singular value and the left singular vectors, the overall balance index of the active load ratio are constructed, and the identification methods of the heavy load lines, the uncoordinated lines and the temporal feature difference are also proposed. For the three operating modes of the IEEE39 system,the analysis process is demonstrated and the feasibility of the proposed indicators and methods are verified, and the two-way verification is carried out with the quantitative index of main grid security proposed in the previous study. This research provides a practical method for the source-grid-load coordination evaluation based on big data, and presents the key information for the operation and planning of large power grids.
作者
竺炜
尹军
路广才
郑超
ZHU Wei;YIN Jun;LU Guangcai;ZHENG Chao(College of Electrical&Information Engineering,Changsha University of Science&Technology,Changsha 410114,Hunan Province,China;China Electric Power Research Institute,Haidian District,Beijing 100192,China)
出处
《电网技术》
EI
CSCD
北大核心
2022年第1期265-273,共9页
Power System Technology
关键词
主网
“源-网-荷”协调性分析
线路有功负载率
负载率时序矩阵
奇异值分解
main grid
source-grid-load coordination assessment
line active load ratio
load ratio sequence matrix
singular value decomposition
