中国电力2026，Vol.59Issue(1)：84-96,13.DOI:10.11930/j.issn.1004-9649.202508038
计及多种分布式能源的多端直流配电网故障电流计算方法
Fault current calculation method for multi-terminal DC distribution networks considering multiple distributed generation
摘要
Abstract
In DC distribution networks,short-circuit faults can cause the current to rise to several times the normal operating level in an extremely short period,posing severe challenges to system protection and safe operation.The presence of multiple distributed generators(DGs)in DC distribution networks and the diversity of their grid-connected converters as well as the complex coupling relationships make it difficult to analyze fault characteristics and accurately calculate fault currents,which is unfavorable to the design of protection strategies.To address this issue,this paper proposes a fault current calculation model for DC distribution networks with multiple DGs.First,a fault equivalent circuit of the voltage source converter(VSC)is established,and the fault response characteristics of PV Boost converters,distributed wind power machine-side converters(MSC),energy storage dual active bridge(DAB)converters and VSCs are analyzed to construct multi-scenario fault equivalent circuits.Second,proceeding from the multi-stage transient response process of fault current,a fault current calculation model is built,covering the initial steady-state stage before fault,DC bus discharge stage,diode freewheeling stage and steady-state stage after fault.Then,based on the established multi-stage fault current calculation model,the key factors affecting the peak fault current are analyzed.Finally,taking a multi-terminal DC distribution network with multiple DGs as an example,the theoretical calculation results are compared with the Matlab/Simulink simulation results to verify the accuracy of the proposed model.关键词
多端直流配电网/分布式能源/故障等效回路/故障电流计算/峰值电流Key words
multi-terminal DC distribution network/distributed generation/fault equivalent circuit/fault current calculation/peak current引用本文复制引用
JIA Dongli,REN Zhaoying,LIU Keyan,YE Xueshun,LI Yuetao,XU Limei..计及多种分布式能源的多端直流配电网故障电流计算方法[J].中国电力,2026,59(1):84-96,13.基金项目
四川省自然科学基金资助项目(2022NSFSC1913) （2022NSFSC1913）
国家电网公司科技项目(5108-202218280A-2-370-XG). This work is supported by Sichuan Provincial Natural Science Foundation(No.2022NSFSC1913) （5108-202218280A-2-370-XG）
Science and Technology Project of SGCC(No.5108-202218280A-2-370-XG). （No.5108-202218280A-2-370-XG）
