中国电机工程学报2026，Vol.46Issue(9)：3578-3592,中插7,16.DOI:10.13334/j.0258-8013.pcsee.250168
构网直流支撑的新能源辐射型汇集系统短路比指标分析
Short-circuit Ratio Indicator for Grid-forming DC-supported Renewable Energy Radiative Integration System
摘要
Abstract
The converter station based on grid-forming control can provide voltage support for the renewable energy AC grid without conventional power supply support and AC main network connection in deserts,gobi,and barren lands of China,but its voltage support capability is constrained by current limiting.In this paper,a calculation method of short circuit ratio and critical short circuit ratio of renewable energy radial AC grid with grid converter providing voltage support is proposed.Firstly,the equivalent grid-connected current of the grid-connected point considering the influence of the injection current of the remaining nodes is derived.Secondly,the calculation of the supporting current of the system with current limiting link for renewable energy is obtained.Then,the calculation method of short-circuit ratio(SCR-I)and critical short circuit ratio(CSCRI)based on current calculation is proposed.By integrating the aforementioned elements,the grid voltage strength evaluation method is developed.Finally,the accuracy and rationality of using SCR-I and CSCRI to evaluate the voltage intensity of AC grid are verified by some examples.关键词
新能源并网/短路比/电压支撑/电流限幅/交流电网强度Key words
renewable energy integration/short circuit ratio/voltage support/current limiting/AC grid strength分类
信息技术与安全科学引用本文复制引用
刘超男,赵成勇..构网直流支撑的新能源辐射型汇集系统短路比指标分析[J].中国电机工程学报,2026,46(9):3578-3592,中插7,16.基金项目
国家重点研发计划项目(2023YFB2405900).National Key R&D Program of China(2023YFB2405900). （2023YFB2405900）
