高电压技术2026，Vol.52Issue(9)：4113-4123,中插14-中插18,16.DOI:10.13336/j.1003-6520.hve.20250935
桥臂复用型高压直流变压器支路短路故障分析
Internal Branch Short Circuit Fault of High Voltage DC Transformer with Arm Multiplexing
摘要
Abstract
The high-voltage and large-capacity DC transformer is the core equipment supporting large-scale renewable energy transmission.As a forward-looking solution for high-capacity high-voltage DC transformers,the high-voltage DC transformer with arm multiplexing presents a significant technical challenge in revealing its fault characteristics'evolu-tion.To address the issues such as short transient duration of internal branch faults,limited electrical features,and complex coupling paths,this paper establishes an equivalent circuit model for branch short-circuit faults with AC/DC de-coupling and derives the analytical expressions for physical quantities from the fault occurrence to submodule locking.The fault characteristics of branch short-circuit faults are revealed.A comparison is made between the equivalent model and the switch model of the high-voltage DC transformer with arm multiplexing which is built on the basis of MATLAB/Simulink.Simulation results show that the proposed fault analysis method,considering the interaction coupling effects of internal branch faults,reflects the fault evolution of branch short-circuits in the high-voltage DC transformer with arm multiplexing,providing references for subsequent fault feature extraction,accurate fault identification,and rapid protection techniques.关键词
直流输电/大容量高压直流变压器/桥臂复用型高压直流变压器/内部故障/故障暂态建模/故障分析Key words
DC transmission/high-voltage and large-capacity DC transformer/high voltage DC transformer with arm multiplexing/internal fault of DC transformer/fault transient modeling/fault analysis引用本文复制引用
张鸿宇,王丹,毛承雄,唐鹏飞,范若萱,彭星冉..桥臂复用型高压直流变压器支路短路故障分析[J].高电压技术,2026,52(9):4113-4123,中插14-中插18,16.基金项目
国家重点研发计划(2023YFB2407200).Project supported by National Key R&D Program of China(2023YFB2407200). （2023YFB2407200）
