考虑分布式电源相关性的配电网概率潮流计算  

Probabilistic Load Flow Calculation for Distribution Network Considering Correlation Between Distributed Generations

作　　者：许加柱[1] 贾龙涛 李畅[1] 王岐珂 XU Jiazhu;JIA Longtao;LI Chang;WANG Qike(National Electric Power Conversion and Control Engineering Technology Research Center(Hunan University),Changsha 410082,China)

机构地区：[1]国家电能变换与控制工程技术研究中心(湖南大学),长沙410082

出　　处：《电力系统及其自动化学报》2021年第5期106-112,共7页Proceedings of the CSU-EPSA

基　　金：国网湖南省电力有限公司科技资助项目(5216A5170015)。

摘　　要：为探究分布式电源出力的相关性对交流配网的影响,提出一种考虑分布式电源出力相关性的配电网概率潮流计算方法。首先,采用Copula函数描述分布式电源出力的相关性,建立联合分布函数;其次,通过Rosenblatt逆变换将分布式电源的出力进行独立化变换,使之相互独立,并采用半不变量法结合Cornish-Fisher级数展开计算概率潮流,求得节点电压、支路潮流的概率分布;最后,以34节点系统为研究对象,对所提方法进行仿真分析。仿真结果验证了该方法用于配电网概率潮流计算的有效性和正确性。To explore the impact of the correlation between distributed generation(DG)outputs on AC distribution network,a probabilistic load flow(PLF)calculation method for distribution network considering the correlation is proposed in this paper.First,the Copula function is used to describe the correlation,and a joint distribution function is established.Then,the DG outputs are independently transformed using the Rosenblatt inverse transformation to make them independent of each other.In addition,the PLF is calculated using the cumulant method combined with the Cornish-Fisher expansion,and the probability distributions of node voltage and branch current are obtained.Finally,a 34-node system is taken as the research object,and the proposed method is simulated and analyzed.Simulation results verify the effectiveness and correctness of the application of this method to the PLF calculation of distribution network.

关 键 词：配电网 概率潮流 COPULA函数 Rosenblatt逆变换 半不变量法 

分 类 号：TM744[电气工程—电力系统及自动化]