中国电机工程学报2025，Vol.45Issue(17)：6777-6789,中插15,14.DOI:10.13334/j.0258-8013.pcsee.240256
新能源接入电网短路故障低电压穿越期间静态电压稳定研究
Research on Static Voltage Stability During Low-voltage Ride-through Under Short-circuit Fault Conditions in Renewable Energy Integrated Power Grids
摘要
Abstract
During the steady-state period of low-voltage ride-through in renewable energy integrated power grid with faults,inappropriate active and reactive current injections can lead to system instability,causing static voltage stability issues.This paper extends the normal steady-state static voltage stability analysis method to the low-voltage ride-through period of new energy generator,analyzes its mechanism,and defines the static stability index for short circuit faults.Firstly,considering the low-voltage ride-through control strategy of the renewable energy generator,the critical current value for voltage stability during the low-voltage ride-through period of a single renewable energy source integrated power grid is obtained.A low-voltage ride-through static voltage stability margin index(LTSVSMI)is defined.Difference is compared in static stability characteristics between new energy generators during low-voltage ride-through period and in the normal steady state,and there are significant differences between the two stability limits.Secondly,to calculate the stability index for an asymmetric fault in a single renewable energy integrated power grid,the negative-sequence and zero-sequence networks are treated as additional impedances connected to the fault point,and the impact of asymmetric faults is analyzed.In a multi-source renewable energy power grid,the fault ports are specially treated according to symmetric and asymmetric fault types,and the influence of other renewable energy sources is incorporated into virtual impedances,extending the application of the method to multi-source renewable energy integrated power grids.Finally,a single renewable energy source grid-connected system and a multi-source renewable energy grid-connected system are simulated based on the IEEE 33-node distribution network to validate the correctness of the derived results.关键词
新能源电力系统/低电压穿越/静态电压稳定性Key words
renewable energy power system/low-voltage ride-through/static voltage stability分类
信息技术与安全科学引用本文复制引用
谢德兴,肖仕武..新能源接入电网短路故障低电压穿越期间静态电压稳定研究[J].中国电机工程学报,2025,45(17):6777-6789,中插15,14.基金项目
国网冀北电力公司科技项目(SGTYHT/23-JS-001).State Grid Corporation of China,Hebei North Power Company Technology Project(SGTYHT/23-JS-001). （SGTYHT/23-JS-001）
