电力系统保护与控制2026，Vol.54Issue(8)：142-152,11.DOI:10.19783/j.cnki.pspc.251090
混合级联直流输电系统逆变侧LCC换流变故障性涌流影响分析及抑制方案
Analysis and suppression scheme of fault-induced inrush current in the inverter-side LCC converter transformer of a hybrid cascaded HVDC system
摘要
Abstract
The inverter side of a hybrid cascaded HVDC system adopts a cascade structure of a line-commutated converter(LCC)and a modular multilevel converter(MMC).To address the difficulty in identifying the faulted phase when an external fault occurs on the valve side of the LCC converter transformer,an extended differential protection scheme for the converter transformer is proposed.First,the fault-induced inrush current(FIIC)caused by a valve-side single-phase-to-ground(SPG)fault on the LCC converter transformer is analyzed.It is clearly demonstrated that activating the bypass pair of the faulted phase can suppress FIIC,whereas triggering the bypass pair of non-faulted phases will aggravate its development.Second,considering the complex coupling between the LCC and MMC inverters,the adverse effects of FIIC on both LCC and MMC converter transformers are analyzed.To overcome the difficulty in accurately identifying the faulted phase during a valve-side external SPG fault of the LCC converter transformer under existing protection configurations,an extended differential protection scheme is proposed,enabling faulted phase identification and FIIC suppression.Finally,simulations conducted on the PSCAD/EMTDC platform verify the effectiveness of the proposed protection scheme in both faulted phase identification and FIIC suppression.关键词
混合级联/换流变压器/故障性涌流/差动保护/旁通对Key words
hybrid cascaded/converter transformer/fault-induced inrush current/differential protection/bypass pair引用本文复制引用
郑涛,薛雨婷,纪良宸..混合级联直流输电系统逆变侧LCC换流变故障性涌流影响分析及抑制方案[J].电力系统保护与控制,2026,54(8):142-152,11.基金项目
This work is supported by the National Natural Science Foundation of China(No.52377099). 国家自然科学基金项目资助(52377099) （No.52377099）
