计及相关性的含分布式电源配电系统可靠性评估  

Reliability Evaluation of Distribution Network with Distributed Generation Considering Correlations

作　　者：胡美玉[1] 胡志坚[1] 胡梦月[1] 

机构地区：[1]武汉大学电气工程学院,武汉市430072

出　　处：《电力建设》2016年第9期108-114,共7页Electric Power Construction

基　　金：高等学校博士学科点专项科研基金资助项目(20110141110032)~~

摘　　要：为了分析风速、光照强度和负荷间相关性对配电系统可靠性的影响,提出了一种计及相关性的含分布式电源(distributed generation,DG)配电网可靠性评估模型。首先,采用秩相关系数矩阵、拉丁超立方抽样技术和Cholesky分解建立了样本抽样方法,该方法能有效处理非正态分布随机变量的相关性以及非线性相关关系。然后,提出了基于孤岛稳定运行概率修正传统可靠性指标的方法,将传统配电网可靠性评估与含DG配电网可靠性评估有效结合,以提高评估效率。最后,通过算例定量分析了相同类型DG、不同类型DG、DG与负荷相关性强度变化对孤岛稳定运行概率以及配电系统可靠性指标的影响,验证了所提模型与方法的合理性。To analyze the impact of correlation between wind speed, illumination intensity and load demand, this paper proposes a new reliability evaluation model for distribution system with distributed generation （DG） considering correlation. Firstly, we adopt the correlation coefficient matrix, Latin hypercube sampling and Cholesky decomposition to establish a sampling method, which can effectively deal with the correlations between the non-normal distribution random variables and the nonlinear relationship. Then we propose the method of correcting the traditional reliability index based on island stable operation probability, which effectively combines the traditional distribution reliability assessment with the distribution reliability assessment containing DG to improve the assessment efficiency. Finally, through the quantitative analysis on examples, we analyze the influences of correlation intensity between the same type DG, different types of DG, DG＇ and load on island stable operation and distribution system reliability index, whose results verify the feasibility of the proposed model and method.

关 键 词：配电系统 分布式电源(DG) 相关性 孤岛运行 可靠性评估 

分 类 号：TM72[电气工程—电力系统及自动化]