电力系统及其自动化学报2026，Vol.38Issue(5)：76-89,14.DOI:10.19635/j.cnki.csu-epsa.001794
不对称故障下构网变流器故障电流解析计算
Analytical Calculation of Fault Current in Grid-forming Converters Under Asymmetric Faults
祝迪 1唐楚杰 1熊凯 1张晋境 1郭力 2贾昊琛2
作者信息
- 1. 湖北清江水电开发有限责任公司,宜昌 443000
- 2. 智能配用电装备与系统全国重点实验室(天津大学),天津 300072
- 折叠
摘要
Abstract
To addresses the challenge that the fault current of grid-forming converters is strongly affected by the cou-pling between control strategies and electromagnetic transients,which causes difficulty in analytical calculation,an an-alytical calculation method for the fault current of grid-forming converters under asymmetric faults is proposed in this pa-per.First,based on the differences in dynamic response speed among the converter's control loops,the mathematical model of fault current is simplified into a fast-slow timescale separation model composed of reactive power-voltage con-trol loop dynamics and fault current dynamics.Then,an analytical expression for internal potential is derived according to the reactive power-voltage control loop,which is further substituted into the positive-sequence component dynamic equation of fault current.The negative-sequence component is subsequently superimposed to yield an analytical expres-sion for the fault current of the grid-forming converter.Compared with the conventional numerical or approximate model-ing methods,the proposed approach can accurately characterize the transient current characteristics of grid-forming con-verters under asymmetric faults,so as to reveal the coupled effects of control parameters,virtual impedance and grid conditions on the amplitude and phase of fault current.The results in this paper provide a theoretical foundation for the design of fault current-limiting strategies and the optimization of engineering parameters.关键词
不对称故障/构网变流器/故障电流解析计算Key words
asymmetric fault/grid-forming converter/analytical calculation of fault current分类
信息技术与安全科学引用本文复制引用
祝迪,唐楚杰,熊凯,张晋境,郭力,贾昊琛..不对称故障下构网变流器故障电流解析计算[J].电力系统及其自动化学报,2026,38(5):76-89,14.
