计及光伏波动性的配电网敏感负荷供电可靠性评估  

Power Supply Reliability Evaluation of Sensitive Loads in Distribution Networks Consider Fluctuation of Photovoltaic Generation

作　　者：罗海波 LUO Hai-bo(Meizhou Power Supply Bureau,Guangdong Power Grid Co.,Ltd.,Meizhou 514000)

机构地区：[1]广东电网有限责任公司梅州供电局,梅州514000

出　　处：《环境技术》2024年第10期199-204,共6页Environmental Technology

基　　金：南方电网公司科技项目,项目编号:031400KC23070004。

摘　　要：大规模光伏接入配电网会使配电网的电压波动更加频繁和明显,为定量评估光伏对配电网敏感负荷的负面影响,本文提出了计及光伏波动性的配电网敏感负荷供电可靠性评估方法。首先,根据光伏历史数据,构建特征向量,并通过聚类得到光伏出力曲线对应的天气类型;其次,按天气类型分别分析光伏波动特征,采用核密度估计对光伏的随机波动进行概率建模;接着,利用光伏波动的概率模型抽样,并通过电压降落公式得到全年电压波动样本;最后,根据电压波动样本,构建敏感负荷供电可靠性指标,从多维度评估可靠性。实验结果表明,所提方法可以对不同天气类型下的光伏波动性特征进行针对性概率建模,可以多维度定量评估受光伏波动影响的敏感负荷供电可靠性,对于配电网光伏规划和运行有指导作用。The integration of large-scale photovoltaics into distribution networks will cause more frequent and significant voltage fluctuations.To quantitatively evaluate the negative impact of photovoltaics on sensitive loads in distribution networks,this paper proposes a reliability assessment method for sensitive load power supply in distribution networks considering fluctuations of photovoltaic generation.Firstly,based on historical data of photovoltaic generation,a feature vector is constructed and weather types corresponding to photovoltaic output curve is obtained through a clustering algorithm.Secondly,characteristics of photovoltaic fluctuations are analyzed according to the weather types,and probability models of the random fluctuations of photovoltaics generation are constructed using kernel density estimation.Thirdly,photovoltaic fluctuations are sampled using the probability models,and then samples of annual voltage fluctuations are obtained based on the voltage drop equation.Finally,based on voltage fluctuation samples,power supply reliability indexes of sensitive loads are constructed to evaluate reliability from multiple perspectives.The experimental results show that the proposed method can construct probability models of photovoltaic fluctuation characteristics under different weather types,and can evaluate power supply reliability of sensitive loads quantitatively considering photovoltaic fluctuations from multiple perspectives.It is an instruction for planning and operation of photovoltaics in distribution networks.

关 键 词：光伏波动 敏感负荷 可靠性 配电网 

分 类 号：TM732[电气工程—电力系统及自动化]