电测与仪表2017，Vol.54Issue(16)：14-19,6.
基于VSC的多端直流环网系统故障分析与定位研究
DC side short-circuit fault analysis and location of multi-terminal DC ring system based on VSC
摘要
Abstract
Compared with the two-terminal DC system, the multi-terminal DC ring system is more reliable and flexible.However, the multi-terminal DC ring system brings more challenges in terms of DC fault analysis and isolation due to the increasing of the fault current loops.This paper firstly provides background on the topology and control method of the DC grid, analyzes the fault characteristics of the DC bus and line, and deduces the mathematical expressions of fault current and voltage.According to the above analysis and with the use of various equipments (current limiting inductor, DC breaker, and DC direction switch), this paper investigates a new fault location and protection strategy based on the fault feather di/dt without using communication between converters.Finally, a three-terminal structure of DC ring network simulation model is established in Matlab/Simulink.The simulation results show that the proposed strategy can quickly identify and isolate fault and ensure the rapid recovery of multi-terminal DC ring system after fault.关键词
电压源换流器/多端直流环网/短路故障/故障分析/故障定位/保护配置Key words
VSC/multi-terminal ring grid/short-circuit fault/fault analysis/fault location/protection configuration分类
信息技术与安全科学引用本文复制引用
许士锦,王毅,景世良,刘婧妍..基于VSC的多端直流环网系统故障分析与定位研究[J].电测与仪表,2017,54(16):14-19,6.基金项目
国家863高技术基金项目(2015AA050101) （2015AA050101）
