户用光伏接入的低压配电网电能质量问题分析与附加损耗量化评估  

Analysis of power quality issues and quantitative evaluation of additional losses in low voltage distribution networks connected to household photovoltaics

作　　者：韩宇 周前 李勇[1] 卞欣科 邓威 安海云 张传文 HAN Yu;ZHOU Qian;LI YONG;BIAN Xinke;DENG Wei;AN Haiyun;ZHANG Chuanwen(College of Electrical and Information Engineering,Hunan University,Changsha 410082,China;Electric Power Research Institute,State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211103,China;Electric Power Research Institute,State Grid Hunan Electric Power Co.,Ltd.,Changsha 410017,China)

机构地区：[1]湖南大学电气与信息工程学院,湖南长沙410082 [2]国网江苏省电力有限公司电力科学研究院,江苏南京211103 [3]国网湖南省电力有限公司电力科学研究院,湖南长沙410017

出　　处：《电力科学与技术学报》2024年第3期177-186,共10页Journal of Electric Power Science And Technology

基　　金：国家电网有限公司科技项目(5400-202318203A-1-1-ZN)。

摘　　要：针对户用光伏的大量无序接入导致低压配电网附加损耗严重增大的问题,对配电网附加损耗的量化分析是实现电力系统节能降损的必要途径之一。以户用光伏接入电网后的附加损耗为对象,研究考虑户用光伏发电与配电线路附加损耗的量化关系。首先,对户用光伏接入下附加损耗的变化表征进行理论分析,建立有源低压配电网三相四线制等效电路与数学模型;然后,研究户用光伏不同容量与接入相序下的多类型电能质量扰动情况,建立复合电能质量扰动附加损耗模型;最后,依据典型日的光伏出力功率曲线与附加损耗模型,通过算例分析并验证了所提长时间尺度下户用光伏对配电网附加损耗的量化评估方法的准确性。Quantitative analysis of additional losses in low-voltage distribution networks is one of the necessary ways to achieve energy conservation and loss reduction in power systems,in response to the serious increase in additional losses caused by the disorderly access of household photovoltaics.This paper focuses on the quantitative relationship between the additional losses of household photovoltaic power generation and distribution lines after being connected to the power grid.Firstly,a theoretical analysis is conducted on the changes in characterization of additional losses for household photovoltaic(PV)access.An equivalent circuit and mathematical model are established for active low-voltage distribution networks with three-phase four-wire systems.Secondly,the study investigates the disturbance of multiple types of power quality under different capacities and phase sequences of household PV and establishes a composite power quality disturbance additional loss model.Finally,based on the typical daily PV power output curve and additional loss model,the accuracy of the proposed quantification evaluation method for household PV's additional losses in distribution networks is analyzed and verified through case studies.

关 键 词：户用单相光伏 低压配电网 电能质量问题 附加损耗 长时间尺度 

分 类 号：TM712[电气工程—电力系统及自动化]