基于聚合电流的高比例分布式电源接入配电网短路故障计算与分析  

Calculation and analysis of short-circuit fault of distribution network with high proportion distributed generators based on aggregated current

作　　者：赵舒心 肖仕武 梁伟宸 ZHAO Shuxin;XIAO Shiwu;LIANG Weichen(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China;AVIC Jonhon Optronic Technology Co.,Ltd.,Luoyang 471003,China;State Grid Jibei Electric Power Research Institute,Beijing 100045,China)

机构地区：[1]新能源电力系统全国重点实验室(华北电力大学),北京102206 [2]中航光电科技股份有限公司,河南洛阳471003 [3]国网冀北电力有限公司电力科学研究院,北京100045

出　　处：《电力系统保护与控制》2025年第7期16-26,共11页Power System Protection and Control

基　　金：国家重点研发计划项目资助(2021YFB1600200);国网冀北公司项目资助(52018K230001)。

摘　　要：分布式电源数量多、接入点分散,故障期间输出特性取决于其低电压穿越控制策略,导致推导配电网短路故障电流、电压解析表达式困难,也难以解释故障电流电压变化机理和变化规律。针对这些难点问题,提出了一种基于聚合电流的高比例分布式电源接入配电网短路故障计算与分析方法。首先,该方法根据分布式电源并网位置对测量支路短路电流的不同影响,将分布式电源按照位置分类并聚合,利用道路矩阵形成节点阻抗矩阵进而确定聚合位置。然后,推导基于聚合短路电流的短路故障电流、电压计算的解析表达式。进一步,根据聚合短路电流和解析表达式从机理上分析分布式电源接入对故障电流、电压的影响,探讨故障电流、电压随聚合短路电流的变化规律。最后,通过算例验证了所提故障计算与分析方法的正确性。The large number and dispersed access points of distributed generators(DGs),and the output characteristics during faults depending on their low voltage ride through control strategy,make it difficult to derive analytical expressions of fault current and voltage in the distribution network,as well as explain the mechanism and law of fault current and voltage changes.In order to solve these problems,a short-circuit fault calculation and analysis method of distribution network with high proportion DGs based on aggregated current is proposed.First,DGs are classified and aggregated based on their locations,considering their different influence on the branch short-circuit current.A nodal impedance matrix is then formed by a path matrix to determine the aggregation location.Next,the analytical expressions of short-circuit fault current and voltage calculation based on the aggregated short-circuit current are derived.Furthermore,based on the aggregated short-circuit current and analytical expressions,the impact of DGs connection on fault current and voltage is analyzed from a mechanistic perspective,exploring the variation patterns of fault current and voltage with respect to aggregated short-circuit current.Finally,case studies verify the correctness of the proposed fault calculation and analysis method.

关 键 词：分布式电源 故障分析方法 聚合短路电流 故障规律 

分 类 号：TM721[电气工程—电力系统及自动化] TM711