中国电机工程学报2026，Vol.46Issue(10)：3995-4010,中插6,17.DOI:10.13334/j.0258-8013.pcsee.251263
跟网型新能源并网系统最大三相短路电流算法及影响因素研究
Algorithm and Influencing Factors of Maximum Three-phase Short-circuit Current in Grid-following Renewable Energy Grid-connected Systems
摘要
Abstract
This paper addresses the issue of over-evaluation in short-circuit current(SCC)calculations for grid-following renewable energy grid-connected systems.By developing a network decomposition method and deriving analytical expressions for SCC,this paper reveals the influence of renewable energy's initial power output on fault currents.Furthermore,it establishes selection criteria for the equivalent voltage source coefficient when calculating the maximum SCC,and proposes a novel method for determining the maximum three-phase SCC at fault locations.The proposed method overcomes the limitations of conventional algorithms,which rely on predefined initial power assumptions,and eliminates deviations caused by amplitude substitution and worst-case voltage scenarios.As a result,it significantly reduces the bias in existing calculation methods.Using the proposed method,this paper theoretically analyzes the impact of renewable energy integration-both direct and replacement-on SCC contributions.The accuracy of the method is validated through electromagnetic transient simulations,while its scalability is demonstrated on a large-scale power system with 110 000 nodes.Additionally,real fault measurements from the North China Power Grid confirm the method's engineering practicality and superiority over conventional approaches.关键词
跟网型新能源/最大三相短路电流/初始功率/电压系数/计算方法Key words
grid-following renewable energy/maximum three-phase short-circuit current/initial power/voltage coefficient/calculation method分类
信息技术与安全科学引用本文复制引用
徐文佳,万凯遥,孙华东,周勤勇,郑超,韩彬,李亚楼,谭贝斯,张玉红,田鸣鹤..跟网型新能源并网系统最大三相短路电流算法及影响因素研究[J].中国电机工程学报,2026,46(10):3995-4010,中插6,17.基金项目
智能电网国家科技重大专项项目(2030)(2025ZD0807600).Project Supported by Smart-grid National Science and Technology Major Project(2025ZD0807600). （2030）
