基于虚拟回路阻抗的低压台区异常工况分析方法  

Analysis Method for Abnormal Operation Condition in Low-voltage Distribution Station Area Based on Virtual Circuit Impedance

作　　者：葛得辉 华定忠 王齐 黄莉 付峰 李颉[4] GE Dehui;HUA Dingzhong;WANG Qi;HUANG Li;FU Feng;LI Jie(State Grid Corporation of China,Bejjing 100031,China;NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106,China;NARI Technology Co.,Ltd.,Nanjing 211106,China;School of Electrical Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]国家电网有限公司,北京市100031 [2]南瑞集团有限公司(国网电力科学研究院有限公司),江苏省南京市211106 [3]国电南瑞科技股份有限公司,江苏省南京市211106 [4]东南大学电气工程学院,江苏省南京市210096

出　　处：《电力系统自动化》2022年第13期104-111,共8页Automation of Electric Power Systems

基　　金：国家重点研发计划“科技助力经济2020专项”(SQ2020YFF0426410);国家电网公司科技项目(5400-202018421A-0-0-00)。

摘　　要：宽带载波通信技术大幅提升了用电信息采集数据的频度和广度,深入挖掘计量大数据的应用价值是当前研究的热点。首先,文中针对辐射型拓扑结构的低压配电网构建了包含两段式虚拟回路阻抗的电路模型,即用户虚拟干线阻抗与虚拟支线阻抗,并剔除三相不平衡的干扰,采用多元约束线性回归模型实现两类虚拟阻抗的精准计算。然后,进一步深入分析台区拓扑异常、用户窃电和线路异常等几种典型异常运行工况的运行机理,提出台区异常工况的分析方法,形成基于虚拟回路阻抗时序稳定性以及空间相似性的组合诊断策略,有效支撑电网公司开展设备运维和用电检查工作。最后,以中国河北省某供电所为例进行工程应用分析并开展现场核查,验证了所提方法的有效性。Broadband carrier communication technology has greatly increased the frequency and breadth of data collection for electricity consumption information, and in-depth exploration of the application value of metrology big data is a current research hotspot. First, aiming at the low-voltage distribution network with a radial topology, this paper constructs a circuit model with twostage virtual loop impedance, that is, the user′s virtual trunk line impedance and virtual branch line impedance;and achieves accurate calculation of two types of virtual impedances by eliminating the interference of the three-phase imbalance and adopting a multi-constraint linear regression model. Then, the operation mechanism of several typical abnormal operation conditions in the distribution station area is analyzed, such as topology abnormality, electricity theft by users, and line abnormality. And an analysis method for the abnormal operation condition perception of distribution stations is proposed, forming a combination diagnosis strategy based on timing stability of virtual loop impedance and spatial similarity to effectively support the equipment maintenance and power consumption inspection task of the power grid company. Finally, a power supply station in Hebei Province of China is taken as an example, and engineering application analysis and on-site verification are carried out, which fully verify the effectiveness of the proposed method.

关 键 词：虚拟回路阻抗 多元约束线性回归 台区 用户窃电 异常工况 

分 类 号：TM73[电气工程—电力系统及自动化]