基于改进K-shell混合度分解法的有源配电网脆弱节点评估  

Assessment of vulnerable nodes in active distribution networks based on improved K-shell mixed degree decomposition method

作　　者：段宏 郭成 陈凤仙 DUAN Hong;GUO Cheng;CHEN Fengxian(Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,China;Qujing Malong Power Supply Bureau,Yunnan Power Grid Co.,Ltd.,Qujing 655000,China)

机构地区：[1]昆明理工大学机电工程学院,云南昆明650500 [2]云南电网有限责任公司曲靖马龙供电局,云南曲靖655000

出　　处：《电力科学与技术学报》2025年第1期67-76,共10页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金(52367002);云南省联合基金专项(202201BE070001-15)。

摘　　要：针对现有配电网节点脆弱性评估方法存在指标选取困难、指标权重片面而难以用于有源配电网脆弱节点评估的问题,提出一种基于改进K-壳(K-shell)混合度分解法(mixed degree decomposition,MDD)的有源配电网脆弱节点评估方法。首先,提出基于信息熵理论改进的K-shell混合度分解法,实现配电网节点脆弱度层级划分;随后,结合分布式电源的地理位置和随机特性,建立基于核密度估计和Copula理论的分布式电源随机出力模型;最后,基于风险理论提出以节点运行风险作为权重修正因子的配电网脆弱节点评估方法。所提方法能有效评估有源配电网的脆弱节点,且面对大规模或超大规模的配电网脆弱节点评估时具有更强的计算效率。通过对IEEE 123系统的算例分析验证所提方法的可行性和优越性。The existing distribution network node vulnerability assessment methods face problems such as the difficult selection of indicators and one-sided weights of indicators,and they thus fail to be used in the assessment of vulnerable nodes in active distribution networks.To address these issues,a vulnerable node assessment method of active distribution networks based on the improved K-shell mixed degree decomposition(MDD)is proposed.Firstly,an improved K-shell MDD based on the information entropy theory is proposed to divide the distribution network node vulnerability hierarchy;subsequently,a stochastic output model of distributed generation based on kernel density estimation and Copula theory is established by combining the geographic location and stochastic characteristics of the distributed generation;finally,a vulnerable node assessment method of distribution networks based on the risk theory is proposed with the node operation risk as a weighting correction factor.The proposed method can effectively assess the vulnerable nodes of active distribution networks and has stronger computational efficiency when facing large-scale or ultra-large-scale vulnerable node assessment of distribution networks.The feasibility and superiority of the proposed method are verified by analyzing the case of the IEEE 123 system.

关 键 词：配电网 分布式电源 脆弱节点 COPULA理论 复杂网络理论 改进的K-shell混合度分解法 

分 类 号：TM73[电气工程—电力系统及自动化]