• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

电力建设 ›› 2018, Vol. 39 ›› Issue (9): 120-128.doi: 10.3969/j.issn.1000-7229.2018.09.015

• 智能电网 • 上一篇    下一篇

基于分段Copula函数和高斯混合模型的多段线性化概率潮流计算

 

江雪辰1,袁越1,吴涵1,徐蕴岱1,黄阮明2,王跃峰3
  

  1. 1. 河海大学能源与电气学院,南京市 211100;2.国网上海市电力公司,上海市 200120;3.中国电力科学研究院有限公司,北京市 100192
  • 出版日期:2018-09-01
  • 作者简介:江雪辰(1994),女,硕士研究生,研究方向为含可再生能源的电力系统分析; 袁越(1966),男,教授,博士生导师,主要研究方向为电力系统运行与分析、可再生能源发电系统等; 吴涵(1990),男,博士研究生,主要研究方向为配电网规划; 徐蕴岱(1991),男,博士研究生,主要研究方向为电力系统运行与分析; 黄阮明(1980),男,高级工程师,主要研究方向为电网规划与新能源发电并网技术; 王跃峰(1981),男,高级工程师,主要研究方向为电力系统运行与分析。
  • 基金资助:
    国家电网公司科技项目(考虑季节性和随机性影响的大规模清洁能源年月计划优化方法研究与应用)

Multistage Linearization Probabilistic Power Flow Calculation Based on Piecewise Copula and Gaussian Mixture Model

JIANG Xuechen1, YUAN Yue1, WU Han1, XU Yundai1, HUANG Ruanming2, WANG Yuefeng3   

  1. 1.College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China;2. State Grid Shanghai Electric Power Company, Shanghai 200120, China;3. China Electric Power Research Institute, Beijing 100192, China
  • Online:2018-09-01
  • Supported by:
    This work is supported by State Grid Corporation of China Research Program.

摘要: 大规模风电并网以及负荷的随机波动加剧了电网运行的不确定性,为了有效分析新环境下的电网运行特性,提出一种基于风功率分段Copula函数和负荷高斯混合模型的多段线性化概率潮流计算方法。采用分段Copula函数在时间维度上刻画相邻风电场的空间相关性,分析风功率相关性的季节变化。针对实际负荷的不对称、多峰特性,采用改进K-means聚类优化的期望最大化(expectation maximization,EM)算法,准确快速地建立负荷高斯混合模型。在此基础上,采用多段线性化半不变量法进行概率潮流计算,以减小风功率和负荷大范围波动造成的潮流方程线性化误差。对改进的IEEE 14节点系统进行仿真分析,验证了所提方法的准确性、快速性及有效性。

关键词: 概率潮流, 分段Copula函数, 季节相关性, 高斯混合模型, 多段线性化, 半不变量

Abstract: Large-scale integration of wind power into grid and load stochastic volatility increase the uncertainty in power system operation, in order to effectively analyze the system operation features in the new environment, a calculating method based on wind power piecewise Copula and load Gaussian mixture model for multistage linearization probabilistic power flow is proposed. Piecewise Copula is used to establish the spatial correlation model among wind farms on the time dimension considering seasonal variation. For non-normal and multimodal load, expectation maximization (EM) algorithm is used to establish load Gaussian mixture model, and an improved K-means clustering is proposed to optimize EM algorithm, which can simplify the modeling process. On the premise of these models, calculating probabilistic power flow in the method of multistage linearization cumulant method, fully considering the impact of wind power and load fluctuation on the system operation. The accuracy and efficiency of the proposed probabilistic power flow calculation process is verified through the test on modified IEEE 14-bus system.

Key words: probabilistic power flow, piecewise Copula, seasonal correlation, Gaussian mixture model, multistage linearization, cumulant

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